playwright/browser_patches/webkit/patches/bootstrap.diff

diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt
index 38ae6ce11a89bb2ca657c58cf82d7e47518a9951..985bc87f8b600346f92c8fe63c16313c63e80400 100644
--- a/Source/JavaScriptCore/CMakeLists.txt
+++ b/Source/JavaScriptCore/CMakeLists.txt
@@ -1180,22 +1180,27 @@ set(JavaScriptCore_INSPECTOR_DOMAINS
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/CSS.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Canvas.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Console.json
+    ${JAVASCRIPTCORE_DIR}/inspector/protocol/Dialog.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/DOM.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/DOMDebugger.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/DOMStorage.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Database.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Debugger.json
+    ${JAVASCRIPTCORE_DIR}/inspector/protocol/Emulation.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/GenericTypes.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Heap.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/IndexedDB.json
+    ${JAVASCRIPTCORE_DIR}/inspector/protocol/Input.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Inspector.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/LayerTree.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Memory.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Network.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Page.json
+    ${JAVASCRIPTCORE_DIR}/inspector/protocol/Playwright.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Recording.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Runtime.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/ScriptProfiler.json
+    ${JAVASCRIPTCORE_DIR}/inspector/protocol/Screencast.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Security.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/ServiceWorker.json
     ${JAVASCRIPTCORE_DIR}/inspector/protocol/Target.json
diff --git a/Source/JavaScriptCore/DerivedSources.make b/Source/JavaScriptCore/DerivedSources.make
index 275a1c1b676e7974d2a8bcce5bba28fc805f8ce3..d5d70175f5df5f1a12fd199136ff9638bceeb3d8 100644
--- a/Source/JavaScriptCore/DerivedSources.make
+++ b/Source/JavaScriptCore/DerivedSources.make
@@ -267,22 +267,27 @@ INSPECTOR_DOMAINS := \
     $(JavaScriptCore)/inspector/protocol/CSS.json \
     $(JavaScriptCore)/inspector/protocol/Canvas.json \
     $(JavaScriptCore)/inspector/protocol/Console.json \
+    $(JavaScriptCore)/inspector/protocol/Dialog.json \
     $(JavaScriptCore)/inspector/protocol/DOM.json \
     $(JavaScriptCore)/inspector/protocol/DOMDebugger.json \
     $(JavaScriptCore)/inspector/protocol/DOMStorage.json \
     $(JavaScriptCore)/inspector/protocol/Database.json \
     $(JavaScriptCore)/inspector/protocol/Debugger.json \
+    $(JavaScriptCore)/inspector/protocol/Emulation.json \
     $(JavaScriptCore)/inspector/protocol/GenericTypes.json \
     $(JavaScriptCore)/inspector/protocol/Heap.json \
     $(JavaScriptCore)/inspector/protocol/IndexedDB.json \
+    $(JavaScriptCore)/inspector/protocol/Input.json \
     $(JavaScriptCore)/inspector/protocol/Inspector.json \
     $(JavaScriptCore)/inspector/protocol/LayerTree.json \
     $(JavaScriptCore)/inspector/protocol/Memory.json \
     $(JavaScriptCore)/inspector/protocol/Network.json \
     $(JavaScriptCore)/inspector/protocol/Page.json \
+    $(JavaScriptCore)/inspector/protocol/Playwright.json \
     $(JavaScriptCore)/inspector/protocol/Recording.json \
     $(JavaScriptCore)/inspector/protocol/Runtime.json \
     $(JavaScriptCore)/inspector/protocol/ScriptProfiler.json \
+    $(JavaScriptCore)/inspector/protocol/Screencast.json \
     $(JavaScriptCore)/inspector/protocol/Security.json \
     $(JavaScriptCore)/inspector/protocol/ServiceWorker.json \
     $(JavaScriptCore)/inspector/protocol/Target.json \
diff --git a/Source/JavaScriptCore/bindings/ScriptValue.cpp b/Source/JavaScriptCore/bindings/ScriptValue.cpp
index 7968b90a73b282df5982256a6edcb2d6e574396e..6cc034017ae9b2f35c9c526633052586db920ee4 100644
--- a/Source/JavaScriptCore/bindings/ScriptValue.cpp
+++ b/Source/JavaScriptCore/bindings/ScriptValue.cpp
@@ -79,7 +79,10 @@ static RefPtr<JSON::Value> jsToInspectorValue(JSGlobalObject* globalObject, JSVa
         PropertyNameArray propertyNames(vm, PropertyNameMode::Strings, PrivateSymbolMode::Exclude);
         object.methodTable(vm)->getOwnPropertyNames(&object, globalObject, propertyNames, EnumerationMode());
         for (auto& name : propertyNames) {
-            auto inspectorValue = jsToInspectorValue(globalObject, object.get(globalObject, name), maxDepth);
+            JSValue childValue = object.get(globalObject, name);
+            if (childValue.isUndefined())
+                continue;
+            auto inspectorValue = jsToInspectorValue(globalObject, childValue, maxDepth);
             if (!inspectorValue)
                 return nullptr;
             inspectorObject->setValue(name.string(), inspectorValue.releaseNonNull());
diff --git a/Source/JavaScriptCore/inspector/IdentifiersFactory.cpp b/Source/JavaScriptCore/inspector/IdentifiersFactory.cpp
index 95cd87b01b15cb8667e57bc5bb51a71f06bc3760..0481fa93227f297be9d9cf000c5a72235956a390 100644
--- a/Source/JavaScriptCore/inspector/IdentifiersFactory.cpp
+++ b/Source/JavaScriptCore/inspector/IdentifiersFactory.cpp
@@ -30,14 +30,21 @@
 namespace Inspector {
 
 namespace {
+static uint64_t s_processID = 0;
 static long s_lastUsedIdentifier = 0;
 }
 
 static String addPrefixToIdentifier(const String& identifier)
 {
-    return makeString("0.", identifier);
+    return makeString(s_processID, ".", identifier);
 }
 
+void IdentifiersFactory::initializeWithProcessID(uint64_t processID) {
+    ASSERT(!s_processID);
+    s_processID = processID;
+}
+
+
 String IdentifiersFactory::createIdentifier()
 {
     return addPrefixToIdentifier(String::number(++s_lastUsedIdentifier));
diff --git a/Source/JavaScriptCore/inspector/IdentifiersFactory.h b/Source/JavaScriptCore/inspector/IdentifiersFactory.h
index eb25aedee4cd9ebe007e06c2515b37ee095b06f4..badf6559595c8377db1089ca3c25008e1be2c8f1 100644
--- a/Source/JavaScriptCore/inspector/IdentifiersFactory.h
+++ b/Source/JavaScriptCore/inspector/IdentifiersFactory.h
@@ -31,6 +31,7 @@ namespace Inspector {
 
 class JS_EXPORT_PRIVATE IdentifiersFactory {
 public:
+    static void initializeWithProcessID(uint64_t);
     static String createIdentifier();
     static String requestId(unsigned long identifier);
 };
diff --git a/Source/JavaScriptCore/inspector/InjectedScript.cpp b/Source/JavaScriptCore/inspector/InjectedScript.cpp
index 65f8d6bf17af27b559d5bef3089757ffa85c54de..d624b031ac0564a2525b923acfb69cee9afbcbfb 100644
--- a/Source/JavaScriptCore/inspector/InjectedScript.cpp
+++ b/Source/JavaScriptCore/inspector/InjectedScript.cpp
@@ -289,6 +289,10 @@ RefPtr<Protocol::Runtime::RemoteObject> InjectedScript::wrapObject(JSC::JSValue
     auto callResult = callFunctionWithEvalEnabled(wrapFunction);
     if (!callResult)
         return nullptr;
+    auto callResultValue = callResult.value();
+    // callResultValue could be missing if the execution was terminated
+    if (!callResultValue)
+        return nullptr;
 
     auto resultValue = toInspectorValue(globalObject(), callResult.value());
     if (!resultValue)
diff --git a/Source/JavaScriptCore/inspector/InjectedScriptSource.js b/Source/JavaScriptCore/inspector/InjectedScriptSource.js
index 48baed6a1b7ffad453379a2f1eb71b8c4925f6c4..aadd4ae30513a87f36355fa4ffcb6ba7b15dd4fc 100644
--- a/Source/JavaScriptCore/inspector/InjectedScriptSource.js
+++ b/Source/JavaScriptCore/inspector/InjectedScriptSource.js
@@ -136,7 +136,7 @@ let InjectedScript = class InjectedScript
             return;
         }
 
-        if (!(promiseObject instanceof Promise)) {
+        if (InjectedScriptHost.internalConstructorName(promiseObject) !== 'Promise') {
             callback("Object with given id is not a Promise");
             return;
         }
diff --git a/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.cpp b/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.cpp
index 033a1b4713352777ee0de5ed53e64f8391f9d74f..fc356dec4b1518547a4217def6a7b5f1d97330fb 100644
--- a/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.cpp
+++ b/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.cpp
@@ -101,7 +101,7 @@ void BackendDispatcher::registerDispatcherForDomain(const String& domain, Supple
     m_dispatchers.set(domain, dispatcher);
 }
 
-void BackendDispatcher::dispatch(const String& message)
+void BackendDispatcher::dispatch(const String& message, Interceptor&& interceptor)
 {
     Ref<BackendDispatcher> protect(*this);
 
@@ -146,6 +146,9 @@ void BackendDispatcher::dispatch(const String& message)
         requestId = *requestIdInt;
     }
 
+    if (interceptor && interceptor(messageObject) == InterceptionResult::Intercepted)
+        return;
+
     {
         // We could be called re-entrantly from a nested run loop, so restore the previous id.
         SetForScope<Optional<long>> scopedRequestId(m_currentRequestId, requestId);
diff --git a/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.h b/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.h
index 8a5efb316e9d09337ada2323dc6f926056a9c2f9..f3dcc8fcc087f474abc88cea837d11ff3e5faeff 100644
--- a/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.h
+++ b/Source/JavaScriptCore/inspector/InspectorBackendDispatcher.h
@@ -84,7 +84,10 @@ public:
     };
 
     void registerDispatcherForDomain(const String& domain, SupplementalBackendDispatcher*);
-    void dispatch(const String& message);
+
+    enum class InterceptionResult { Intercepted, Continue };
+    using Interceptor = WTF::Function<InterceptionResult(const RefPtr<JSON::Object>&)>;
+    void dispatch(const String& message, Interceptor&& interceptor = Interceptor());
 
     // Note that 'unused' is a workaround so the compiler can pick the right sendResponse based on arity.
     // When <http://webkit.org/b/179847> is fixed or this class is renamed for the JSON::Object case,
diff --git a/Source/JavaScriptCore/inspector/InspectorFrontendRouter.cpp b/Source/JavaScriptCore/inspector/InspectorFrontendRouter.cpp
index d408d364f1986983161f9d44efbc8bc6f6898676..1375ce9990f0c63d7e6f33ee62930051d6cd44cb 100644
--- a/Source/JavaScriptCore/inspector/InspectorFrontendRouter.cpp
+++ b/Source/JavaScriptCore/inspector/InspectorFrontendRouter.cpp
@@ -49,7 +49,7 @@ void FrontendRouter::connectFrontend(FrontendChannel& connection)
 void FrontendRouter::disconnectFrontend(FrontendChannel& connection)
 {
     if (!m_connections.contains(&connection)) {
-        ASSERT_NOT_REACHED();
+        ASSERT(m_connections.isEmpty());
         return;
     }
 
diff --git a/Source/JavaScriptCore/inspector/InspectorTarget.cpp b/Source/JavaScriptCore/inspector/InspectorTarget.cpp
index 0cc2127c9c12c2d82dea9550bad73f4ffb99ba24..8ca65cc042d435cbc0e05dcc5c5dfc958eb24f5a 100644
--- a/Source/JavaScriptCore/inspector/InspectorTarget.cpp
+++ b/Source/JavaScriptCore/inspector/InspectorTarget.cpp
@@ -44,6 +44,8 @@ void InspectorTarget::resume()
     ASSERT(m_isPaused);
     m_isPaused = false;
 
+    willResume();
+
     if (m_resumeCallback) {
         m_resumeCallback();
         m_resumeCallback = nullptr;
@@ -52,7 +54,6 @@ void InspectorTarget::resume()
 
 void InspectorTarget::setResumeCallback(WTF::Function<void()>&& callback)
 {
-    ASSERT(!m_resumeCallback);
     m_resumeCallback = WTFMove(callback);
 }
 
diff --git a/Source/JavaScriptCore/inspector/InspectorTarget.h b/Source/JavaScriptCore/inspector/InspectorTarget.h
index 4b95964db4d902b4b7f4b0b4c40afea51654ff2f..966a5927702b65edb343369decafda7fc83eaec7 100644
--- a/Source/JavaScriptCore/inspector/InspectorTarget.h
+++ b/Source/JavaScriptCore/inspector/InspectorTarget.h
@@ -56,8 +56,12 @@ public:
     virtual void connect(FrontendChannel::ConnectionType) = 0;
     virtual void disconnect() = 0;
     virtual void sendMessageToTargetBackend(const String&) = 0;
+    virtual void activate(String& error) { error = "Target cannot be activated"; }
+    virtual void close(String& error, bool /* runBeforeUnload */) { error = "Target cannot be closed"; }
 
 private:
+    virtual void willResume() { }
+
     WTF::Function<void()> m_resumeCallback;
     bool m_isPaused { false };
 };
diff --git a/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.cpp b/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.cpp
index 508eb02ec95c52408384a1e2b77648afd426dd9d..05f483dced4b62ffdd60b0a0447504802e1f5711 100644
--- a/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.cpp
+++ b/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.cpp
@@ -87,6 +87,34 @@ Protocol::ErrorStringOr<void> InspectorTargetAgent::sendMessageToTarget(const St
     return { };
 }
 
+Protocol::ErrorStringOr<void> InspectorTargetAgent::activate(const String& targetId)
+{
+    InspectorTarget* target = m_targets.get(targetId);
+    if (!target)
+        return makeUnexpected("Missing target for given targetId"_s);
+
+    String errorString;
+    target->activate(errorString);
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorTargetAgent::close(const String& targetId,  Optional<bool>&& runBeforeUnload)
+{
+    InspectorTarget* target = m_targets.get(targetId);
+    if (!target)
+        return makeUnexpected("Missing target for given targetId"_s);
+
+    String errorString;
+    target->close(errorString, runBeforeUnload && *runBeforeUnload);
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    return { };
+}
+
 void InspectorTargetAgent::sendMessageFromTargetToFrontend(const String& targetId, const String& message)
 {
     ASSERT_WITH_MESSAGE(m_targets.get(targetId), "Sending a message from an untracked target to the frontend.");
@@ -144,7 +172,17 @@ void InspectorTargetAgent::targetDestroyed(InspectorTarget& target)
     if (!m_isConnected)
         return;
 
-    m_frontendDispatcher->targetDestroyed(target.identifier());
+    m_frontendDispatcher->targetDestroyed(target.identifier(), false);
+}
+
+void InspectorTargetAgent::targetCrashed(InspectorTarget& target)
+{
+    m_targets.remove(target.identifier());
+
+    if (!m_isConnected)
+        return;
+
+    m_frontendDispatcher->targetDestroyed(target.identifier(), true);
 }
 
 void InspectorTargetAgent::didCommitProvisionalTarget(const String& oldTargetID, const String& committedTargetID)
@@ -159,6 +197,18 @@ void InspectorTargetAgent::didCommitProvisionalTarget(const String& oldTargetID,
     m_frontendDispatcher->didCommitProvisionalTarget(oldTargetID, committedTargetID);
 }
 
+void InspectorTargetAgent::ensureConnected(const String& targetID)
+{
+    if (!m_isConnected)
+        return;
+
+    auto* target = m_targets.get(targetID);
+    if (!target)
+        return;
+
+    target->connect(connectionType());
+}
+
 FrontendChannel::ConnectionType InspectorTargetAgent::connectionType() const
 {
     return m_router.hasLocalFrontend() ? Inspector::FrontendChannel::ConnectionType::Local : Inspector::FrontendChannel::ConnectionType::Remote;
diff --git a/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.h b/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.h
index edcd489b76e080827e0741f14bab09f9ea9303d4..25a20c38575604ca1702a23ccf55c2024a07d993 100644
--- a/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.h
+++ b/Source/JavaScriptCore/inspector/agents/InspectorTargetAgent.h
@@ -43,22 +43,28 @@ public:
     ~InspectorTargetAgent();
 
     // InspectorAgentBase
-    void didCreateFrontendAndBackend(FrontendRouter*, BackendDispatcher*);
-    void willDestroyFrontendAndBackend(DisconnectReason);
+    void didCreateFrontendAndBackend(FrontendRouter*, BackendDispatcher*) override;
+    void willDestroyFrontendAndBackend(DisconnectReason) override;
 
     // TargetBackendDispatcherHandler
-    Protocol::ErrorStringOr<void> setPauseOnStart(bool);
-    Protocol::ErrorStringOr<void> resume(const String& targetId);
-    Protocol::ErrorStringOr<void> sendMessageToTarget(const String& targetId, const String& message);
+    Protocol::ErrorStringOr<void> setPauseOnStart(bool) override;
+    Protocol::ErrorStringOr<void> resume(const String& targetId) override;
+    Protocol::ErrorStringOr<void> sendMessageToTarget(const String& targetId, const String& message) override;
+    Protocol::ErrorStringOr<void> activate(const String& targetId) override;
+    Protocol::ErrorStringOr<void> close(const String& targetId, Optional<bool>&& runBeforeUnload) override;
 
     // Target lifecycle.
     void targetCreated(InspectorTarget&);
     void targetDestroyed(InspectorTarget&);
+    void targetCrashed(InspectorTarget&);
     void didCommitProvisionalTarget(const String& oldTargetID, const String& committedTargetID);
+    void ensureConnected(const String& targetID);
 
     // Target messages.
     void sendMessageFromTargetToFrontend(const String& targetId, const String& message);
 
+    bool isConnected() { return m_isConnected; }
+
 private:
     // FrontendChannel
     FrontendChannel::ConnectionType connectionType() const;
diff --git a/Source/JavaScriptCore/inspector/protocol/DOM.json b/Source/JavaScriptCore/inspector/protocol/DOM.json
index 998bc4afe68ec70502a009b7bf5ed1de9758ab31..e50d833cee34a9d0a8349b193ced87dc10d93381 100644
--- a/Source/JavaScriptCore/inspector/protocol/DOM.json
+++ b/Source/JavaScriptCore/inspector/protocol/DOM.json
@@ -79,6 +79,16 @@
                 { "name": "value", "type": "string", "description": "The value that is resolved to with this data binding relationship." }
             ]
         },
+        {
+          "id": "Rect",
+          "type": "object",
+          "properties": [
+            { "name": "x", "type": "integer", "description": "X coordinate" },
+            { "name": "y", "type": "integer", "description": "Y coordinate" },
+            { "name": "width", "type": "integer", "description": "Rectangle width" },
+            { "name": "height", "type": "integer", "description": "Rectangle height" }
+      ]
+        },
         {
             "id": "EventListener",
             "type": "object",
@@ -167,6 +177,16 @@
                 { "name": "borderColor", "$ref": "RGBAColor", "optional": true, "description": "The border highlight fill color (default: transparent)." },
                 { "name": "marginColor", "$ref": "RGBAColor", "optional": true, "description": "The margin highlight fill color (default: transparent)." }
             ]
+        },
+        {
+            "id": "FilePayload",
+            "type": "object",
+            "description": "Data to construct File object.",
+            "properties": [
+                { "name": "name", "type": "string", "description": "File name." },
+                { "name": "type", "type": "string", "description": "File type." },
+                { "name": "data", "type": "string", "description": "Base64-encoded file data." }
+            ]
         }
     ],
     "commands": [
@@ -509,7 +529,9 @@
             "description": "Resolves JavaScript node object for given node id.",
             "targetTypes": ["page"],
             "parameters": [
-                { "name": "nodeId", "$ref": "NodeId", "description": "Id of the node to resolve." },
+                { "name": "nodeId", "$ref": "NodeId", "optional": true, "description": "Id of the node to resolve." },
+                { "name": "objectId", "$ref": "Runtime.RemoteObjectId", "optional": true, "description": "Source element handle." },
+                { "name": "executionContextId", "$ref": "Runtime.ExecutionContextId", "optional": true, "description": "Specifies in which execution context to adopt to." },
                 { "name": "objectGroup", "type": "string", "optional": true, "description": "Symbolic group name that can be used to release multiple objects." }
             ],
             "returns": [
@@ -576,6 +598,45 @@
             "parameters": [
                 { "name": "allow", "type": "boolean" }
             ]
+        },
+        {
+            "name": "describeNode",
+            "description": "Returns node description.",
+            "parameters": [
+                { "name": "objectId", "$ref": "Runtime.RemoteObjectId", "description": "JavaScript object id of the node wrapper." }
+            ],
+            "returns": [
+                { "name": "contentFrameId", "$ref": "Network.FrameId", "optional": true, "description": "Frame ID for frame owner elements." },
+                { "name": "ownerFrameId", "$ref": "Network.FrameId", "optional": true, "description": "ID of the owning frame element." }
+            ]
+        },
+        {
+          "name": "scrollIntoViewIfNeeded",
+          "description": "Scrolls the given rect into view if not already in the viewport.",
+          "parameters": [
+              { "name": "objectId", "$ref": "Runtime.RemoteObjectId", "description": "JavaScript object id of the node wrapper." },
+              { "name": "rect", "$ref": "Rect", "optional": true, "description": "Rect relative to the node's border box, in CSS pixels." }
+          ]
+        },
+        {
+            "name": "getContentQuads",
+            "description": "Returns quads that describe node position on the page. This method\nmight return multiple quads for inline nodes.",
+            "parameters": [
+                { "name": "objectId", "$ref": "Runtime.RemoteObjectId", "description": "JavaScript object id of the node wrapper." }
+            ],
+            "returns": [
+                {
+                    "name": "quads", "type": "array", "items": { "$ref": "Quad" }, "description": "Quads that describe node layout relative to viewport."
+                }
+            ]
+        },
+        {
+            "name": "setInputFiles",
+            "description": "Sets input files for given <input type=file>",
+            "parameters": [
+                { "name": "objectId", "$ref": "Runtime.RemoteObjectId", "description": "Input element handle." },
+                { "name": "files", "type": "array", "items": { "$ref": "FilePayload" }, "description": "Files to set" }
+            ]
         }
     ],
     "events": [
diff --git a/Source/JavaScriptCore/inspector/protocol/Dialog.json b/Source/JavaScriptCore/inspector/protocol/Dialog.json
new file mode 100644
index 0000000000000000000000000000000000000000..79edea03fed4e9be5da96e1275e182a479cb7a0a
--- /dev/null
+++ b/Source/JavaScriptCore/inspector/protocol/Dialog.json
@@ -0,0 +1,36 @@
+{
+    "domain": "Dialog",
+    "description": "Actions and events related to alert boxes.",
+    "availability": ["web"],
+    "types": [
+    ],
+    "commands": [
+        {
+            "name": "enable",
+            "description": "Enables dialog domain notifications."
+        },
+        {
+            "name": "disable",
+            "description": "Disables dialog domain notifications."
+        },
+        {
+            "name": "handleJavaScriptDialog",
+            "description": "Accepts or dismisses a JavaScript initiated dialog (alert, confirm, prompt, or onbeforeunload).",
+            "parameters": [
+                { "name": "accept", "type": "boolean", "description": "Whether to accept or dismiss the dialog."},
+                { "name": "promptText", "optional": true, "type": "string", "description": "The text to enter into the dialog prompt before accepting. Used only if this is a prompt dialog."}
+            ]
+        }
+    ],
+    "events": [
+        {
+            "name": "javascriptDialogOpening",
+            "description": "Fired when a JavaScript initiated dialog (alert, confirm, prompt, or onbeforeunload) is about to open.",
+            "parameters": [
+                { "name": "type", "type": "string", "description": "Dialog type."},
+                { "name": "message", "type": "string", "description": "Message that will be displayed by the dialog."},
+                { "name": "defaultPrompt", "optional": true, "type": "string", "description": "Default dialog prompt."}
+            ]
+        }
+    ]
+}
diff --git a/Source/JavaScriptCore/inspector/protocol/Emulation.json b/Source/JavaScriptCore/inspector/protocol/Emulation.json
new file mode 100644
index 0000000000000000000000000000000000000000..3f28f8e41b39c517369c8ca69415486a75657489
--- /dev/null
+++ b/Source/JavaScriptCore/inspector/protocol/Emulation.json
@@ -0,0 +1,51 @@
+{
+    "domain": "Emulation",
+    "availability": ["web"],
+    "commands": [
+        {
+            "name": "setDeviceMetricsOverride",
+            "description": "Overrides device metrics with provided values.",
+            "async": true,
+            "parameters": [
+                { "name": "width", "type": "integer" },
+                { "name": "height", "type": "integer" },
+                { "name": "deviceScaleFactor", "type": "number" },
+                { "name": "fixedLayout", "type": "boolean" }
+            ]
+        },
+        {
+            "name": "setJavaScriptEnabled",
+            "description": "Allows to disable script execution for the page.",
+            "parameters": [
+                { "name": "enabled", "type": "boolean" }
+            ]
+        },
+        {
+            "name": "setAuthCredentials",
+            "description": "Credentials to use during HTTP authentication.",
+            "parameters": [
+                { "name": "username", "type": "string", "optional": true },
+                { "name": "password", "type": "string", "optional": true }
+            ]
+        },
+        {
+            "name": "setActiveAndFocused",
+            "description": "Makes page focused for test.",
+            "parameters": [
+                { "name": "active", "type": "boolean", "optional": true }
+            ]
+        },
+        {
+            "name": "grantPermissions",
+            "parameters": [
+                { "name": "origin", "type": "string" },
+                { "name": "permissions", "type": "array", "items": { "type": "string" } }
+            ],
+            "description": "Overrides the permissions."
+        },
+        {
+            "name": "resetPermissions",
+            "description": "Clears permission overrides."
+        }
+    ]
+}
diff --git a/Source/JavaScriptCore/inspector/protocol/Input.json b/Source/JavaScriptCore/inspector/protocol/Input.json
new file mode 100644
index 0000000000000000000000000000000000000000..587287d52fde2735cbae34a27a0f673b7e38e1a7
--- /dev/null
+++ b/Source/JavaScriptCore/inspector/protocol/Input.json
@@ -0,0 +1,188 @@
+{
+    "domain": "Input",
+    "availability": ["web"],
+    "types": [
+        {
+            "id": "TimeSinceEpoch",
+            "description": "UTC time in seconds, counted from January 1, 1970.",
+            "type": "number"
+        }
+    ],
+    "commands": [
+        {
+            "name": "dispatchKeyEvent",
+            "description": "Dispatches a key event to the page.",
+            "async": true,
+            "parameters": [
+                {
+                    "name": "type",
+                    "description": "Type of the key event.",
+                    "type": "string",
+                    "enum": [
+                        "keyDown",
+                        "keyUp"
+                    ]
+                },
+                {
+                    "name": "modifiers",
+                    "description": "Bit field representing pressed modifier keys. (default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "text",
+                    "description": "Text as generated by processing a virtual key code with a keyboard layout. Not needed for\nfor `keyUp` and `rawKeyDown` events (default: \"\")",
+                    "optional": true,
+                    "type": "string"
+                },
+                {
+                    "name": "unmodifiedText",
+                    "description": "Text that would have been generated by the keyboard if no modifiers were pressed (except for\nshift). Useful for shortcut (accelerator) key handling (default: \"\").",
+                    "optional": true,
+                    "type": "string"
+                },
+                {
+                    "name": "code",
+                    "description": "Unique DOM defined string value for each physical key (e.g., 'KeyA') (default: \"\").",
+                    "optional": true,
+                    "type": "string"
+                },
+                {
+                    "name": "key",
+                    "description": "Unique DOM defined string value describing the meaning of the key in the context of active\nmodifiers, keyboard layout, etc (e.g., 'AltGr') (default: \"\").",
+                    "optional": true,
+                    "type": "string"
+                },
+                {
+                    "name": "windowsVirtualKeyCode",
+                    "description": "Windows virtual key code (default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "nativeVirtualKeyCode",
+                    "description": "Native virtual key code (default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "autoRepeat",
+                    "description": "Whether the event was generated from auto repeat (default: false).",
+                    "optional": true,
+                    "type": "boolean"
+                },
+                {
+                    "name": "isKeypad",
+                    "description": "Whether the event was generated from the keypad (default: false).",
+                    "optional": true,
+                    "type": "boolean"
+                },
+                {
+                    "name": "isSystemKey",
+                    "description": "Whether the event was a system key event (default: false).",
+                    "optional": true,
+                    "type": "boolean"
+                },
+                {
+                    "name": "macCommands",
+                    "description": "Mac editing commands associated with this key",
+                    "type": "array",
+                    "optional": true,
+                    "items": {
+                      "type": "string"
+                    }
+                }
+            ]
+        },
+        {
+            "name": "dispatchMouseEvent",
+            "description": "Dispatches a mouse event to the page.",
+            "async": true,
+            "parameters": [
+                {
+                    "name": "type",
+                    "description": "Type of the mouse event.",
+                    "type": "string",
+                    "enum": [ "move", "down", "up", "wheel"]
+                },
+                {
+                    "name": "x",
+                    "description": "X coordinate of the event relative to the main frame's viewport in CSS pixels.",
+                    "type": "integer"
+                },
+                {
+                    "name": "y",
+                    "description": "Y coordinate of the event relative to the main frame's viewport in CSS pixels. 0 refers to\nthe top of the viewport and Y increases as it proceeds towards the bottom of the viewport.",
+                    "type": "integer"
+                },
+                {
+                    "name": "modifiers",
+                    "description": "Bit field representing pressed modifier keys. Alt=1, Ctrl=2, Meta/Command=4, Shift=8\n(default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "button",
+                    "description": "Mouse button (default: \"none\").",
+                    "optional": true,
+                    "type": "string",
+                    "enum": [
+                        "none",
+                        "left",
+                        "middle",
+                        "right",
+                        "back",
+                        "forward"
+                    ]
+                },
+                {
+                    "name": "buttons",
+                    "description": "A number indicating which buttons are pressed on the mouse when a mouse event is triggered.\nLeft=1, Right=2, Middle=4, Back=8, Forward=16, None=0.",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "clickCount",
+                    "description": "Number of times the mouse button was clicked (default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "deltaX",
+                    "description": "X delta in CSS pixels for mouse wheel event (default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                },
+                {
+                    "name": "deltaY",
+                    "description": "Y delta in CSS pixels for mouse wheel event (default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                }
+            ]
+        },
+        {
+            "name": "dispatchTapEvent",
+            "description": "Dispatches a tap event to the page.",
+            "async": true,
+            "parameters": [
+                {
+                    "name": "x",
+                    "description": "X coordinate of the event relative to the main frame's viewport in CSS pixels.",
+                    "type": "integer"
+                },
+                {
+                    "name": "y",
+                    "description": "Y coordinate of the event relative to the main frame's viewport in CSS pixels. 0 refers to\nthe top of the viewport and Y increases as it proceeds towards the bottom of the viewport.",
+                    "type": "integer"
+                },
+                {
+                    "name": "modifiers",
+                    "description": "Bit field representing pressed modifier keys. Alt=1, Ctrl=2, Meta/Command=4, Shift=8\n(default: 0).",
+                    "optional": true,
+                    "type": "integer"
+                }
+            ]
+        }
+    ]
+}
diff --git a/Source/JavaScriptCore/inspector/protocol/Network.json b/Source/JavaScriptCore/inspector/protocol/Network.json
index 65ab2092b0ffd0ead3da1ddccd398d4f4179f51a..2d9ef40a20df819193c9a5867fbf6f8f8bf46b48 100644
--- a/Source/JavaScriptCore/inspector/protocol/Network.json
+++ b/Source/JavaScriptCore/inspector/protocol/Network.json
@@ -321,6 +321,13 @@
                 { "name": "requestId", "$ref": "RequestId", "description": "Identifier for the intercepted Network request to fail." },
                 { "name": "errorType", "$ref": "ResourceErrorType", "description": "Deliver error reason for the request failure." }
             ]
+        },
+        {
+            "name": "setEmulateOfflineState",
+            "description": "Emulate offline state overriding the actual state.",
+            "parameters": [
+                { "name": "offline", "type": "boolean", "description": "True to emulate offline." }
+            ]
         }
     ],
     "events": [
diff --git a/Source/JavaScriptCore/inspector/protocol/Page.json b/Source/JavaScriptCore/inspector/protocol/Page.json
index db52479a72d459be23d4d8d080c0ed15ea9fc4c0..b77bec0ab30e8562ef16fa0b01a68ef7501a62eb 100644
--- a/Source/JavaScriptCore/inspector/protocol/Page.json
+++ b/Source/JavaScriptCore/inspector/protocol/Page.json
@@ -27,7 +27,7 @@
         {
             "id": "ResourceType",
             "type": "string",
-            "enum": ["Document", "StyleSheet", "Image", "Font", "Script", "XHR", "Fetch", "Ping", "Beacon", "WebSocket", "Other"],
+            "enum": ["Document", "StyleSheet", "Image", "Font", "Script", "XHR", "Fetch", "Ping", "Beacon", "WebSocket", "EventSource", "Other"],
             "description": "Resource type as it was perceived by the rendering engine."
         },
         {
@@ -112,6 +112,41 @@
                 { "name": "secure", "type": "boolean", "description": "True if cookie is secure." },
                 { "name": "sameSite", "$ref": "CookieSameSitePolicy", "description": "Cookie Same-Site policy." }
             ]
+        },
+        {
+            "id": "AXNode",
+            "type": "object",
+            "description": "Accessibility Node",
+            "properties": [
+                { "name": "role", "type": "string", "description": "The role."},
+                { "name": "name", "type": "string","optional": true, "description": "A human readable name for the node."},
+                { "name": "value", "type": "any", "optional": true, "description": "The current value of the node."},
+                { "name": "description", "type": "string", "optional": true, "description": "An additional human readable description of the node."},
+                { "name": "keyshortcuts", "type": "string", "optional": true, "description": "Keyboard shortcuts associated with this node."},
+                { "name": "roledescription", "type": "string", "optional": true, "description": "A human readable alternative to the role."},
+                { "name": "valuetext", "type": "string", "optional": true, "description": "A description of the current value."},
+                { "name": "disabled", "type": "boolean", "optional": true, "description": "Whether the node is disabled."},
+                { "name": "expanded", "type": "boolean", "optional": true, "description": "Whether the node is expanded or collapsed."},
+                { "name": "focused", "type": "boolean", "optional": true, "description": "Whether the node is focused."},
+                { "name": "modal", "type": "boolean", "optional": true, "description": "Whether the node is modal."},
+                { "name": "multiline", "type": "boolean", "optional": true, "description": "Whether the node text input supports multiline."},
+                { "name": "multiselectable", "type": "boolean", "optional": true, "description": "Whether more than one child can be selected."},
+                { "name": "readonly", "type": "boolean", "optional": true, "description": "Whether the node is read only."},
+                { "name": "required", "type": "boolean", "optional": true, "description": "Whether the node is required."},
+                { "name": "selected", "type": "boolean", "optional": true, "description": "Whether the node is selected in its parent node."},
+                { "name": "checked", "type": "string", "optional": true, "enum": ["true", "false", "mixed"], "description": "Whether the checkbox is checked, or \"mixed\"."},
+                { "name": "pressed", "type": "string", "optional": true, "enum": ["true", "false", "mixed"], "description": "Whether the toggle button is checked, or \"mixed\"."},
+                { "name": "level", "type": "integer", "optional": true, "description": "The level of a heading."},
+                { "name": "valuemin", "type": "number", "optional": true, "description": "The minimum value in a node."},
+                { "name": "valuemax", "type": "number", "optional": true, "description": "The maximum value in a node."},
+                { "name": "autocomplete", "type": "string", "optional": true, "description": "What kind of autocomplete is supported by a control."},
+                { "name": "haspopup", "type": "string", "optional": true, "description": "What kind of popup is currently being shown for a node."},
+                { "name": "invalid", "type": "string", "optional": true, "enum": ["true", "false", "grammar", "spelling"], "description": "Whether and in what way this node's value is invalid."},
+                { "name": "orientation", "type": "string", "optional": true, "description": "Whether the node is oriented horizontally or vertically."},
+                { "name": "focusable", "type": "boolean", "optional": true, "description": "Whether the node is focusable."},
+                { "name": "children", "type": "array", "optional": true, "items": { "$ref": "AXNode"}, "description": "Child AXNodes of this node, if any."},
+                { "name": "found", "type": "boolean", "optional": true, "description": "True if this AXNode corresponds with the ObjectId passed into acessibilitySnapshot."}
+            ]
         }
     ],
     "commands": [
@@ -131,6 +166,14 @@
                 { "name": "revalidateAllResources", "type": "boolean", "optional": true, "description": "If true, all cached subresources will be revalidated when the main resource loads. Otherwise, only expired cached subresources will be revalidated (the default behavior for most WebKit clients)." }
             ]
         },
+        {
+            "name": "goBack",
+            "description": "Goes back in the history."
+        },
+        {
+            "name": "goForward",
+            "description": "Goes forward in the history."
+        },
         {
             "name": "navigate",
             "description": "Navigates current page to the given URL.",
@@ -270,6 +313,20 @@
                 { "name": "appearance", "$ref": "Appearance", "optional": true }
             ]
         },
+        {
+            "name": "setTimeZone",
+            "description": "Enables time zone emulation.",
+            "parameters": [
+                { "name": "timeZone", "type": "string", "optional": true }
+            ]
+        },
+        {
+            "name": "setTouchEmulationEnabled",
+            "description": "Enables touch events on platforms that lack them.",
+            "parameters": [
+                {"name": "enabled", "type": "boolean", "description": "Whether touch should be enabled."}
+            ]
+        },
         {
             "name": "snapshotNode",
             "description": "Capture a snapshot of the specified node that does not include unrelated layers.",
@@ -308,12 +365,67 @@
         {
             "name": "setScreenSizeOverride",
             "description": "Overrides screen size exposed to DOM and used in media queries for testing with provided values.",
-            "condition": "!(defined(WTF_PLATFORM_COCOA) && WTF_PLATFORM_COCOA)",
             "targetTypes": ["page"],
             "parameters": [
                 { "name": "width", "type": "integer", "description": "Screen width", "optional": true },
                 { "name": "height", "type": "integer", "description": "Screen height", "optional": true }
             ]
+        },
+        {
+            "name": "insertText",
+            "description": "Insert text into the current selection of the page.",
+            "parameters": [
+                { "name": "text", "type": "string", "description": "Text to insert." }
+            ]
+        },
+        {
+            "name": "accessibilitySnapshot",
+            "description": "Serializes and returns all of the accessibility nodes of the page.",
+            "parameters": [
+                { "name": "objectId", "type": "string", "optional": true, "description": "Object Id of a node to find in the accessibility tree."}
+            ],
+            "returns": [
+                { "name": "axNode", "$ref": "AXNode", "description": "The root AXNode."}
+            ]
+        },
+        {
+            "name": "setInterceptFileChooserDialog",
+            "description": "Intercepts file chooser dialog",
+            "parameters": [
+                { "name": "enabled", "type": "boolean", "description": "True to enable." }
+            ]
+        },
+        {
+            "name": "setDefaultBackgroundColorOverride",
+            "description": "Sets or clears an override of the default background color of the frame. This override is used if the content does not specify one.",
+            "parameters": [
+                { "name": "color", "$ref": "DOM.RGBAColor", "optional": true, "description": "RGBA of the default background color. If not specified, any existing override will be cleared." }
+            ]
+        },
+        {
+            "name": "createUserWorld",
+            "description": "Creates an user world for every loaded frame.",
+            "parameters": [
+                { "name": "name", "type": "string", "description": "Isolated world name, will be used as an execution context name." }
+            ]
+        },
+        {
+            "name": "setBypassCSP",
+            "description": "Enable page Content Security Policy by-passing.",
+            "parameters": [
+                { "name": "enabled", "type": "boolean", "description": "Whether to bypass page CSP." }
+            ]
+        },
+        {
+            "name": "crash",
+            "description": "Crashes the page process"
+        },
+        {
+            "name": "setOrientationOverride",
+            "description": "Overrides window.orientation with provided value.",
+            "parameters": [
+                { "name": "angle", "type": "integer", "optional": true }
+            ]
         }
     ],
     "events": [
@@ -321,14 +433,16 @@
             "name": "domContentEventFired",
             "targetTypes": ["page"],
             "parameters": [
-                { "name": "timestamp", "type": "number" }
+                { "name": "timestamp", "type": "number" },
+                { "name": "frameId", "$ref": "Network.FrameId", "description": "Id of the frame that has fired DOMContentLoaded event." }
             ]
         },
         {
             "name": "loadEventFired",
             "targetTypes": ["page"],
             "parameters": [
-                { "name": "timestamp", "type": "number" }
+              { "name": "timestamp", "type": "number" },
+              { "name": "frameId", "$ref": "Network.FrameId", "description": "Id of the frame that has fired load event." }
             ]
         },
         {
@@ -338,6 +452,14 @@
                 { "name": "frame", "$ref": "Frame", "description": "Frame object." }
             ]
         },
+        {
+          "name": "frameAttached",
+          "description": "Fired when frame has been attached to its parent.",
+          "parameters": [
+              { "name": "frameId", "$ref": "Network.FrameId", "description": "Id of the frame that has been detached." },
+              { "name": "parentFrameId", "$ref": "Network.FrameId", "optional": true, "description": "Parent frame id if non-root." }
+          ]
+        },
         {
             "name": "frameDetached",
             "description": "Fired when frame has been detached from its parent.",
@@ -377,6 +499,22 @@
                 { "name": "frameId", "$ref": "Network.FrameId", "description": "Id of the frame that has cleared its scheduled navigation." }
             ]
         },
+        {
+            "name": "navigatedWithinDocument",
+            "description": "Fired when same-document navigation happens, e.g. due to history API usage or anchor navigation.",
+            "parameters": [
+                {
+                    "name": "frameId",
+                    "description": "Id of the frame.",
+                    "$ref": "Network.FrameId"
+                },
+                {
+                    "name": "url",
+                    "description": "Frame's new url.",
+                    "type": "string"
+                }
+            ]
+        },
         {
             "name": "defaultAppearanceDidChange",
             "description": "Fired when page's default appearance changes, even if there is a forced appearance.",
@@ -385,6 +523,28 @@
             "parameters": [
                 { "name": "appearance", "$ref": "Appearance", "description": "Name of the appearance that is active (not considering any forced appearance.)" }
             ]
+        },
+        {
+          "name": "willRequestOpenWindow",
+          "description": "Fired when page tries to open a new window.",
+          "parameters": [
+              { "name": "url", "type": "string" }
+          ]
+        },
+        {
+          "name": "didRequestOpenWindow",
+          "description": "Fired after page did try to open a new window.",
+          "parameters": [
+              { "name": "opened", "type": "boolean" }
+          ]
+        },
+        {
+            "name": "fileChooserOpened",
+            "description": "Fired when the page shows file chooser for it's <input type=file>.",
+            "parameters": [
+                { "name": "frameId", "$ref": "Network.FrameId", "description": "Frame where file chooser is opened." },
+                { "name": "element", "$ref": "Runtime.RemoteObject", "description": "Input element." }
+            ]
         }
     ]
 }
diff --git a/Source/JavaScriptCore/inspector/protocol/Playwright.json b/Source/JavaScriptCore/inspector/protocol/Playwright.json
new file mode 100644
index 0000000000000000000000000000000000000000..ce69bc6a10b49460c73110e54b2936afe5dd4ebf
--- /dev/null
+++ b/Source/JavaScriptCore/inspector/protocol/Playwright.json
@@ -0,0 +1,244 @@
+{
+    "domain": "Playwright",
+    "availability": ["web"],
+    "types": [
+        {
+            "id": "ContextID",
+            "type": "string",
+            "description": "Id of Browser context."
+        },
+        {
+            "id": "PageProxyID",
+            "type": "string",
+            "description": "Id of WebPageProxy."
+        },
+        {
+            "id": "CookieSameSitePolicy",
+            "type": "string",
+            "enum": ["None", "Lax", "Strict"],
+            "description": "Same-Site policy of a cookie."
+        },
+        {
+            "id": "Cookie",
+            "type": "object",
+            "description": "Cookie object",
+            "properties": [
+                { "name": "name", "type": "string", "description": "Cookie name." },
+                { "name": "value", "type": "string", "description": "Cookie value." },
+                { "name": "domain", "type": "string", "description": "Cookie domain." },
+                { "name": "path", "type": "string", "description": "Cookie path." },
+                { "name": "expires", "type": "number", "description": "Cookie expires." },
+                { "name": "httpOnly", "type": "boolean", "description": "True if cookie is http-only." },
+                { "name": "secure", "type": "boolean", "description": "True if cookie is secure." },
+                { "name": "session", "type": "boolean", "description": "True if cookie is session cookie." },
+                { "name": "sameSite", "$ref": "CookieSameSitePolicy", "description": "Cookie Same-Site policy." }
+            ]
+        },
+        {
+            "id": "SetCookieParam",
+            "type": "object",
+            "description": "Cookie object",
+            "properties": [
+                { "name": "name", "type": "string", "description": "Cookie name." },
+                { "name": "value", "type": "string", "description": "Cookie value." },
+                { "name": "domain", "type": "string", "description": "Cookie domain." },
+                { "name": "path", "type": "string", "description": "Cookie path." },
+                { "name": "expires", "type": "number", "optional": true, "description": "Cookie expires." },
+                { "name": "httpOnly", "type": "boolean", "optional": true, "description": "True if cookie is http-only." },
+                { "name": "secure", "type": "boolean", "optional": true, "description": "True if cookie is secure." },
+                { "name": "session", "type": "boolean", "optional": true, "description": "True if cookie is session cookie." },
+                { "name": "sameSite", "$ref": "CookieSameSitePolicy", "optional": true, "description": "Cookie Same-Site policy." }
+            ]
+        },
+        {
+            "id": "Geolocation",
+            "type": "object",
+            "description": "Geolocation",
+            "properties": [
+                { "name": "timestamp", "type": "number", "description": "Mock latitude" },
+                { "name": "latitude", "type": "number", "description": "Mock latitude" },
+                { "name": "longitude", "type": "number", "description": "Mock longitude" },
+                { "name": "accuracy", "type": "number", "description": "Mock accuracy" }
+            ]
+        }
+    ],
+    "commands": [
+        {
+            "name": "enable"
+        },
+        {
+            "name": "disable"
+        },
+        {
+            "name": "close",
+            "async": true,
+            "description": "Close browser."
+        },
+        {
+            "name": "createContext",
+            "description": "Creates new ephemeral browser context.",
+            "parameters": [
+                { "name": "proxyServer", "type": "string", "optional": true, "description": "Proxy server, similar to the one passed to --proxy-server" },
+                { "name": "proxyBypassList", "type": "string", "optional": true, "description": "Proxy bypass list, similar to the one passed to --proxy-bypass-list" }
+            ],
+            "returns": [
+                { "name": "browserContextId", "$ref": "ContextID", "description": "Unique identifier of the context." }
+            ]
+        },
+        {
+            "name": "deleteContext",
+            "async": true,
+            "description": "Deletes browser context previously created with createContect. The command will automatically close all pages that use the context.",
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "description": "Identifier of the context to delete." }
+            ]
+        },
+        {
+            "name": "createPage",
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "JSON Inspector Protocol message (command) to be dispatched on the backend." }
+            ],
+            "returns": [
+                { "name": "pageProxyId", "$ref": "PageProxyID", "description": "Unique identifier of the page proxy." }
+            ]
+        },
+        {
+            "name": "navigate",
+            "async": true,
+            "description": "Navigates current page to the given URL.",
+            "parameters": [
+                { "name": "url", "type": "string", "description": "URL to navigate the page to." },
+                { "name": "pageProxyId", "$ref": "PageProxyID", "description": "Unique identifier of the page proxy." },
+                { "name": "frameId", "$ref": "Network.FrameId", "optional": true, "description": "Id of the frame to navigate."},
+                { "name": "referrer", "type": "string", "optional": true, "description": "Referrer URL." }
+            ],
+            "returns": [
+                { "name": "loaderId", "$ref": "Network.LoaderId", "optional": true, "description": "Identifier of the loader associated with the navigation." }
+            ]
+        },
+        {
+            "name": "setIgnoreCertificateErrors",
+            "description": "Change whether all certificate errors should be ignored.",
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." },
+                { "name": "ignore", "type": "boolean" }
+            ]
+        },
+        {
+            "name": "getAllCookies",
+            "description": "Returns all cookies in the given browser context.",
+            "async": true,
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." }
+            ],
+            "returns": [
+                { "name": "cookies", "type": "array", "items": { "$ref": "Cookie" }, "description": "Cookies." }
+            ]
+        },
+        {
+            "name": "setCookies",
+            "description": "Sets cookies in the given browser context.",
+            "async": true,
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." },
+                { "name": "cookies", "type": "array", "items": { "$ref": "SetCookieParam" }, "description": "Cookies." }
+            ]
+        },
+        {
+            "name": "deleteAllCookies",
+            "description": "Deletes cookies in the given browser context.",
+            "async": true,
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." }
+            ]
+        },
+        {
+            "name": "setGeolocationOverride",
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." },
+                { "name": "geolocation", "$ref": "Geolocation", "optional": true, "description": "Geolocation to set, if missing emulates position unavailable." }
+            ],
+            "description": "Overrides the geolocation position or error."
+        },
+        {
+            "name": "setLanguages",
+            "description": "Allows to set locale language for context.",
+            "parameters": [
+                { "name": "languages", "type": "array", "items": { "type": "string" } },
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." }
+            ]
+        },
+        {
+            "name": "setDownloadBehavior",
+            "description": "Allows to override download behavior.",
+            "parameters": [
+                { "name": "behavior", "optional": true, "type": "string", "enum": ["allow", "deny"] },
+                { "name": "downloadPath", "optional": true, "type": "string" },
+                { "name": "browserContextId", "$ref": "ContextID", "optional": true, "description": "Browser context id." }
+            ]
+        }
+    ],
+    "events": [
+        {
+            "name": "pageProxyCreated",
+            "parameters": [
+                { "name": "browserContextId", "$ref": "ContextID", "description": "Unique identifier of the context." },
+                { "name": "pageProxyId", "$ref": "PageProxyID" },
+                { "name": "openerId", "$ref": "PageProxyID", "optional": true, "description": "Unique identifier of the opening page. Only set for pages created by window.open()." }
+            ]
+        },
+        {
+            "name": "pageProxyDestroyed",
+            "parameters": [
+                { "name": "pageProxyId", "$ref": "PageProxyID" }
+            ]
+        },
+        {
+            "name": "provisionalLoadFailed",
+            "description": "Fired when provisional load fails.",
+            "parameters": [
+                { "name": "pageProxyId", "$ref": "PageProxyID", "description": "Unique identifier of the page proxy." },
+                { "name": "loaderId", "$ref": "Network.LoaderId", "description": "Identifier of the loader associated with the navigation." },
+                { "name": "error", "type": "string", "description": "Localized error string." }
+            ]
+        },
+        {
+          "name": "windowOpen",
+          "description": "Fired when page opens a new window.",
+          "parameters": [
+              { "name": "pageProxyId", "$ref": "PageProxyID", "description": "Unique identifier of the page proxy." },
+              { "name": "url", "type": "string" },
+              { "name": "windowFeatures", "type": "array", "items": { "type": "string" } }
+          ]
+        },
+        {
+            "name": "downloadCreated",
+            "parameters": [
+                { "name": "pageProxyId", "$ref": "PageProxyID", "description": "Unique identifier of the page proxy." },
+                { "name": "frameId", "$ref": "Network.FrameId", "description": "Unique identifier of the originating frame." },
+                { "name": "uuid", "type": "string" },
+                { "name": "url", "type": "string" }
+            ]
+        },
+        {
+            "name": "downloadFilenameSuggested",
+            "parameters": [
+                { "name": "uuid", "type": "string" },
+                { "name": "suggestedFilename", "type": "string" }
+            ]
+        },
+        {
+            "name": "downloadFinished",
+            "parameters": [
+                { "name": "uuid", "type": "string" },
+                { "name": "error", "type": "string" }
+            ]
+        },
+        {
+            "name": "screencastFinished",
+            "parameters": [
+                { "name": "screencastId", "$ref": "Screencast.ScreencastId", "description": "Unique identifier of the screencast." }
+            ]
+        }
+    ]
+}
diff --git a/Source/JavaScriptCore/inspector/protocol/Screencast.json b/Source/JavaScriptCore/inspector/protocol/Screencast.json
new file mode 100644
index 0000000000000000000000000000000000000000..a51b42b2a2b575927509e11dc7241ab6f203c104
--- /dev/null
+++ b/Source/JavaScriptCore/inspector/protocol/Screencast.json
@@ -0,0 +1,31 @@
+{
+    "domain": "Screencast",
+    "availability": ["web"],
+    "types": [
+        {
+            "id": "ScreencastId",
+            "type": "string",
+            "description": "Unique identifier of the screencast."
+        }
+    ],
+    "commands": [
+        {
+            "name": "start",
+            "description": "Starts recoring video to speified file.",
+            "parameters": [
+                { "name": "file", "type": "string", "description": "Output file location." },
+                { "name": "width", "type": "integer" },
+                { "name": "height", "type": "integer" },
+                { "name": "scale", "type": "number", "optional": true }
+            ],
+            "returns": [
+                { "name": "screencastId", "$ref": "ScreencastId", "description": "Unique identifier of the screencast." }
+            ]
+        },
+        {
+            "name": "stop",
+            "async": true,
+            "description": "Stops recoding video. Returns after the file has been closed."
+        }
+    ]
+}
diff --git a/Source/JavaScriptCore/inspector/protocol/Target.json b/Source/JavaScriptCore/inspector/protocol/Target.json
index 52920cded24a9c6b0ef6fb4e518664955db4f9fa..bbbabc4e7259088b9404e8cc07eecd6f45077da0 100644
--- a/Source/JavaScriptCore/inspector/protocol/Target.json
+++ b/Source/JavaScriptCore/inspector/protocol/Target.json
@@ -10,7 +10,7 @@
             "properties": [
                 { "name": "targetId", "type": "string", "description": "Unique identifier for the target." },
                 { "name": "type", "type": "string", "enum": ["page", "service-worker", "worker"] },
-                { "name": "isProvisional", "type": "boolean", "optional": true, "description": "Whether this is a provisional page target." },
+                { "name": "isProvisional", "type": "boolean", "optional": true, "description": "True value indicates that this is a provisional page target i.e. Such target may be created when current page starts cross-origin navigation. Eventually each provisional target is either committed and swaps with the current target or gets destroyed, e.g. in case of load request failure." },
                 { "name": "isPaused", "type": "boolean", "optional": true, "description": "Whether the target is paused on start and has to be explicitely resumed by inspector." }
             ]
         }
@@ -37,6 +37,21 @@
                 { "name": "targetId", "type": "string" },
                 { "name": "message", "type": "string", "description": "JSON Inspector Protocol message (command) to be dispatched on the backend." }
             ]
+        },
+        {
+            "name": "activate",
+            "description": "Reveals the target on screen.",
+            "parameters": [
+                { "name": "targetId", "type": "string" }
+            ]
+        },
+        {
+            "name": "close",
+            "description": "Closes the target.",
+            "parameters": [
+                { "name": "targetId", "type": "string" },
+                { "name": "runBeforeUnload", "type": "boolean", "optional": true }
+            ]
         }
     ],
     "events": [
@@ -49,7 +64,8 @@
         {
             "name": "targetDestroyed",
             "parameters": [
-                { "name": "targetId", "type": "string" }
+                { "name": "targetId", "type": "string" },
+                { "name": "crashed", "type": "boolean" }
             ]
         },
         {
diff --git a/Source/JavaScriptCore/inspector/protocol/Worker.json b/Source/JavaScriptCore/inspector/protocol/Worker.json
index 638612413466efc87b737e8a81042ed07ca12703..6f9e518ff0bfa2a6228675d25b6b785f1ed3022a 100644
--- a/Source/JavaScriptCore/inspector/protocol/Worker.json
+++ b/Source/JavaScriptCore/inspector/protocol/Worker.json
@@ -16,7 +16,7 @@
             "description": "Sent after the frontend has sent all initialization messages and can resume this worker. This command is required to allow execution in the worker.",
             "parameters": [
                 { "name": "workerId", "type": "string" }
-            ]            
+            ]
         },
         {
             "name": "sendMessageToWorker",
@@ -33,7 +33,8 @@
             "parameters": [
                 { "name": "workerId", "type": "string" },
                 { "name": "url", "type": "string" },
-                { "name": "name", "type": "string" }
+                { "name": "name", "type": "string" },
+                { "name": "frameId", "$ref": "Network.FrameId", "description": "Id of the frame this worker belongs to." }
             ]
         },
         {
diff --git a/Source/JavaScriptCore/runtime/DateConversion.cpp b/Source/JavaScriptCore/runtime/DateConversion.cpp
index 955756ba405f400970610f9a68c7ed42a67cb015..1520c0a1475a90de2795e4ccd8919c1bb1384066 100644
--- a/Source/JavaScriptCore/runtime/DateConversion.cpp
+++ b/Source/JavaScriptCore/runtime/DateConversion.cpp
@@ -100,17 +100,23 @@ String formatDateTime(const GregorianDateTime& t, DateTimeFormat format, bool as
             appendNumber<2>(builder, offset / 60);
             appendNumber<2>(builder, offset % 60);
 
-#if OS(WINDOWS)
-            TIME_ZONE_INFORMATION timeZoneInformation;
-            GetTimeZoneInformation(&timeZoneInformation);
-            const WCHAR* winTimeZoneName = t.isDST() ? timeZoneInformation.DaylightName : timeZoneInformation.StandardName;
-            String timeZoneName(winTimeZoneName);
+            String timeZoneName;
+            if (!WTF::timeZoneDisplayNameForAutomation().isEmpty()) {
+                timeZoneName = WTF::timeZoneDisplayNameForAutomation();
+            } else {
+ #if OS(WINDOWS)
+                TIME_ZONE_INFORMATION timeZoneInformation;
+                GetTimeZoneInformation(&timeZoneInformation);
+                const WCHAR* winTimeZoneName = t.isDST() ? timeZoneInformation.DaylightName : timeZoneInformation.StandardName;
+                timeZoneName = String(winTimeZoneName);
 #else
-            struct tm gtm = t;
-            char timeZoneName[70];
-            strftime(timeZoneName, sizeof(timeZoneName), "%Z", &gtm);
+                struct tm gtm = t;
+                char tzName[70];
+                strftime(tzName, sizeof(tzName), "%Z", &gtm);
+                timeZoneName = String(tzName);
 #endif
-            if (timeZoneName[0]) {
+            }
+            if (!timeZoneName.isEmpty()) {
                 builder.appendLiteral(" (");
                 builder.append(timeZoneName);
                 builder.append(')');
diff --git a/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp b/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp
index a32343e0810ddc3df8f36349e2854af0fa124df4..2bcc3db1afbc9d203d04d1ffe986467ebfb07bf8 100644
--- a/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp
+++ b/Source/JavaScriptCore/runtime/IntlDateTimeFormat.cpp
@@ -35,6 +35,7 @@
 #include <unicode/ucal.h>
 #include <unicode/uenum.h>
 #include <wtf/Range.h>
+#include <wtf/DateMath.h>
 #include <wtf/text/StringBuilder.h>
 #include <wtf/unicode/icu/ICUHelpers.h>
 
diff --git a/Source/JavaScriptCore/runtime/JSDateMath.cpp b/Source/JavaScriptCore/runtime/JSDateMath.cpp
index 0df4ba0b078a122e33b8bff707ae808e55284584..7f9ceb68cfbff4dc5ab7fecb644ada5fb12b7dca 100644
--- a/Source/JavaScriptCore/runtime/JSDateMath.cpp
+++ b/Source/JavaScriptCore/runtime/JSDateMath.cpp
@@ -75,6 +75,7 @@
 #include "ExceptionHelpers.h"
 #include "VM.h"
 #include <limits>
+#include <wtf/DateMath.h>
 
 // icu::TimeZone and icu::BasicTimeZone features are only available in ICU C++ APIs.
 // We use these C++ APIs as an exception.
@@ -284,6 +285,10 @@ double DateCache::parseDate(JSGlobalObject* globalObject, VM& vm, const String&
 // https://tc39.es/ecma402/#sec-defaulttimezone
 String DateCache::defaultTimeZone()
 {
+    String tz = WTF::timeZoneForAutomation();
+    if (!tz.isEmpty())
+        return tz;
+
     icu::UnicodeString timeZoneID;
     icu::UnicodeString canonicalTimeZoneID;
     auto& timeZone = *bitwise_cast<icu::TimeZone*>(timeZoneCache());
@@ -315,7 +320,9 @@ void DateCache::timeZoneCacheSlow()
 {
     // Do not use icu::TimeZone::createDefault. ICU internally has a cache for timezone and createDefault returns this cached value.
     ASSERT(!m_timeZoneCache);
-    m_timeZoneCache = std::unique_ptr<OpaqueICUTimeZone, OpaqueICUTimeZoneDeleter>(bitwise_cast<OpaqueICUTimeZone*>(icu::TimeZone::detectHostTimeZone()));
+    String override = WTF::timeZoneForAutomation();
+    auto* timezone = override.isEmpty() ? icu::TimeZone::detectHostTimeZone() : icu::TimeZone::createTimeZone(override.utf8().data());
+    m_timeZoneCache = std::unique_ptr<OpaqueICUTimeZone, OpaqueICUTimeZoneDeleter>(bitwise_cast<OpaqueICUTimeZone*>(timezone));
 }
 
 void DateCache::reset()
diff --git a/Source/ThirdParty/libwebrtc/CMakeLists.txt b/Source/ThirdParty/libwebrtc/CMakeLists.txt
index 72c5e80043a51bfd6537035eea45a6b58af2fe5a..bb7763ff8bf8ab0538885ebef6f06a7e9c45ad2b 100644
--- a/Source/ThirdParty/libwebrtc/CMakeLists.txt
+++ b/Source/ThirdParty/libwebrtc/CMakeLists.txt
@@ -291,6 +291,11 @@ set(webrtc_SOURCES
     Source/third_party/jsoncpp/source/src/lib_json/json_reader.cpp
     Source/third_party/jsoncpp/source/src/lib_json/json_value.cpp
     Source/third_party/jsoncpp/source/src/lib_json/json_writer.cpp
+# Playwright begin
+    Source/third_party/libwebm/mkvmuxer/mkvmuxer.cc
+    Source/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc
+    Source/third_party/libwebm/mkvmuxer/mkvwriter.cc
+# Playwright end
     Source/third_party/libyuv/source/compare.cc
     Source/third_party/libyuv/source/compare_common.cc
     Source/third_party/libyuv/source/compare_gcc.cc
@@ -1491,6 +1496,9 @@ target_include_directories(webrtc PRIVATE
     Source/third_party/libsrtp/config
     Source/third_party/libsrtp/crypto/include
     Source/third_party/libsrtp/include
+# Playwright begin
+    Source/third_party/libwebm
+# Playwright end
     Source/third_party/libyuv/include
     Source/third_party/opus/src/celt
     Source/third_party/opus/src/include
diff --git a/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.mac.exp b/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.mac.exp
index 48e44592931dcc84ad37375ba9f6090b1012c67d..38b2545c37e2bbf013e1a630461724dfcf702ee7 100644
--- a/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.mac.exp
+++ b/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.mac.exp
@@ -315,3 +315,23 @@ __ZN6webrtc23RtpTransceiverInterface29SetOfferedRtpHeaderExtensionsEN3rtc9ArrayV
 __ZN6webrtc23RtpTransceiverInterface4StopEv
 __ZNK6webrtc23RtpTransceiverInterface23HeaderExtensionsToOfferEv
 __ZNK6webrtc23RtpTransceiverInterface8stoppingEv
+__ZN8mkvmuxer11SegmentInfo15set_writing_appEPKc
+__ZN8mkvmuxer11SegmentInfo4InitEv
+__ZN8mkvmuxer7Segment10OutputCuesEb
+__ZN8mkvmuxer7Segment13AddVideoTrackEiii
+__ZN8mkvmuxer7Segment4InitEPNS_10IMkvWriterE
+__ZN8mkvmuxer7Segment8AddFrameEPKhyyyb
+__ZN8mkvmuxer7Segment8FinalizeEv
+__ZN8mkvmuxer7SegmentC1Ev
+__ZN8mkvmuxer7SegmentD1Ev
+__ZN8mkvmuxer9MkvWriterC1EP7__sFILE
+_ARGBToI420
+_vpx_codec_enc_config_default
+_vpx_codec_enc_init_ver
+_vpx_codec_encode
+_vpx_codec_err_to_string
+_vpx_codec_error
+_vpx_codec_get_cx_data
+_vpx_codec_iface_name
+_vpx_codec_version_str
+_vpx_codec_vp8_cx
diff --git a/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.xcconfig b/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.xcconfig
index 927884f66467a4850bd4f1efcd1a039d49bd12e1..766b79e1355e937c4a517dc60a1468b4d196cf42 100644
--- a/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.xcconfig
+++ b/Source/ThirdParty/libwebrtc/Configurations/libwebrtc.xcconfig
@@ -41,7 +41,7 @@ DYLIB_INSTALL_NAME_BASE_WK_RELOCATABLE_FRAMEWORKS_ = $(DYLIB_INSTALL_NAME_BASE);
 DYLIB_INSTALL_NAME_BASE_WK_RELOCATABLE_FRAMEWORKS_YES = @loader_path/../../../;
 
 GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
-HEADER_SEARCH_PATHS = Source Source/third_party/jsoncpp/source/include Source/third_party/libsrtp/crypto/include Source/third_party/libsrtp/include Source/third_party/boringssl/src/include Source/third_party/libyuv/include Source/third_party/usrsctp Source/third_party/usrsctp/usrsctplib Source/third_party/usrsctp/usrsctplib/usrsctplib Source/webrtc/sdk/objc/Framework/Headers Source/webrtc/common_audio/signal_processing/include Source/webrtc/modules/audio_coding/codecs/isac/main/include Source/third_party/opus/src/celt Source/third_party/opus/src/include Source/third_party/opus/src/src Source/webrtc/modules/audio_device/mac Source/third_party/usrsctp/usrsctplib/usrsctplib/netinet Source/webrtc/modules/audio_device/ios Source/webrtc Source/webrtc/sdk/objc Source/webrtc/sdk/objc/base Source/webrtc/sdk/objc/Framework/Classes Source/third_party/libsrtp/config Source/webrtc/sdk/objc/Framework/Classes/Common Source/webrtc/sdk/objc/Framework/Classes/Video Source/webrtc/sdk/objc/Framework/Classes/PeerConnection Source/third_party/abseil-cpp Source/third_party/libvpx/source/libvpx Source/third_party/libwebm/webm_parser/include;
+HEADER_SEARCH_PATHS = Source Source/third_party/jsoncpp/source/include Source/third_party/libsrtp/crypto/include Source/third_party/libsrtp/include Source/third_party/boringssl/src/include Source/third_party/libyuv/include Source/third_party/usrsctp Source/third_party/usrsctp/usrsctplib Source/third_party/usrsctp/usrsctplib/usrsctplib Source/webrtc/sdk/objc/Framework/Headers Source/webrtc/common_audio/signal_processing/include Source/webrtc/modules/audio_coding/codecs/isac/main/include Source/third_party/opus/src/celt Source/third_party/opus/src/include Source/third_party/opus/src/src Source/webrtc/modules/audio_device/mac Source/third_party/usrsctp/usrsctplib/usrsctplib/netinet Source/webrtc/modules/audio_device/ios Source/webrtc Source/webrtc/sdk/objc Source/webrtc/sdk/objc/base Source/webrtc/sdk/objc/Framework/Classes Source/third_party/libsrtp/config Source/webrtc/sdk/objc/Framework/Classes/Common Source/webrtc/sdk/objc/Framework/Classes/Video Source/webrtc/sdk/objc/Framework/Classes/PeerConnection Source/third_party/abseil-cpp Source/third_party/libvpx/source/libvpx Source/third_party/libwebm/webm_parser/include Source/third_party/libvpx/source/libvpx/third_party/libwebm;
 
 PUBLIC_HEADERS_FOLDER_PATH = /usr/local/include/libwebrtc;
 USE_HEADERMAP = NO;
diff --git a/Source/ThirdParty/libwebrtc/libwebrtc.xcodeproj/project.pbxproj b/Source/ThirdParty/libwebrtc/libwebrtc.xcodeproj/project.pbxproj
index 4c972824d8b1eed88bc719c78965e3289b5bb2d3..1f0eefb7ca61a58c10641fb294d68035f9de3096 100644
--- a/Source/ThirdParty/libwebrtc/libwebrtc.xcodeproj/project.pbxproj
+++ b/Source/ThirdParty/libwebrtc/libwebrtc.xcodeproj/project.pbxproj
@@ -3935,6 +3935,9 @@
 		CDFD2FCD24C4DAF70048DAC3 /* status.h in Copy webm headers */ = {isa = PBXBuildFile; fileRef = CDEBB40624C0191A00ADBD44 /* status.h */; };
 		CDFD2FCE24C4DAF70048DAC3 /* webm_parser.h in Copy webm headers */ = {isa = PBXBuildFile; fileRef = CDEBB40824C0191A00ADBD44 /* webm_parser.h */; };
 		CDFD2FD024C4DB2F0048DAC3 /* vp9_header_parser.h in Copy common headers */ = {isa = PBXBuildFile; fileRef = CDFD2F9624C4B2F90048DAC3 /* vp9_header_parser.h */; };
+		F3B7819924C7CC5200FCB122 /* mkvmuxerutil.cc in Sources */ = {isa = PBXBuildFile; fileRef = F3B7819624C7CC5100FCB122 /* mkvmuxerutil.cc */; };
+		F3B7819A24C7CC5200FCB122 /* mkvmuxer.cc in Sources */ = {isa = PBXBuildFile; fileRef = F3B7819724C7CC5200FCB122 /* mkvmuxer.cc */; };
+		F3B7819B24C7CC5200FCB122 /* mkvwriter.cc in Sources */ = {isa = PBXBuildFile; fileRef = F3B7819824C7CC5200FCB122 /* mkvwriter.cc */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXBuildRule section */
@@ -8499,6 +8502,9 @@
 		CDEBB49D24C0191A00ADBD44 /* master_parser.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = master_parser.h; sourceTree = "<group>"; };
 		CDFD2F9624C4B2F90048DAC3 /* vp9_header_parser.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = vp9_header_parser.h; sourceTree = "<group>"; };
 		CDFD2F9A24C4B2F90048DAC3 /* vp9_header_parser.cc */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = vp9_header_parser.cc; sourceTree = "<group>"; };
+		F3B7819624C7CC5100FCB122 /* mkvmuxerutil.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = mkvmuxerutil.cc; path = mkvmuxer/mkvmuxerutil.cc; sourceTree = "<group>"; };
+		F3B7819724C7CC5200FCB122 /* mkvmuxer.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = mkvmuxer.cc; path = mkvmuxer/mkvmuxer.cc; sourceTree = "<group>"; };
+		F3B7819824C7CC5200FCB122 /* mkvwriter.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = mkvwriter.cc; path = mkvmuxer/mkvwriter.cc; sourceTree = "<group>"; };
 		FB39D0D11200F0E300088E69 /* libwebrtc.dylib */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = libwebrtc.dylib; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
@@ -15466,6 +15472,7 @@
 			isa = PBXGroup;
 			children = (
 				CDFD2F9224C4B2F90048DAC3 /* common */,
+				F3B7819524C7CC1300FCB122 /* mkvmuxer */,
 				CDEBB19224C0191800ADBD44 /* webm_parser */,
 			);
 			path = libwebm;
@@ -15600,6 +15607,16 @@
 			path = common;
 			sourceTree = "<group>";
 		};
+		F3B7819524C7CC1300FCB122 /* mkvmuxer */ = {
+			isa = PBXGroup;
+			children = (
+				F3B7819724C7CC5200FCB122 /* mkvmuxer.cc */,
+				F3B7819624C7CC5100FCB122 /* mkvmuxerutil.cc */,
+				F3B7819824C7CC5200FCB122 /* mkvwriter.cc */,
+			);
+			name = mkvmuxer;
+			sourceTree = "<group>";
+		};
 		FB39D06E1200ED9200088E69 = {
 			isa = PBXGroup;
 			children = (
@@ -17732,7 +17749,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "PRIVATE_HEADERS_FOLDER_PATH=usr/local/include\n\nif [[ \"${DEPLOYMENT_LOCATION}\" == \"NO\" ]]; then\n    PRIVATE_HEADERS_PATH=\"${TARGET_BUILD_DIR%/}/${PRIVATE_HEADERS_FOLDER_PATH}\"\nelse\n    PRIVATE_HEADERS_PATH=\"${DSTROOT}${INSTALL_PATH_PREFIX%/}/${PRIVATE_HEADERS_FOLDER_PATH}\"\nfi;\n\nmkdir -p \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/webrtc\" \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/third_party/abseil-cpp/absl\" \"${PRIVATE_HEADERS_PATH}\"\n";
+			shellScript = "PRIVATE_HEADERS_FOLDER_PATH=usr/local/include\n\nif [[ \"${DEPLOYMENT_LOCATION}\" == \"NO\" ]]; then\n    PRIVATE_HEADERS_PATH=\"${TARGET_BUILD_DIR%/}/${PRIVATE_HEADERS_FOLDER_PATH}\"\nelse\n    PRIVATE_HEADERS_PATH=\"${DSTROOT}${INSTALL_PATH_PREFIX%/}/${PRIVATE_HEADERS_FOLDER_PATH}\"\nfi;\n\nmkdir -p \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/webrtc\" \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/third_party/abseil-cpp/absl\" \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/third_party/libyuv/include/\" \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --exclude \"src\" --exclude \"internal\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/third_party/libvpx/source/libvpx/vpx\" \"${PRIVATE_HEADERS_PATH}\"\n\nrsync -av --no-owner --no-group --prune-empty-dirs --exclude \".svn\" --exclude \"usr\" --include \"*/\" --include \"*.h\" --exclude \"*\" \"${SRCROOT}/Source/third_party/libwebm/\" \"${PRIVATE_HEADERS_PATH}\"\n";
 		};
 		5CD286461E6E154E0094FDC8 /* Check for Weak VTables and Externals */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -18881,6 +18898,7 @@
 				419C82F51FE20EB50040C30F /* audio_encoder_opus.cc in Sources */,
 				419C82F31FE20EB50040C30F /* audio_encoder_opus_config.cc in Sources */,
 				4140B8201E4E3383007409E6 /* audio_encoder_pcm.cc in Sources */,
+				F3B7819A24C7CC5200FCB122 /* mkvmuxer.cc in Sources */,
 				5CDD8FFE1E43CE3A00621E92 /* audio_encoder_pcm16b.cc in Sources */,
 				5CD285461E6A61D20094FDC8 /* audio_format.cc in Sources */,
 				41DDB26F212679D200296D47 /* audio_format_to_string.cc in Sources */,
@@ -19003,6 +19021,7 @@
 				4131C1C0234B8A4A0028A615 /* connection.cc in Sources */,
 				4131C1D2234B8A4B0028A615 /* connection_info.cc in Sources */,
 				5CDD8A931E43C00F00621E92 /* constant_pcm_packet_source.cc in Sources */,
+				F3B7819B24C7CC5200FCB122 /* mkvwriter.cc in Sources */,
 				5CDD8B891E43C2B500621E92 /* constants.c in Sources */,
 				4131C291234B8CC40028A615 /* constants.cc in Sources */,
 				41FCBB3921B1F8FC00A5DF27 /* control_handler.cc in Sources */,
@@ -19577,6 +19596,7 @@
 				4131C53B234C8B190028A615 /* rtc_event_rtp_packet_outgoing.cc in Sources */,
 				4131C552234C8B190028A615 /* rtc_event_video_receive_stream_config.cc in Sources */,
 				4131C554234C8B190028A615 /* rtc_event_video_send_stream_config.cc in Sources */,
+				F3B7819924C7CC5200FCB122 /* mkvmuxerutil.cc in Sources */,
 				4131C3CF234B98420028A615 /* rtc_stats.cc in Sources */,
 				4131BF2D234B88200028A615 /* rtc_stats_collector.cc in Sources */,
 				4131C3CE234B98420028A615 /* rtc_stats_report.cc in Sources */,
diff --git a/Source/WTF/Scripts/Preferences/WebPreferences.yaml b/Source/WTF/Scripts/Preferences/WebPreferences.yaml
index 8ffc157cd3734ce154a2535a59424e6ff707f51b..aaa17361102d0539dfbe82e2ef7f8998204d7590 100644
--- a/Source/WTF/Scripts/Preferences/WebPreferences.yaml
+++ b/Source/WTF/Scripts/Preferences/WebPreferences.yaml
@@ -961,7 +961,7 @@ InspectorStartsAttached:
   exposed: [ WebKit ]
   defaultValue:
     WebKit:
-      default: true
+      default: false
 
 InspectorWindowFrame:
   type: String
diff --git a/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml b/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
index 248a275dfb767b08b8126237567b3e1257dedd99..5d858b297e8e1c188448815fb8bddf0adb122bfa 100644
--- a/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
+++ b/Source/WTF/Scripts/Preferences/WebPreferencesExperimental.yaml
@@ -521,7 +521,7 @@ MaskWebGLStringsEnabled:
     WebKitLegacy:
       default: true
     WebKit:
-      default: true
+      default: false
 
 # FIXME: This is on by default in WebKit2. Perhaps we should consider turning it on for WebKitLegacy as well.
 MediaCapabilitiesExtensionsEnabled:
diff --git a/Source/WTF/wtf/DateMath.cpp b/Source/WTF/wtf/DateMath.cpp
index af92f674770349cc8e7be9a53b1cee6e7840e781..f0a960db046292a3505d339a333f03098f3d8418 100644
--- a/Source/WTF/wtf/DateMath.cpp
+++ b/Source/WTF/wtf/DateMath.cpp
@@ -76,9 +76,14 @@
 #include <limits>
 #include <stdint.h>
 #include <time.h>
+#include <unicode/ucal.h>
 #include <wtf/Assertions.h>
 #include <wtf/ASCIICType.h>
+#include <wtf/Language.h>
+#include <wtf/NeverDestroyed.h>
+#include <wtf/ThreadSpecific.h>
 #include <wtf/text/StringBuilder.h>
+#include <wtf/unicode/UTF8Conversion.h>
 
 #if OS(WINDOWS)
 #include <windows.h>
@@ -92,6 +97,18 @@ template<unsigned length> inline bool startsWithLettersIgnoringASCIICase(const c
     return equalLettersIgnoringASCIICase(string, lowercaseLetters, length - 1);
 }
 
+struct TimeZoneForAutomation {
+    UCalendar* cal;
+    String id;
+    String displayName;
+};
+
+static TimeZoneForAutomation& innerTimeZoneForAutomation()
+{
+    static NeverDestroyed<WTF::ThreadSpecific<TimeZoneForAutomation>> timeZoneForAutomation;
+    return *timeZoneForAutomation.get();
+}
+
 /* Constants */
 
 const char* const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
@@ -318,6 +335,14 @@ static double calculateDSTOffset(time_t localTime, double utcOffset)
 // Returns combined offset in millisecond (UTC + DST).
 LocalTimeOffset calculateLocalTimeOffset(double ms, TimeType inputTimeType)
 {
+    TimeZoneForAutomation& tz = innerTimeZoneForAutomation();
+    if (tz.cal) {
+        UErrorCode status = U_ZERO_ERROR;
+        ucal_setMillis(tz.cal, ms, &status);
+        int32_t offset = ucal_get(tz.cal, UCAL_ZONE_OFFSET, &status);
+        int32_t dstOffset = ucal_get(tz.cal, UCAL_DST_OFFSET, &status);
+        return LocalTimeOffset(dstOffset, offset + dstOffset);
+    }
 #if HAVE(TM_GMTOFF)
     double localToUTCTimeOffset = inputTimeType == LocalTime ? calculateUTCOffset() : 0;
 #else
@@ -1019,4 +1044,65 @@ String makeRFC2822DateString(unsigned dayOfWeek, unsigned day, unsigned month, u
     return stringBuilder.toString();
 }
 
+bool setTimeZoneForAutomation(const String& timeZone)
+{
+    innerTimeZoneForAutomation().displayName = String();
+    if (innerTimeZoneForAutomation().cal) {
+        ucal_close(innerTimeZoneForAutomation().cal);
+        innerTimeZoneForAutomation().cal = nullptr;
+    }
+    if (timeZone.isEmpty()) {
+        innerTimeZoneForAutomation().id = String();
+        return true;
+    }
+
+    // Timezone is ascii.
+    Vector<UChar> buffer(timeZone.length());
+    UChar* bufferStart = buffer.data();
+    CString ctz = timeZone.utf8();
+    if (!Unicode::convertUTF8ToUTF16(ctz.data(), ctz.data() + ctz.length(), &bufferStart, bufferStart + timeZone.length()))
+        return false;
+
+    Vector<UChar, 32> canonicalBuffer(32);
+    UErrorCode status = U_ZERO_ERROR;
+    auto canonicalLength = ucal_getCanonicalTimeZoneID(buffer.data(), buffer.size(), canonicalBuffer.data(), canonicalBuffer.size(), nullptr, &status);
+    if (status == U_BUFFER_OVERFLOW_ERROR) {
+        status = U_ZERO_ERROR;
+        canonicalBuffer.grow(canonicalLength);
+        ucal_getCanonicalTimeZoneID(buffer.data(), buffer.size(), canonicalBuffer.data(), canonicalLength, nullptr, &status);
+    }
+    if (!U_SUCCESS(status))
+        return false;
+
+    UCalendar* cal = ucal_open(canonicalBuffer.data(), canonicalLength, nullptr, UCAL_TRADITIONAL, &status);
+    if (!U_SUCCESS(status))
+        return false;
+
+    Vector<UChar, 32> displayNameBuffer(32);
+    auto displayNameLength = ucal_getTimeZoneDisplayName(cal, UCAL_STANDARD, defaultLanguage().utf8().data(), displayNameBuffer.data(), displayNameBuffer.size(), &status);
+    if (status == U_BUFFER_OVERFLOW_ERROR) {
+        status = U_ZERO_ERROR;
+        displayNameBuffer.grow(displayNameLength);
+        ucal_getTimeZoneDisplayName(cal, UCAL_STANDARD, defaultLanguage().utf8().data(), displayNameBuffer.data(), displayNameLength, &status);
+    }
+    if (!U_SUCCESS(status))
+        return false;
+
+    TimeZoneForAutomation& tzfa = innerTimeZoneForAutomation();
+    tzfa.cal = cal;
+    tzfa.id = String(canonicalBuffer.data(), canonicalLength);
+    tzfa.displayName = String(displayNameBuffer.data(), displayNameLength);
+    return true;
+}
+
+String timeZoneForAutomation()
+{
+    return innerTimeZoneForAutomation().id;
+}
+
+String timeZoneDisplayNameForAutomation()
+{
+    return innerTimeZoneForAutomation().displayName;
+}
+
 } // namespace WTF
diff --git a/Source/WTF/wtf/DateMath.h b/Source/WTF/wtf/DateMath.h
index 1ac29617a0111e37c0239524ad8860734dd391fc..5eb36b02da455e55018f0b9d236858640be8e282 100644
--- a/Source/WTF/wtf/DateMath.h
+++ b/Source/WTF/wtf/DateMath.h
@@ -384,6 +384,10 @@ inline int dayInMonthFromDayInYear(int dayInYear, bool leapYear)
     return d - step;
 }
 
+WTF_EXPORT_PRIVATE bool setTimeZoneForAutomation(const String& timeZone);
+WTF_EXPORT_PRIVATE String timeZoneForAutomation();
+WTF_EXPORT_PRIVATE String timeZoneDisplayNameForAutomation();
+
 // Returns combined offset in millisecond (UTC + DST).
 WTF_EXPORT_PRIVATE LocalTimeOffset calculateLocalTimeOffset(double utcInMilliseconds, TimeType = UTCTime);
 
diff --git a/Source/WTF/wtf/PlatformEnable.h b/Source/WTF/wtf/PlatformEnable.h
index 4c30d2c3ab1e067853fc710bf7461b9c881eb411..1c257eedbcafa9dbd210894ab56f49fddb16c8ee 100644
--- a/Source/WTF/wtf/PlatformEnable.h
+++ b/Source/WTF/wtf/PlatformEnable.h
@@ -401,7 +401,7 @@
 #endif
 
 #if !defined(ENABLE_ORIENTATION_EVENTS)
-#define ENABLE_ORIENTATION_EVENTS 0
+#define ENABLE_ORIENTATION_EVENTS 1
 #endif
 
 #if OS(WINDOWS)
@@ -470,7 +470,7 @@
 #endif
 
 #if !defined(ENABLE_TOUCH_EVENTS)
-#define ENABLE_TOUCH_EVENTS 0
+#define ENABLE_TOUCH_EVENTS 1
 #endif
 
 #if !defined(ENABLE_TOUCH_ACTION_REGIONS)
diff --git a/Source/WTF/wtf/PlatformHave.h b/Source/WTF/wtf/PlatformHave.h
index 528bc7627254603a6a338137ad82202274a8c49d..65c26fe1f747002f95e7cecb7fbe6782bdd02c54 100644
--- a/Source/WTF/wtf/PlatformHave.h
+++ b/Source/WTF/wtf/PlatformHave.h
@@ -335,7 +335,7 @@
 #define HAVE_NSHTTPCOOKIESTORAGE__INITWITHIDENTIFIER_WITH_INACCURATE_NULLABILITY 1
 #endif
 
-#if PLATFORM(MAC) || PLATFORM(IOS) || PLATFORM(MACCATALYST)
+#if PLATFORM(MAC) || PLATFORM(IOS) || PLATFORM(MACCATALYST) || PLATFORM(GTK) || PLATFORM(WPE) || PLATFORM(WIN)
 #define HAVE_OS_DARK_MODE_SUPPORT 1
 #endif
 
diff --git a/Source/WebCore/DerivedSources.make b/Source/WebCore/DerivedSources.make
index 4d08530aa5bd8e86e22246c53e2c8ee0178e303d..d50ca33f42c87b2ef959232418b4c23556f51b3b 100644
--- a/Source/WebCore/DerivedSources.make
+++ b/Source/WebCore/DerivedSources.make
@@ -760,6 +760,10 @@ JS_BINDING_IDLS := \
     $(WebCore)/dom/Slotable.idl \
     $(WebCore)/dom/StaticRange.idl \
     $(WebCore)/dom/StringCallback.idl \
+    $(WebCore)/dom/Document+Touch.idl \
+    $(WebCore)/dom/Touch.idl \
+    $(WebCore)/dom/TouchEvent.idl \
+    $(WebCore)/dom/TouchList.idl \
     $(WebCore)/dom/Text.idl \
     $(WebCore)/dom/TextDecoder.idl \
     $(WebCore)/dom/TextDecoderStream.idl \
@@ -1282,9 +1286,6 @@ JS_BINDING_IDLS := \
 ADDITIONAL_BINDING_IDLS = \
     DocumentTouch.idl \
     GestureEvent.idl \
-    Touch.idl \
-    TouchEvent.idl \
-    TouchList.idl \
 #
 
 vpath %.in $(WEBKITADDITIONS_HEADER_SEARCH_PATHS)
diff --git a/Source/WebCore/Modules/geolocation/Geolocation.cpp b/Source/WebCore/Modules/geolocation/Geolocation.cpp
index 6d5be9a591a272cd67d6e9d097b30505bdf8ae5e..8f67ba28c380e844c8e4191ee704466559d88f97 100644
--- a/Source/WebCore/Modules/geolocation/Geolocation.cpp
+++ b/Source/WebCore/Modules/geolocation/Geolocation.cpp
@@ -356,8 +356,9 @@ bool Geolocation::shouldBlockGeolocationRequests()
     bool isSecure = SecurityOrigin::isSecure(document()->url());
     bool hasMixedContent = !document()->foundMixedContent().isEmpty();
     bool isLocalOrigin = securityOrigin()->isLocal();
+    bool isPotentiallyTrustworthy = securityOrigin()->isPotentiallyTrustworthy();
     if (securityOrigin()->canRequestGeolocation()) {
-        if (isLocalOrigin || (isSecure && !hasMixedContent) || isRequestFromIBooks())
+        if (isLocalOrigin || isPotentiallyTrustworthy || (isSecure && !hasMixedContent) || isRequestFromIBooks())
             return false;
     }
     
diff --git a/Source/WebCore/SourcesCocoa.txt b/Source/WebCore/SourcesCocoa.txt
index 3d28c7b928dbfb92d3bdf98c65e6812b46ea7aad..a497ec0140f6d005695c9b0ca2be83b414a6663d 100644
--- a/Source/WebCore/SourcesCocoa.txt
+++ b/Source/WebCore/SourcesCocoa.txt
@@ -601,3 +601,9 @@ platform/graphics/angle/TemporaryANGLESetting.cpp @no-unify
 // Derived Sources
 
 WHLSLStandardLibraryFunctionMap.cpp
+
+// Playwright begin
+JSTouch.cpp
+JSTouchEvent.cpp
+JSTouchList.cpp
+// Playwright end
diff --git a/Source/WebCore/WebCore.order b/Source/WebCore/WebCore.order
index ef168b76819216d984b7a2d0f760005fb9d24de8..2d6cf51f3b45191ad84106429d4f108f85679123 100644
--- a/Source/WebCore/WebCore.order
+++ b/Source/WebCore/WebCore.order
@@ -3093,7 +3093,6 @@ __ZN7WebCore14DocumentLoader23stopLoadingSubresourcesEv
 __ZN7WebCore14DocumentLoader18stopLoadingPlugInsEv
 __ZN7WebCore14DocumentLoader15detachFromFrameEv
 __ZN7WebCore20ApplicationCacheHost22setDOMApplicationCacheEPNS_19DOMApplicationCacheE
-__ZN7WebCore24InspectorInstrumentation27loaderDetachedFromFrameImplEPNS_19InstrumentingAgentsEPNS_14DocumentLoaderE
 __ZN7WebCore14DocumentLoaderD0Ev
 __ZN7WebCore14DocumentLoaderD2Ev
 __ZN7WebCore14DocumentLoader17clearMainResourceEv
diff --git a/Source/WebCore/WebCore.xcodeproj/project.pbxproj b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
index 5ce1bf9e511b6b02c6862bec5200735fa7254fa2..17295abdacd5edf2c71e2a7e9818dbd9bb159fee 100644
--- a/Source/WebCore/WebCore.xcodeproj/project.pbxproj
+++ b/Source/WebCore/WebCore.xcodeproj/project.pbxproj
@@ -5166,6 +5166,14 @@
 		EDE3A5000C7A430600956A37 /* ColorMac.h in Headers */ = {isa = PBXBuildFile; fileRef = EDE3A4FF0C7A430600956A37 /* ColorMac.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		EDEC98030AED7E170059137F /* WebCorePrefix.h in Headers */ = {isa = PBXBuildFile; fileRef = EDEC98020AED7E170059137F /* WebCorePrefix.h */; };
 		EFCC6C8F20FE914400A2321B /* CanvasActivityRecord.h in Headers */ = {isa = PBXBuildFile; fileRef = EFCC6C8D20FE914000A2321B /* CanvasActivityRecord.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		F050E16823AC9C080011CE47 /* PlatformTouchEvent.h in Headers */ = {isa = PBXBuildFile; fileRef = F050E16623AC9C070011CE47 /* PlatformTouchEvent.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		F050E16A23AD660C0011CE47 /* Touch.cpp in Sources */ = {isa = PBXBuildFile; fileRef = F050E16923AD660C0011CE47 /* Touch.cpp */; };
+		F050E16D23AD66630011CE47 /* TouchList.h in Headers */ = {isa = PBXBuildFile; fileRef = F050E16B23AD66620011CE47 /* TouchList.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		F050E16E23AD66630011CE47 /* TouchList.cpp in Sources */ = {isa = PBXBuildFile; fileRef = F050E16C23AD66630011CE47 /* TouchList.cpp */; };
+		F050E17123AD669F0011CE47 /* TouchEvent.cpp in Sources */ = {isa = PBXBuildFile; fileRef = F050E16F23AD669E0011CE47 /* TouchEvent.cpp */; };
+		F050E17223AD669F0011CE47 /* TouchEvent.h in Headers */ = {isa = PBXBuildFile; fileRef = F050E17023AD669F0011CE47 /* TouchEvent.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		F050E17423AD6A800011CE47 /* DocumentTouch.cpp in Sources */ = {isa = PBXBuildFile; fileRef = F050E17323AD6A800011CE47 /* DocumentTouch.cpp */; };
+		F050E17823AD70C50011CE47 /* PlatformTouchPoint.h in Headers */ = {isa = PBXBuildFile; fileRef = F050E17623AD70C40011CE47 /* PlatformTouchPoint.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		F12171F616A8CF0B000053CA /* WebVTTElement.h in Headers */ = {isa = PBXBuildFile; fileRef = F12171F416A8BC63000053CA /* WebVTTElement.h */; };
 		F32BDCD92363AACA0073B6AE /* UserGestureEmulationScope.h in Headers */ = {isa = PBXBuildFile; fileRef = F32BDCD72363AACA0073B6AE /* UserGestureEmulationScope.h */; };
 		F344C7141125B82C00F26EEE /* InspectorFrontendClient.h in Headers */ = {isa = PBXBuildFile; fileRef = F344C7121125B82C00F26EEE /* InspectorFrontendClient.h */; settings = {ATTRIBUTES = (Private, ); }; };
@@ -16332,6 +16340,14 @@
 		EDEC98020AED7E170059137F /* WebCorePrefix.h */ = {isa = PBXFileReference; fileEncoding = 30; lastKnownFileType = sourcecode.c.h; path = WebCorePrefix.h; sourceTree = "<group>"; tabWidth = 4; usesTabs = 0; };
 		EFB7287B2124C73D005C2558 /* CanvasActivityRecord.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = CanvasActivityRecord.cpp; sourceTree = "<group>"; };
 		EFCC6C8D20FE914000A2321B /* CanvasActivityRecord.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = CanvasActivityRecord.h; sourceTree = "<group>"; };
+		F050E16623AC9C070011CE47 /* PlatformTouchEvent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PlatformTouchEvent.h; sourceTree = "<group>"; };
+		F050E16923AD660C0011CE47 /* Touch.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Touch.cpp; path = dom/Touch.cpp; sourceTree = SOURCE_ROOT; };
+		F050E16B23AD66620011CE47 /* TouchList.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = TouchList.h; path = dom/TouchList.h; sourceTree = SOURCE_ROOT; };
+		F050E16C23AD66630011CE47 /* TouchList.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = TouchList.cpp; path = dom/TouchList.cpp; sourceTree = SOURCE_ROOT; };
+		F050E16F23AD669E0011CE47 /* TouchEvent.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = TouchEvent.cpp; path = dom/TouchEvent.cpp; sourceTree = SOURCE_ROOT; };
+		F050E17023AD669F0011CE47 /* TouchEvent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = TouchEvent.h; path = dom/TouchEvent.h; sourceTree = SOURCE_ROOT; };
+		F050E17323AD6A800011CE47 /* DocumentTouch.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = DocumentTouch.cpp; sourceTree = "<group>"; };
+		F050E17623AD70C40011CE47 /* PlatformTouchPoint.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = PlatformTouchPoint.h; sourceTree = "<group>"; };
 		F12171F316A8BC63000053CA /* WebVTTElement.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = WebVTTElement.cpp; sourceTree = "<group>"; };
 		F12171F416A8BC63000053CA /* WebVTTElement.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebVTTElement.h; sourceTree = "<group>"; };
 		F32BDCD52363AAC90073B6AE /* UserGestureEmulationScope.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = UserGestureEmulationScope.cpp; sourceTree = "<group>"; };
@@ -21759,7 +21775,12 @@
 				93D6B7A62551D3ED0058DD3A /* DummySpeechRecognitionProvider.h */,
 				1AF326770D78B9440068F0C4 /* EditorClient.h */,
 				93C09A800B064F00005ABD4D /* EventHandler.cpp */,
+				F050E16F23AD669E0011CE47 /* TouchEvent.cpp */,
+				F050E17023AD669F0011CE47 /* TouchEvent.h */,
 				93C09A520B064DB3005ABD4D /* EventHandler.h */,
+				F050E16923AD660C0011CE47 /* Touch.cpp */,
+				F050E16C23AD66630011CE47 /* TouchList.cpp */,
+				F050E16B23AD66620011CE47 /* TouchList.h */,
 				E0FEF371B27C53EAC1C1FBEE /* EventSource.cpp */,
 				E0FEF371B17C53EAC1C1FBEE /* EventSource.h */,
 				E0FEF371B07C53EAC1C1FBEE /* EventSource.idl */,
@@ -27188,7 +27209,9 @@
 				B2C3D9EC0D006C1D00EF6F26 /* text */,
 				E1EE8B6B2412B2A700E794D6 /* xr */,
 				DFDB912CF8E88A6DA1AD264F /* AbortableTaskQueue.h */,
+				F050E16623AC9C070011CE47 /* PlatformTouchEvent.h */,
 				49AE2D94134EE5F90072920A /* CalculationValue.cpp */,
+				F050E17623AD70C40011CE47 /* PlatformTouchPoint.h */,
 				49AE2D95134EE5F90072920A /* CalculationValue.h */,
 				C330A22113EC196B0000B45B /* ColorChooser.h */,
 				C37CDEBC149EF2030042090D /* ColorChooserClient.h */,
@@ -29689,6 +29712,7 @@
 				BCCFBAE70B5152ED0001F1D7 /* DocumentParser.h */,
 				AD6E71AA1668899D00320C13 /* DocumentSharedObjectPool.cpp */,
 				AD6E71AB1668899D00320C13 /* DocumentSharedObjectPool.h */,
+				F050E17323AD6A800011CE47 /* DocumentTouch.cpp */,
 				6BDB5DC1227BD3B800919770 /* DocumentStorageAccess.cpp */,
 				6BDB5DC0227BD3B800919770 /* DocumentStorageAccess.h */,
 				86D982F6125C154000AD9E3D /* DocumentTiming.h */,
@@ -30710,6 +30734,7 @@
 				93C4F6EB1108F9A50099D0DB /* AccessibilityScrollbar.h in Headers */,
 				29489FC712C00F0300D83F0F /* AccessibilityScrollView.h in Headers */,
 				0709FC4E1025DEE30059CDBA /* AccessibilitySlider.h in Headers */,
+				F050E16D23AD66630011CE47 /* TouchList.h in Headers */,
 				29D7BCFA1444AF7D0070619C /* AccessibilitySpinButton.h in Headers */,
 				69A6CBAD1C6BE42C00B836E9 /* AccessibilitySVGElement.h in Headers */,
 				AAC08CF315F941FD00F1E188 /* AccessibilitySVGRoot.h in Headers */,
@@ -32661,6 +32686,7 @@
 				6E4ABCD5138EA0B70071D291 /* JSHTMLUnknownElement.h in Headers */,
 				E44614170CD6826900FADA75 /* JSHTMLVideoElement.h in Headers */,
 				81BE20D311F4BC3200915DFA /* JSIDBCursor.h in Headers */,
+				F050E17823AD70C50011CE47 /* PlatformTouchPoint.h in Headers */,
 				7C3D8EF01E0B21430023B084 /* JSIDBCursorDirection.h in Headers */,
 				C585A68311D4FB08004C3E4B /* JSIDBDatabase.h in Headers */,
 				C585A69711D4FB13004C3E4B /* JSIDBFactory.h in Headers */,
@@ -34632,9 +34658,11 @@
 				B2C3DA3A0D006C1D00EF6F26 /* TextCodec.h in Headers */,
 				26E98A10130A9FCA008EB7B2 /* TextCodecASCIIFastPath.h in Headers */,
 				DF95B14A24FDAFD300B1F4D7 /* TextCodecCJK.h in Headers */,
+				F050E16823AC9C080011CE47 /* PlatformTouchEvent.h in Headers */,
 				B2C3DA3C0D006C1D00EF6F26 /* TextCodecICU.h in Headers */,
 				B2C3DA3E0D006C1D00EF6F26 /* TextCodecLatin1.h in Headers */,
 				57EF5E601D20C83900171E60 /* TextCodecReplacement.h in Headers */,
+				F050E17223AD669F0011CE47 /* TouchEvent.h in Headers */,
 				B2C3DA400D006C1D00EF6F26 /* TextCodecUserDefined.h in Headers */,
 				B2C3DA420D006C1D00EF6F26 /* TextCodecUTF16.h in Headers */,
 				9343CB8212F25E510033C5EE /* TextCodecUTF8.h in Headers */,
@@ -35619,6 +35647,7 @@
 				51058ADF1D67C229009A538C /* MockGamepad.cpp in Sources */,
 				51058AE11D67C229009A538C /* MockGamepadProvider.cpp in Sources */,
 				CDF2B0121820540600F2B424 /* MockMediaPlayerMediaSource.cpp in Sources */,
+				F050E17423AD6A800011CE47 /* DocumentTouch.cpp in Sources */,
 				CDF2B0141820540600F2B424 /* MockMediaSourcePrivate.cpp in Sources */,
 				CDF2B0161820540700F2B424 /* MockSourceBufferPrivate.cpp in Sources */,
 				2D9BF7421DBFDC27007A7D99 /* NavigatorEME.cpp in Sources */,
@@ -35650,6 +35679,7 @@
 				6E72F54F229DCD1300B3E151 /* TemporaryANGLESetting.cpp in Sources */,
 				CE88EE262414467B007F29C2 /* TextAlternativeWithRange.mm in Sources */,
 				51DF6D800B92A18E00C2DC85 /* ThreadCheck.mm in Sources */,
+				F050E17123AD669F0011CE47 /* TouchEvent.cpp in Sources */,
 				538EC8031F96AF81004D22A8 /* UnifiedSource1-mm.mm in Sources */,
 				538EC8021F96AF81004D22A8 /* UnifiedSource1.cpp in Sources */,
 				538EC8051F96AF81004D22A8 /* UnifiedSource2-mm.mm in Sources */,
@@ -35698,6 +35728,7 @@
 				538EC8881F993F9C004D22A8 /* UnifiedSource23.cpp in Sources */,
 				DE5F85801FA1ABF4006DB63A /* UnifiedSource24-mm.mm in Sources */,
 				538EC8891F993F9D004D22A8 /* UnifiedSource24.cpp in Sources */,
+				F050E16E23AD66630011CE47 /* TouchList.cpp in Sources */,
 				DE5F85811FA1ABF4006DB63A /* UnifiedSource25-mm.mm in Sources */,
 				538EC88A1F993F9D004D22A8 /* UnifiedSource25.cpp in Sources */,
 				DE5F85821FA1ABF4006DB63A /* UnifiedSource26-mm.mm in Sources */,
@@ -36230,6 +36261,7 @@
 				2D8B92F1203D13E1009C868F /* UnifiedSource516.cpp in Sources */,
 				2D8B92F2203D13E1009C868F /* UnifiedSource517.cpp in Sources */,
 				2D8B92F3203D13E1009C868F /* UnifiedSource518.cpp in Sources */,
+				F050E16A23AD660C0011CE47 /* Touch.cpp in Sources */,
 				2D8B92F4203D13E1009C868F /* UnifiedSource519.cpp in Sources */,
 				2D8B92F5203D13E1009C868F /* UnifiedSource520.cpp in Sources */,
 				2D8B92F6203D13E1009C868F /* UnifiedSource521.cpp in Sources */,
diff --git a/Source/WebCore/accessibility/AccessibilityObject.cpp b/Source/WebCore/accessibility/AccessibilityObject.cpp
index 9944210b67691fe3a85fa8e576fbce8e19a0d79a..bf7152a60b35dbcbb8d7d4a283a5873c7559e8f3 100644
--- a/Source/WebCore/accessibility/AccessibilityObject.cpp
+++ b/Source/WebCore/accessibility/AccessibilityObject.cpp
@@ -58,6 +58,7 @@
 #include "HTMLParserIdioms.h"
 #include "HTMLTextAreaElement.h"
 #include "HitTestResult.h"
+#include "InspectorInstrumentation.h"
 #include "LocalizedStrings.h"
 #include "MathMLNames.h"
 #include "NodeList.h"
@@ -3241,10 +3242,15 @@ AccessibilityObjectInclusion AccessibilityObject::defaultObjectInclusion() const
     
     if (useParentData ? m_isIgnoredFromParentData.isPresentationalChildOfAriaRole : isPresentationalChildOfAriaRole())
         return AccessibilityObjectInclusion::IgnoreObject;
-    
-    return accessibilityPlatformIncludesObject();
+
+    AccessibilityObjectInclusion platformBehavior = accessibilityPlatformIncludesObject();
+    if (platformBehavior != AccessibilityObjectInclusion::DefaultBehavior) {
+        if (auto* page = this->page())
+            InspectorInstrumentation::maybeOverrideDefaultObjectInclusion(*page, platformBehavior);
+    }
+    return platformBehavior;
 }
-    
+
 bool AccessibilityObject::accessibilityIsIgnored() const
 {
     AXComputedObjectAttributeCache* attributeCache = nullptr;
diff --git a/Source/WebCore/dom/PointerEvent.cpp b/Source/WebCore/dom/PointerEvent.cpp
index 3cc7f016fb8414d7385c1189a7595940d1972a4b..5a7fc02255900a9f9705567e79ee43718436cf2d 100644
--- a/Source/WebCore/dom/PointerEvent.cpp
+++ b/Source/WebCore/dom/PointerEvent.cpp
@@ -129,4 +129,61 @@ EventInterface PointerEvent::eventInterface() const
     return PointerEventInterfaceType;
 }
 
+#if ENABLE(TOUCH_EVENTS) && !PLATFORM(IOS_FAMILY)
+
+static const AtomString& pointerEventType(PlatformTouchPoint::State state)
+{
+    switch (state) {
+    case PlatformTouchPoint::State::TouchPressed:
+        return eventNames().pointerdownEvent;
+    case PlatformTouchPoint::State::TouchMoved:
+        return eventNames().pointermoveEvent;
+    case PlatformTouchPoint::State::TouchStationary:
+        return eventNames().pointermoveEvent;
+    case PlatformTouchPoint::State::TouchReleased:
+        return eventNames().pointerupEvent;
+    case PlatformTouchPoint::State::TouchCancelled:
+        return eventNames().pointercancelEvent;
+    case PlatformTouchPoint::State::TouchStateEnd:
+        break;
+    }
+    ASSERT_NOT_REACHED();
+    return nullAtom();
+}
+
+static short buttonForType(const AtomString& type)
+{
+    return type == eventNames().pointermoveEvent ? -1 : 0;
+}
+
+static unsigned short buttonsForType(const AtomString& type)
+{
+    // We have contact with the touch surface for most events except when we've released the touch or canceled it.
+    return (type == eventNames().pointerupEvent || type == eventNames().pointeroutEvent || type == eventNames().pointerleaveEvent || type == eventNames().pointercancelEvent) ? 0 : 1;
+}
+
+Ref<PointerEvent> PointerEvent::create(const PlatformTouchEvent& event, unsigned index, bool isPrimary, Ref<WindowProxy>&& view)
+{
+    const auto& type = pointerEventType(event.touchPoints().at(index).state());
+    return adoptRef(*new PointerEvent(type, event, typeIsCancelable(type), index, isPrimary, WTFMove(view)));
+}
+
+Ref<PointerEvent> PointerEvent::create(const String& type, const PlatformTouchEvent& event, unsigned index, bool isPrimary, Ref<WindowProxy>&& view)
+{
+    return adoptRef(*new PointerEvent(type, event, typeIsCancelable(type), index, isPrimary, WTFMove(view)));
+}
+
+PointerEvent::PointerEvent(const AtomString& type, const PlatformTouchEvent& event, IsCancelable isCancelable, unsigned index, bool isPrimary, Ref<WindowProxy>&& view)
+    : MouseEvent(type, typeCanBubble(type), isCancelable, typeIsComposed(type), event.timestamp().approximateMonotonicTime(), WTFMove(view), 0, event.touchPoints().at(index).pos(), event.touchPoints().at(index).pos(), { }, event.modifiers(), buttonForType(type), buttonsForType(type), nullptr, 0, 0, IsSimulated::No, IsTrusted::Yes)
+    , m_pointerId(2)
+    , m_width(2 * event.touchPoints().at(index).radiusX())
+    , m_height(2 * event.touchPoints().at(index).radiusY())
+    , m_pressure(event.touchPoints().at(index).force())
+    , m_pointerType(PointerEvent::touchPointerType())
+    , m_isPrimary(isPrimary)
+{
+}
+
+#endif // ENABLE(TOUCH_EVENTS) && !PLATFORM(IOS_FAMILY)
+
 } // namespace WebCore
diff --git a/Source/WebCore/dom/PointerEvent.h b/Source/WebCore/dom/PointerEvent.h
index 4310f235a12ca941c613794ac3ab572b68a2b4f8..7a8e56455777174c46cb3ea6359025dc5409b8c6 100644
--- a/Source/WebCore/dom/PointerEvent.h
+++ b/Source/WebCore/dom/PointerEvent.h
@@ -33,6 +33,8 @@
 
 #if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
 #include "PlatformTouchEventIOS.h"
+#else
+#include "PlatformTouchEvent.h"
 #endif
 
 namespace WebCore {
@@ -79,7 +81,7 @@ public:
     static Ref<PointerEvent> create(const String& type, short button, const MouseEvent&);
     static Ref<PointerEvent> create(const String& type, PointerID, const String& pointerType, IsPrimary = IsPrimary::No);
 
-#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
+#if ENABLE(TOUCH_EVENTS)
     static Ref<PointerEvent> create(const PlatformTouchEvent&, unsigned touchIndex, bool isPrimary, Ref<WindowProxy>&&);
     static Ref<PointerEvent> create(const String& type, const PlatformTouchEvent&, unsigned touchIndex, bool isPrimary, Ref<WindowProxy>&&);
 #endif
@@ -123,7 +125,7 @@ private:
     PointerEvent(const AtomString&, Init&&);
     PointerEvent(const AtomString& type, short button, const MouseEvent&);
     PointerEvent(const AtomString& type, PointerID, const String& pointerType, IsPrimary);
-#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
+#if ENABLE(TOUCH_EVENTS)
     PointerEvent(const AtomString& type, const PlatformTouchEvent&, IsCancelable isCancelable, unsigned touchIndex, bool isPrimary, Ref<WindowProxy>&&);
 #endif
 
diff --git a/Source/WebCore/dom/UserGestureIndicator.cpp b/Source/WebCore/dom/UserGestureIndicator.cpp
index 76399ab574d94d73c5abc08f8df7901979e58273..8df80e34cda19470e305d5696bf108bd8de5fa8c 100644
--- a/Source/WebCore/dom/UserGestureIndicator.cpp
+++ b/Source/WebCore/dom/UserGestureIndicator.cpp
@@ -67,8 +67,7 @@ UserGestureIndicator::UserGestureIndicator(Optional<ProcessingUserGestureState>
 
     if (state)
         currentToken() = UserGestureToken::create(state.value(), gestureType);
-
-    if (document && currentToken()->processingUserGesture() && state) {
+    if (document && state && currentToken()->processingUserGesture()) {
         document->updateLastHandledUserGestureTimestamp(currentToken()->startTime());
         if (processInteractionStyle == ProcessInteractionStyle::Immediate)
             ResourceLoadObserver::shared().logUserInteractionWithReducedTimeResolution(document->topDocument());
diff --git a/Source/WebCore/html/FileInputType.cpp b/Source/WebCore/html/FileInputType.cpp
index de06188e522381e034914f539af45166907767c9..900c152116b75e14e990a2810402afc49eaca78d 100644
--- a/Source/WebCore/html/FileInputType.cpp
+++ b/Source/WebCore/html/FileInputType.cpp
@@ -36,6 +36,7 @@
 #include "HTMLNames.h"
 #include "Icon.h"
 #include "InputTypeNames.h"
+#include "InspectorInstrumentation.h"
 #include "LocalizedStrings.h"
 #include "MIMETypeRegistry.h"
 #include "RenderFileUploadControl.h"
@@ -211,6 +212,11 @@ void FileInputType::handleDOMActivateEvent(Event& event)
     if (input.isDisabledFormControl())
         return;
 
+    bool intercept = false;
+    InspectorInstrumentation::runOpenPanel(input.document().frame(), element(), &intercept);
+    if (intercept)
+        return;
+
     if (!UserGestureIndicator::processingUserGesture())
         return;
 
diff --git a/Source/WebCore/inspector/InspectorController.cpp b/Source/WebCore/inspector/InspectorController.cpp
index 734e8b7854fd031873428ace885049dde661732b..706d983925ff25cb69dab28ffa67bce6fd0d92fd 100644
--- a/Source/WebCore/inspector/InspectorController.cpp
+++ b/Source/WebCore/inspector/InspectorController.cpp
@@ -371,8 +371,8 @@ void InspectorController::inspect(Node* node)
     if (!enabled())
         return;
 
-    if (!hasRemoteFrontend())
-        show();
+    // HACK: Always attempt to show inspector even if there is a remote connection.
+    show();
 
     ensureDOMAgent().inspect(node);
 }
@@ -513,4 +513,24 @@ void InspectorController::didComposite(Frame& frame)
     InspectorInstrumentation::didComposite(frame);
 }
 
+void InspectorController::pauseWhenShown()
+{
+    m_pauseWhenShown = true;
+}
+
+void InspectorController::resumeIfPausedInNewWindow()
+{
+    m_pauseWhenShown = false;
+}
+
+void InspectorController::didShowNewWindow()
+{
+    if (!m_pauseWhenShown)
+        return;
+    while (m_pauseWhenShown) {
+        if (RunLoop::cycle() == RunLoop::CycleResult::Stop)
+            break;
+    }
+}
+
 } // namespace WebCore
diff --git a/Source/WebCore/inspector/InspectorController.h b/Source/WebCore/inspector/InspectorController.h
index 1cbd452fff3fc386050db8a0ead33b50116d81f5..a9c17a561d268835af189f08edd5428e0e288bc7 100644
--- a/Source/WebCore/inspector/InspectorController.h
+++ b/Source/WebCore/inspector/InspectorController.h
@@ -101,6 +101,10 @@ public:
     WEBCORE_EXPORT void willComposite(Frame&);
     WEBCORE_EXPORT void didComposite(Frame&);
 
+    WEBCORE_EXPORT void pauseWhenShown();
+    WEBCORE_EXPORT void resumeIfPausedInNewWindow();
+    WEBCORE_EXPORT void didShowNewWindow();
+
     bool isUnderTest() const { return m_isUnderTest; }
     void setIsUnderTest(bool isUnderTest) { m_isUnderTest = isUnderTest; }
     WEBCORE_EXPORT void evaluateForTestInFrontend(const String& script);
@@ -150,6 +154,7 @@ private:
     bool m_isAutomaticInspection { false };
     bool m_pauseAfterInitialization = { false };
     bool m_didCreateLazyAgents { false };
+    bool m_pauseWhenShown { false };
 };
 
 } // namespace WebCore
diff --git a/Source/WebCore/inspector/InspectorInstrumentation.cpp b/Source/WebCore/inspector/InspectorInstrumentation.cpp
index 437b3f336c517bec661728e71309eefafa20c892..10689d78a3b2406e4ba97683cbf5711c244d900e 100644
--- a/Source/WebCore/inspector/InspectorInstrumentation.cpp
+++ b/Source/WebCore/inspector/InspectorInstrumentation.cpp
@@ -627,6 +627,12 @@ void InspectorInstrumentation::didFailLoadingImpl(InstrumentingAgents& instrumen
         consoleAgent->didFailLoading(identifier, error); // This should come AFTER resource notification, front-end relies on this.
 }
 
+void InspectorInstrumentation::didReceiveMainResourceErrorImpl(InstrumentingAgents& instrumentingAgents, Frame& frame, const ResourceError&)
+{
+    if (auto* pageRuntimeAgent = instrumentingAgents.enabledPageRuntimeAgent())
+        pageRuntimeAgent->didReceiveMainResourceError(frame);
+}
+
 void InspectorInstrumentation::willLoadXHRSynchronouslyImpl(InstrumentingAgents& instrumentingAgents)
 {
     if (auto* networkAgent = instrumentingAgents.enabledNetworkAgent())
@@ -659,20 +665,17 @@ void InspectorInstrumentation::didReceiveScriptResponseImpl(InstrumentingAgents&
 
 void InspectorInstrumentation::domContentLoadedEventFiredImpl(InstrumentingAgents& instrumentingAgents, Frame& frame)
 {
-    if (!frame.isMainFrame())
-        return;
-
     if (auto* pageAgent = instrumentingAgents.enabledPageAgent())
-        pageAgent->domContentEventFired();
+        pageAgent->domContentEventFired(frame);
 }
 
 void InspectorInstrumentation::loadEventFiredImpl(InstrumentingAgents& instrumentingAgents, Frame* frame)
 {
-    if (!frame || !frame->isMainFrame())
+    if (!frame)
         return;
 
     if (auto* pageAgent = instrumentingAgents.enabledPageAgent())
-        pageAgent->loadEventFired();
+        pageAgent->loadEventFired(*frame);
 }
 
 void InspectorInstrumentation::frameDetachedFromParentImpl(InstrumentingAgents& instrumentingAgents, Frame& frame)
@@ -753,12 +756,6 @@ void InspectorInstrumentation::frameDocumentUpdatedImpl(InstrumentingAgents& ins
         pageDOMDebuggerAgent->frameDocumentUpdated(frame);
 }
 
-void InspectorInstrumentation::loaderDetachedFromFrameImpl(InstrumentingAgents& instrumentingAgents, DocumentLoader& loader)
-{
-    if (auto* inspectorPageAgent = instrumentingAgents.enabledPageAgent())
-        inspectorPageAgent->loaderDetachedFromFrame(loader);
-}
-
 void InspectorInstrumentation::frameStartedLoadingImpl(InstrumentingAgents& instrumentingAgents, Frame& frame)
 {
     if (frame.isMainFrame()) {
@@ -795,6 +792,12 @@ void InspectorInstrumentation::frameClearedScheduledNavigationImpl(Instrumenting
         inspectorPageAgent->frameClearedScheduledNavigation(frame);
 }
 
+void InspectorInstrumentation::didNavigateWithinPageImpl(InstrumentingAgents& instrumentingAgents, Frame& frame)
+{
+    if (InspectorPageAgent* inspectorPageAgent = instrumentingAgents.enabledPageAgent())
+        inspectorPageAgent->didNavigateWithinPage(frame);
+}
+
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
 void InspectorInstrumentation::defaultAppearanceDidChangeImpl(InstrumentingAgents& instrumentingAgents, bool useDarkAppearance)
 {
@@ -1320,6 +1323,36 @@ void InspectorInstrumentation::renderLayerDestroyedImpl(InstrumentingAgents& ins
         layerTreeAgent->renderLayerDestroyed(renderLayer);
 }
 
+void InspectorInstrumentation::runOpenPanelImpl(InstrumentingAgents& instrumentingAgents, HTMLInputElement* element, bool* intercept)
+{
+    if (InspectorPageAgent* pageAgent = instrumentingAgents.enabledPageAgent())
+        pageAgent->runOpenPanel(element, intercept);
+}
+
+void InspectorInstrumentation::frameAttachedImpl(InstrumentingAgents& instrumentingAgents, Frame& frame) {
+    if (InspectorPageAgent* pageAgent = instrumentingAgents.enabledPageAgent())
+        pageAgent->frameAttached(frame);
+}
+
+bool InspectorInstrumentation::shouldBypassCSPImpl(InstrumentingAgents& instrumentingAgents)
+{
+    if (InspectorPageAgent* pageAgent = instrumentingAgents.enabledPageAgent())
+        return pageAgent->shouldBypassCSP();
+    return false;
+}
+
+void InspectorInstrumentation::willCheckNewWindowPolicyImpl(InstrumentingAgents& instrumentingAgents, const URL& url)
+{
+    if (InspectorPageAgent* pageAgent = instrumentingAgents.enabledPageAgent())
+        pageAgent->willCheckNewWindowPolicy(url);
+}
+
+void InspectorInstrumentation::didCheckNewWindowPolicyImpl(InstrumentingAgents& instrumentingAgents, bool allowed)
+{
+    if (InspectorPageAgent* pageAgent = instrumentingAgents.enabledPageAgent())
+        pageAgent->didCheckNewWindowPolicy(allowed);
+}
+
 InstrumentingAgents& InspectorInstrumentation::instrumentingAgents(WorkerOrWorkletGlobalScope& globalScope)
 {
     return globalScope.inspectorController().m_instrumentingAgents;
@@ -1331,6 +1364,13 @@ InstrumentingAgents& InspectorInstrumentation::instrumentingAgents(Page& page)
     return page.inspectorController().m_instrumentingAgents.get();
 }
 
+void InspectorInstrumentation::maybeOverrideDefaultObjectInclusion(Page& page, AccessibilityObjectInclusion& inclusion) {
+    if (InspectorPageAgent* pageAgent = instrumentingAgents(page).enabledPageAgent()) {
+        if (pageAgent->doingAccessibilitySnapshot())
+            inclusion = AccessibilityObjectInclusion::DefaultBehavior;
+    }
+}
+
 InstrumentingAgents* InspectorInstrumentation::instrumentingAgents(ScriptExecutionContext& context)
 {
     if (is<Document>(context))
diff --git a/Source/WebCore/inspector/InspectorInstrumentation.h b/Source/WebCore/inspector/InspectorInstrumentation.h
index 3b00f3125085a72ca2884d2c0389380a4b882bcd..c05decbf1086c0407c9bc6490d9061a9246a96fd 100644
--- a/Source/WebCore/inspector/InspectorInstrumentation.h
+++ b/Source/WebCore/inspector/InspectorInstrumentation.h
@@ -31,6 +31,7 @@
 
 #pragma once
 
+#include "AccessibilityObjectInterface.h"
 #include "CSSSelector.h"
 #include "CallTracerTypes.h"
 #include "CanvasBase.h"
@@ -80,6 +81,7 @@ class DOMWrapperWorld;
 class Document;
 class DocumentLoader;
 class EventListener;
+class HTMLInputElement;
 class HTTPHeaderMap;
 class InspectorTimelineAgent;
 class InstrumentingAgents;
@@ -200,6 +202,7 @@ public:
     static void didReceiveData(Frame*, unsigned long identifier, const char* data, int dataLength, int encodedDataLength);
     static void didFinishLoading(Frame*, DocumentLoader*, unsigned long identifier, const NetworkLoadMetrics&, ResourceLoader*);
     static void didFailLoading(Frame*, DocumentLoader*, unsigned long identifier, const ResourceError&);
+    static void didReceiveMainResourceError(Frame&, const ResourceError&);
 
     static void willSendRequest(WorkerOrWorkletGlobalScope&, unsigned long identifier, ResourceRequest&);
     static void didReceiveResourceResponse(WorkerOrWorkletGlobalScope&, unsigned long identifier, const ResourceResponse&);
@@ -226,11 +229,11 @@ public:
     static void frameDetachedFromParent(Frame&);
     static void didCommitLoad(Frame&, DocumentLoader*);
     static void frameDocumentUpdated(Frame&);
-    static void loaderDetachedFromFrame(Frame&, DocumentLoader&);
     static void frameStartedLoading(Frame&);
     static void frameStoppedLoading(Frame&);
     static void frameScheduledNavigation(Frame&, Seconds delay);
     static void frameClearedScheduledNavigation(Frame&);
+    static void didNavigateWithinPage(Frame&);
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
     static void defaultAppearanceDidChange(Page&, bool useDarkAppearance);
 #endif
@@ -325,6 +328,12 @@ public:
     static void layerTreeDidChange(Page*);
     static void renderLayerDestroyed(Page*, const RenderLayer&);
 
+    static void runOpenPanel(Frame*, HTMLInputElement*, bool*);
+    static void frameAttached(Frame*);
+    static bool shouldBypassCSP(ScriptExecutionContext*);
+    static void willCheckNewWindowPolicy(Frame&, const URL&);
+    static void didCheckNewWindowPolicy(Frame&, bool allowed);
+
     static void frontendCreated();
     static void frontendDeleted();
     static bool hasFrontends() { return InspectorInstrumentationPublic::hasFrontends(); }
@@ -340,6 +349,8 @@ public:
     static void registerInstrumentingAgents(InstrumentingAgents&);
     static void unregisterInstrumentingAgents(InstrumentingAgents&);
 
+    static void maybeOverrideDefaultObjectInclusion(Page&, AccessibilityObjectInclusion&);
+
 private:
     static void didClearWindowObjectInWorldImpl(InstrumentingAgents&, Frame&, DOMWrapperWorld&);
     static bool isDebuggerPausedImpl(InstrumentingAgents&);
@@ -426,6 +437,7 @@ private:
     static void didReceiveDataImpl(InstrumentingAgents&, unsigned long identifier, const char* data, int dataLength, int encodedDataLength);
     static void didFinishLoadingImpl(InstrumentingAgents&, unsigned long identifier, DocumentLoader*, const NetworkLoadMetrics&, ResourceLoader*);
     static void didFailLoadingImpl(InstrumentingAgents&, unsigned long identifier, DocumentLoader*, const ResourceError&);
+    static void didReceiveMainResourceErrorImpl(InstrumentingAgents&, Frame&, const ResourceError&);
     static void willLoadXHRSynchronouslyImpl(InstrumentingAgents&);
     static void didLoadXHRSynchronouslyImpl(InstrumentingAgents&);
     static void scriptImportedImpl(InstrumentingAgents&, unsigned long identifier, const String& sourceString);
@@ -436,11 +448,11 @@ private:
     static void frameDetachedFromParentImpl(InstrumentingAgents&, Frame&);
     static void didCommitLoadImpl(InstrumentingAgents&, Frame&, DocumentLoader*);
     static void frameDocumentUpdatedImpl(InstrumentingAgents&, Frame&);
-    static void loaderDetachedFromFrameImpl(InstrumentingAgents&, DocumentLoader&);
     static void frameStartedLoadingImpl(InstrumentingAgents&, Frame&);
     static void frameStoppedLoadingImpl(InstrumentingAgents&, Frame&);
     static void frameScheduledNavigationImpl(InstrumentingAgents&, Frame&, Seconds delay);
     static void frameClearedScheduledNavigationImpl(InstrumentingAgents&, Frame&);
+    static void didNavigateWithinPageImpl(InstrumentingAgents&, Frame&);
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
     static void defaultAppearanceDidChangeImpl(InstrumentingAgents&, bool useDarkAppearance);
 #endif
@@ -531,6 +543,12 @@ private:
     static void layerTreeDidChangeImpl(InstrumentingAgents&);
     static void renderLayerDestroyedImpl(InstrumentingAgents&, const RenderLayer&);
 
+    static void runOpenPanelImpl(InstrumentingAgents&, HTMLInputElement*, bool*);
+    static void frameAttachedImpl(InstrumentingAgents&, Frame&);
+    static bool shouldBypassCSPImpl(InstrumentingAgents&);
+    static void willCheckNewWindowPolicyImpl(InstrumentingAgents&, const URL&);
+    static void didCheckNewWindowPolicyImpl(InstrumentingAgents&, bool allowed);
+
     static InstrumentingAgents& instrumentingAgents(Page&);
     static InstrumentingAgents& instrumentingAgents(WorkerOrWorkletGlobalScope&);
 
@@ -1119,6 +1137,13 @@ inline void InspectorInstrumentation::didFailLoading(Frame* frame, DocumentLoade
         didFailLoadingImpl(*agents, identifier, loader, error);
 }
 
+inline void InspectorInstrumentation::didReceiveMainResourceError(Frame& frame, const ResourceError& error)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(void());
+    if (auto* agents = instrumentingAgents(frame))
+        didReceiveMainResourceErrorImpl(*agents, frame, error);
+}
+
 inline void InspectorInstrumentation::didFailLoading(WorkerOrWorkletGlobalScope& globalScope, unsigned long identifier, const ResourceError& error)
 {
     didFailLoadingImpl(instrumentingAgents(globalScope), identifier, nullptr, error);
@@ -1214,13 +1239,6 @@ inline void InspectorInstrumentation::frameDocumentUpdated(Frame& frame)
         frameDocumentUpdatedImpl(*agents, frame);
 }
 
-inline void InspectorInstrumentation::loaderDetachedFromFrame(Frame& frame, DocumentLoader& loader)
-{
-    FAST_RETURN_IF_NO_FRONTENDS(void());
-    if (auto* agents = instrumentingAgents(frame))
-        loaderDetachedFromFrameImpl(*agents, loader);
-}
-
 inline void InspectorInstrumentation::frameStartedLoading(Frame& frame)
 {
     FAST_RETURN_IF_NO_FRONTENDS(void());
@@ -1249,6 +1267,13 @@ inline void InspectorInstrumentation::frameClearedScheduledNavigation(Frame& fra
         frameClearedScheduledNavigationImpl(*agents, frame);
 }
 
+inline void InspectorInstrumentation::didNavigateWithinPage(Frame& frame)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(void());
+    if (auto* agents = instrumentingAgents(frame))
+        didNavigateWithinPageImpl(*agents, frame);
+}
+
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
 inline void InspectorInstrumentation::defaultAppearanceDidChange(Page& page, bool useDarkAppearance)
 {
@@ -1723,6 +1748,42 @@ inline void InspectorInstrumentation::renderLayerDestroyed(Page* page, const Ren
         renderLayerDestroyedImpl(*agents, renderLayer);
 }
 
+inline void InspectorInstrumentation::runOpenPanel(Frame* frame, HTMLInputElement* element, bool* intercept)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(void());
+    if (auto* agents = instrumentingAgents(*frame))
+        runOpenPanelImpl(*agents, element, intercept);
+}
+
+inline void InspectorInstrumentation::frameAttached(Frame* frame)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(void());
+    if (auto* agents = instrumentingAgents(frame))
+        frameAttachedImpl(*agents, *frame);
+}
+
+inline bool InspectorInstrumentation::shouldBypassCSP(ScriptExecutionContext* context)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(false);
+    if (auto* agents = instrumentingAgents(context))
+        return shouldBypassCSPImpl(*agents);
+    return false;
+}
+
+inline void InspectorInstrumentation::willCheckNewWindowPolicy(Frame& frame, const URL& url)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(void());
+    if (auto* agents = instrumentingAgents(frame))
+        willCheckNewWindowPolicyImpl(*agents, url);
+}
+
+inline void InspectorInstrumentation::didCheckNewWindowPolicy(Frame& frame, bool allowed)
+{
+    FAST_RETURN_IF_NO_FRONTENDS(void());
+    if (auto* agents = instrumentingAgents(frame))
+        didCheckNewWindowPolicyImpl(*agents, allowed);
+}
+
 inline InstrumentingAgents* InspectorInstrumentation::instrumentingAgents(ScriptExecutionContext* context)
 {
     return context ? instrumentingAgents(*context) : nullptr;
diff --git a/Source/WebCore/inspector/agents/InspectorDOMAgent.cpp b/Source/WebCore/inspector/agents/InspectorDOMAgent.cpp
index 57f4ec4440c8b54a48ca456327c33e4c521685d9..21d25cbb18489691e3c3c57ab84b40410c9c428a 100644
--- a/Source/WebCore/inspector/agents/InspectorDOMAgent.cpp
+++ b/Source/WebCore/inspector/agents/InspectorDOMAgent.cpp
@@ -61,12 +61,16 @@
 #include "Event.h"
 #include "EventListener.h"
 #include "EventNames.h"
+#include "File.h"
+#include "FileList.h"
 #include "Frame.h"
 #include "FrameTree.h"
 #include "FrameView.h"
 #include "FullscreenManager.h"
+#include "FloatQuad.h"
 #include "HTMLElement.h"
 #include "HTMLFrameOwnerElement.h"
+#include "HTMLInputElement.h"
 #include "HTMLMediaElement.h"
 #include "HTMLNames.h"
 #include "HTMLParserIdioms.h"
@@ -92,11 +96,14 @@
 #include "Page.h"
 #include "Pasteboard.h"
 #include "PseudoElement.h"
+#include "RenderLayer.h"
+#include "RenderObject.h"
 #include "RenderStyle.h"
 #include "RenderStyleConstants.h"
 #include "ScriptState.h"
 #include "SelectorChecker.h"
 #include "ShadowRoot.h"
+#include "SharedBuffer.h"
 #include "StaticNodeList.h"
 #include "StyleProperties.h"
 #include "StyleResolver.h"
@@ -128,7 +135,8 @@ using namespace HTMLNames;
 static const size_t maxTextSize = 10000;
 static const UChar ellipsisUChar[] = { 0x2026, 0 };
 
-static Color parseColor(RefPtr<JSON::Object>&& colorObject)
+// static
+Color InspectorDOMAgent::parseColor(RefPtr<JSON::Object>&& colorObject)
 {
     if (!colorObject)
         return Color::transparentBlack;
@@ -147,7 +155,7 @@ static Color parseColor(RefPtr<JSON::Object>&& colorObject)
 
 static Color parseConfigColor(const String& fieldName, JSON::Object& configObject)
 {
-    return parseColor(configObject.getObject(fieldName));
+    return InspectorDOMAgent::parseColor(configObject.getObject(fieldName));
 }
 
 static bool parseQuad(Ref<JSON::Array>&& quadArray, FloatQuad* quad)
@@ -430,6 +438,20 @@ Node* InspectorDOMAgent::assertNode(Protocol::ErrorString& errorString, Protocol
     return node;
 }
 
+Node* InspectorDOMAgent::assertNode(Protocol::ErrorString& errorString, Optional<Protocol::DOM::NodeId>&& nodeId, const String& objectId)
+{
+    Node* node = nullptr;
+    if (nodeId) {
+        node = assertNode(errorString, *nodeId);
+    } else if (!!objectId) {
+        node = nodeForObjectId(objectId);
+        if (!node)
+            errorString = "Missing node for given objectId"_s;
+    } else
+        errorString = "Either nodeId or objectId must be specified"_s;
+    return node;
+}
+
 Document* InspectorDOMAgent::assertDocument(Protocol::ErrorString& errorString, Protocol::DOM::NodeId nodeId)
 {
     Node* node = assertNode(errorString, nodeId);
@@ -1389,16 +1411,7 @@ Protocol::ErrorStringOr<void> InspectorDOMAgent::highlightSelector(Ref<JSON::Obj
 Protocol::ErrorStringOr<void> InspectorDOMAgent::highlightNode(Ref<JSON::Object>&& highlightInspectorObject, Optional<Protocol::DOM::NodeId>&& nodeId, const Protocol::Runtime::RemoteObjectId& objectId)
 {
     Protocol::ErrorString errorString;
-
-    Node* node = nullptr;
-    if (nodeId)
-        node = assertNode(errorString, *nodeId);
-    else if (!!objectId) {
-        node = nodeForObjectId(objectId);
-        errorString = "Missing node for given objectId"_s;
-    } else
-        errorString = "Either nodeId or objectId must be specified"_s;
-
+    Node* node = assertNode(errorString, WTFMove(nodeId), objectId);
     if (!node)
         return makeUnexpected(errorString);
 
@@ -1560,15 +1573,137 @@ Protocol::ErrorStringOr<void> InspectorDOMAgent::setInspectedNode(Protocol::DOM:
     return { };
 }
 
-Protocol::ErrorStringOr<Ref<Protocol::Runtime::RemoteObject>> InspectorDOMAgent::resolveNode(Protocol::DOM::NodeId nodeId, const String& objectGroup)
+static FloatPoint contentsToRootView(FrameView& containingView, const FloatPoint& point)
 {
-    Protocol::ErrorString errorString;
+    return containingView.convertToRootView(point - toFloatSize(containingView.documentScrollPositionRelativeToViewOrigin()));
+}
 
-    Node* node = assertNode(errorString, nodeId);
+static void frameQuadToViewport(FrameView& containingView, FloatQuad& quad, float pageScaleFactor)
+{
+    // Return css (not dip) coordinates by scaling back.
+    quad.setP1(contentsToRootView(containingView, quad.p1()).scaled(1 / pageScaleFactor));
+    quad.setP2(contentsToRootView(containingView, quad.p2()).scaled(1 / pageScaleFactor));
+    quad.setP3(contentsToRootView(containingView, quad.p3()).scaled(1 / pageScaleFactor));
+    quad.setP4(contentsToRootView(containingView, quad.p4()).scaled(1 / pageScaleFactor));
+}
+
+static Ref<Inspector::Protocol::DOM::Quad> buildObjectForQuad(const FloatQuad& quad)
+{
+    auto result = Inspector::Protocol::DOM::Quad::create();
+    result->addItem(quad.p1().x());
+    result->addItem(quad.p1().y());
+    result->addItem(quad.p2().x());
+    result->addItem(quad.p2().y());
+    result->addItem(quad.p3().x());
+    result->addItem(quad.p3().y());
+    result->addItem(quad.p4().x());
+    result->addItem(quad.p4().y());
+    return result;
+}
+
+static Ref<JSON::ArrayOf<Inspector::Protocol::DOM::Quad>> buildArrayOfQuads(const Vector<FloatQuad>& quads)
+{
+    auto result = JSON::ArrayOf<Inspector::Protocol::DOM::Quad>::create();
+    for (const auto& quad : quads)
+        result->addItem(buildObjectForQuad(quad));
+    return result;
+}
+
+Inspector::Protocol::ErrorStringOr<std::tuple<String /* contentFrameId */, String /* ownerFrameId */>> InspectorDOMAgent::describeNode(const String& objectId)
+{
+    Node* node = nodeForObjectId(objectId);
+    if (!node)
+        return makeUnexpected("Node not found"_s);
+
+    auto* pageAgent = m_instrumentingAgents.enabledPageAgent();
+    if (!pageAgent)
+        return makeUnexpected("Page agent must be enabled"_s);
+
+    String ownerFrameId;
+    String frameId = pageAgent->frameId(node->document().frame());
+    if (!frameId.isEmpty())
+        ownerFrameId = frameId;
+
+    String contentFrameId;
+    if (is<HTMLFrameOwnerElement>(*node)) {
+        const auto& frameOwner = downcast<HTMLFrameOwnerElement>(*node);
+        String frameId = pageAgent->frameId(frameOwner.contentFrame());
+        if (!frameId.isEmpty())
+            contentFrameId = frameId;
+    }
+
+    return { { contentFrameId, ownerFrameId } };
+}
+
+Protocol::ErrorStringOr<void> InspectorDOMAgent::scrollIntoViewIfNeeded(const String& objectId, RefPtr<JSON::Object>&& rect)
+{
+    Node* node = nodeForObjectId(objectId);
+    if (!node)
+        return makeUnexpected("Node not found"_s);
+
+    m_inspectedPage.isolatedUpdateRendering();
+    if (!node->isConnected())
+        return makeUnexpected("Node is detached from document"_s);
+
+    RenderObject* renderer = node->renderer();
+    if (!renderer)
+        return makeUnexpected("Node does not have a layout object"_s);
+
+    bool insideFixed;
+    LayoutRect absoluteBounds = renderer->absoluteBoundingBoxRect(true, &insideFixed);
+    if (rect) {
+        Optional<double> x = rect->getDouble("x");
+        Optional<double> y = rect->getDouble("y");
+        Optional<double> width = rect->getDouble("width");
+        Optional<double> height = rect->getDouble("height");
+        if (!x || !y || !width || !height)
+            return makeUnexpected("Malformed rect"_s);
+
+        absoluteBounds.setX(absoluteBounds.x() + LayoutUnit(*x));
+        absoluteBounds.setY(absoluteBounds.y() + LayoutUnit(*y));
+        absoluteBounds.setWidth(LayoutUnit(std::max(*width, 1.0)));
+        absoluteBounds.setHeight(LayoutUnit(std::max(*height, 1.0)));
+    }
+    // Note: we should use ScrollAlignment::alignCenterIfNotVisible, but
+    // RenderLayer insists on no horizontal scroll if enough of the rect is visible.
+    ScrollAlignment alignment = ScrollAlignment::alignCenterAlways;
+    renderer->scrollRectToVisible(absoluteBounds, insideFixed, { SelectionRevealMode::Reveal, alignment, alignment, ShouldAllowCrossOriginScrolling::Yes });
+    return { };
+}
+
+Protocol::ErrorStringOr<Ref<JSON::ArrayOf<Protocol::DOM::Quad>>> InspectorDOMAgent::getContentQuads(const String& objectId)
+{
+    Node* node = nodeForObjectId(objectId);
+    if (!node)
+        return makeUnexpected("Node not found"_s);
+
+    RenderObject* renderer = node->renderer();
+    if (!renderer)
+        return makeUnexpected("Node doesn't have renderer"_s);
+
+    // Ensure quads are up to date.
+    m_inspectedPage.isolatedUpdateRendering();
+
+    Frame* containingFrame = renderer->document().frame();
+    FrameView* containingView = containingFrame ? containingFrame->view() : nullptr;
+    if (!containingView)
+        return makeUnexpected("Internal error: no containing view"_s);
+
+    Vector<FloatQuad> quads;
+    renderer->absoluteQuads(quads);
+    for (auto& quad : quads)
+        frameQuadToViewport(*containingView, quad, m_inspectedPage.pageScaleFactor());
+    return buildArrayOfQuads(quads);
+}
+
+Protocol::ErrorStringOr<Ref<Protocol::Runtime::RemoteObject>> InspectorDOMAgent::resolveNode(Optional<Inspector::Protocol::DOM::NodeId>&& nodeId, const String& objectId, Optional<int>&& contextId, const String& objectGroup)
+{
+    Protocol::ErrorString errorString;
+    Node* node = assertNode(errorString, WTFMove(nodeId), objectId);
     if (!node)
         return makeUnexpected(errorString);
 
-    auto object = resolveNode(node, objectGroup);
+    auto object = resolveNode(node, objectGroup, WTFMove(contextId));
     if (!object)
         return makeUnexpected("Missing injected script for given nodeId"_s);
 
@@ -2759,7 +2894,7 @@ Protocol::ErrorStringOr<Protocol::DOM::NodeId> InspectorDOMAgent::pushNodeByPath
     return makeUnexpected("Missing node for given path"_s);
 }
 
-RefPtr<Protocol::Runtime::RemoteObject> InspectorDOMAgent::resolveNode(Node* node, const String& objectGroup)
+RefPtr<Inspector::Protocol::Runtime::RemoteObject> InspectorDOMAgent::resolveNode(Node* node, const String& objectGroup, Optional<int>&& contextId)
 {
     Document* document = &node->document();
     if (auto* templateHost = document->templateDocumentHost())
@@ -2768,12 +2903,16 @@ RefPtr<Protocol::Runtime::RemoteObject> InspectorDOMAgent::resolveNode(Node* nod
     if (!frame)
         return nullptr;
 
-    auto& state = *mainWorldExecState(frame);
-    auto injectedScript = m_injectedScriptManager.injectedScriptFor(&state);
+    InjectedScript injectedScript;
+    if (contextId) {
+        injectedScript = m_injectedScriptManager.injectedScriptForId(*contextId);
+    } else {
+        injectedScript = m_injectedScriptManager.injectedScriptFor(mainWorldExecState(frame));
+    }
     if (injectedScript.hasNoValue())
         return nullptr;
 
-    return injectedScript.wrapObject(nodeAsScriptValue(state, node), objectGroup);
+    return injectedScript.wrapObject(nodeAsScriptValue(*injectedScript.globalObject(), node), objectGroup);
 }
 
 Node* InspectorDOMAgent::scriptValueAsNode(JSC::JSValue value)
@@ -2796,4 +2935,42 @@ Protocol::ErrorStringOr<void> InspectorDOMAgent::setAllowEditingUserAgentShadowT
     return { };
 }
 
+Protocol::ErrorStringOr<void> InspectorDOMAgent::setInputFiles(const String& objectId, Ref<JSON::Array>&& files) {
+    InjectedScript injectedScript = m_injectedScriptManager.injectedScriptForObjectId(objectId);
+    if (injectedScript.hasNoValue())
+        return makeUnexpected("Can not find element's context for given id"_s);
+
+    Node* node = scriptValueAsNode(injectedScript.findObjectById(objectId));
+    if (!node)
+        return makeUnexpected("Can not find element for given id"_s);
+
+    if (node->nodeType() != Node::ELEMENT_NODE || node->nodeName() != "INPUT")
+        return makeUnexpected("Not an input node"_s);
+
+    HTMLInputElement* element = static_cast<HTMLInputElement*>(node);
+    Vector<Ref<File>> fileObjects;
+    for (unsigned i = 0; i < files->length(); ++i) {
+        RefPtr<JSON::Value> item = files->get(i);
+        RefPtr<JSON::Object> obj = item->asObject();
+        if (!obj)
+            return makeUnexpected("Invalid file payload format"_s);
+
+        String name;
+        String type;
+        String data;
+        if (!obj->getString("name", name) || !obj->getString("type", type) || !obj->getString("data", data))
+            return makeUnexpected("Invalid file payload format"_s);
+
+        Vector<uint8_t> buffer;
+        if (!base64Decode(data, buffer))
+            return makeUnexpected("Unable to decode given content"_s);
+
+        ScriptExecutionContext* context = element->scriptExecutionContext();
+        fileObjects.append(File::create(context, Blob::create(context, SharedBuffer::create(WTFMove(buffer)), type), name));
+    }
+    RefPtr<FileList> fileList = FileList::create(WTFMove(fileObjects));
+    element->setFiles(WTFMove(fileList));
+    return { };
+}
+
 } // namespace WebCore
diff --git a/Source/WebCore/inspector/agents/InspectorDOMAgent.h b/Source/WebCore/inspector/agents/InspectorDOMAgent.h
index 87d6b91ac953d2b9af4b2cbd4270df4932647af3..57a90c4c09ca104b68a3052452747c3dfd15b31c 100644
--- a/Source/WebCore/inspector/agents/InspectorDOMAgent.h
+++ b/Source/WebCore/inspector/agents/InspectorDOMAgent.h
@@ -56,6 +56,7 @@ namespace WebCore {
 
 class AXCoreObject;
 class CharacterData;
+class Color;
 class DOMEditor;
 class Document;
 class Element;
@@ -85,6 +86,7 @@ public:
     static String toErrorString(Exception&&);
 
     static String documentURLString(Document*);
+    static Color parseColor(RefPtr<JSON::Object>&&);
 
     // We represent embedded doms as a part of the same hierarchy. Hence we treat children of frame owners differently.
     // We also skip whitespace text nodes conditionally. Following methods encapsulate these specifics.
@@ -128,7 +130,7 @@ public:
     Inspector::Protocol::ErrorStringOr<std::tuple<String /* searchId */, int /* resultCount */>> performSearch(const String& query, RefPtr<JSON::Array>&& nodeIds, Optional<bool>&& caseSensitive);
     Inspector::Protocol::ErrorStringOr<Ref<JSON::ArrayOf<Inspector::Protocol::DOM::NodeId>>> getSearchResults(const String& searchId, int fromIndex, int toIndex);
     Inspector::Protocol::ErrorStringOr<void> discardSearchResults(const String& searchId);
-    Inspector::Protocol::ErrorStringOr<Ref<Inspector::Protocol::Runtime::RemoteObject>> resolveNode(Inspector::Protocol::DOM::NodeId, const String& objectGroup);
+    Inspector::Protocol::ErrorStringOr<Ref<Inspector::Protocol::Runtime::RemoteObject>> resolveNode(Optional<Inspector::Protocol::DOM::NodeId>&& nodeId, const String& objectId, Optional<int>&& contextId, const String& objectGroup);
     Inspector::Protocol::ErrorStringOr<Ref<JSON::ArrayOf<String>>> getAttributes(Inspector::Protocol::DOM::NodeId);
 #if PLATFORM(IOS_FAMILY)
     Inspector::Protocol::ErrorStringOr<void> setInspectModeEnabled(bool, RefPtr<JSON::Object>&& highlightConfig);
@@ -151,6 +153,10 @@ public:
     Inspector::Protocol::ErrorStringOr<void> focus(Inspector::Protocol::DOM::NodeId);
     Inspector::Protocol::ErrorStringOr<void> setInspectedNode(Inspector::Protocol::DOM::NodeId);
     Inspector::Protocol::ErrorStringOr<void> setAllowEditingUserAgentShadowTrees(bool);
+    Inspector::Protocol::ErrorStringOr<std::tuple<String /* contentFrameId */, String /* ownerFrameId */>> describeNode(const String& objectId);
+    Inspector::Protocol::ErrorStringOr<void> scrollIntoViewIfNeeded(const String& objectId, RefPtr<JSON::Object>&& rect);
+    Inspector::Protocol::ErrorStringOr<Ref<JSON::ArrayOf<Inspector::Protocol::DOM::Quad>>> getContentQuads(const String& objectId);
+    Inspector::Protocol::ErrorStringOr<void> setInputFiles(const String& objectId, Ref<JSON::Array>&& files);
 
     // InspectorInstrumentation
     Inspector::Protocol::DOM::NodeId identifierForNode(Node&);
@@ -188,7 +194,7 @@ public:
     Node* nodeForId(Inspector::Protocol::DOM::NodeId);
     Inspector::Protocol::DOM::NodeId boundNodeId(const Node*);
 
-    RefPtr<Inspector::Protocol::Runtime::RemoteObject> resolveNode(Node*, const String& objectGroup);
+    RefPtr<Inspector::Protocol::Runtime::RemoteObject> resolveNode(Node*, const String& objectGroup, Optional<int>&& contextId);
     bool handleMousePress();
     void mouseDidMoveOverElement(const HitTestResult&, unsigned modifierFlags);
     void inspect(Node*);
@@ -199,12 +205,15 @@ public:
     void reset();
 
     Node* assertNode(Inspector::Protocol::ErrorString&, Inspector::Protocol::DOM::NodeId);
+    Node* assertNode(Inspector::Protocol::ErrorString&, Optional<Inspector::Protocol::DOM::NodeId>&& nodeId, const String& objectId);
     Element* assertElement(Inspector::Protocol::ErrorString&, Inspector::Protocol::DOM::NodeId);
     Document* assertDocument(Inspector::Protocol::ErrorString&, Inspector::Protocol::DOM::NodeId);
 
     RefPtr<JSC::Breakpoint> breakpointForEventListener(EventTarget&, const AtomString& eventType, EventListener&, bool capture);
     Inspector::Protocol::DOM::EventListenerId idForEventListener(EventTarget&, const AtomString& eventType, EventListener&, bool capture);
 
+    Node* nodeForObjectId(const Inspector::Protocol::Runtime::RemoteObjectId&);
+
 private:
 #if ENABLE(VIDEO)
     void mediaMetricsTimerFired();
@@ -233,7 +242,6 @@ private:
     void processAccessibilityChildren(AXCoreObject&, JSON::ArrayOf<Inspector::Protocol::DOM::NodeId>&);
     
     Node* nodeForPath(const String& path);
-    Node* nodeForObjectId(const Inspector::Protocol::Runtime::RemoteObjectId&);
 
     void discardBindings();
 
diff --git a/Source/WebCore/inspector/agents/InspectorDOMStorageAgent.h b/Source/WebCore/inspector/agents/InspectorDOMStorageAgent.h
index 3386cb879f1178c1b9635775c9a0e864f5b94c52..d2350182f5f061855e8ca172779ad60ee73b39fb 100644
--- a/Source/WebCore/inspector/agents/InspectorDOMStorageAgent.h
+++ b/Source/WebCore/inspector/agents/InspectorDOMStorageAgent.h
@@ -40,6 +40,7 @@ class DOMStorageFrontendDispatcher;
 
 namespace WebCore {
 
+class Color;
 class Frame;
 class Page;
 class SecurityOrigin;
diff --git a/Source/WebCore/inspector/agents/InspectorNetworkAgent.cpp b/Source/WebCore/inspector/agents/InspectorNetworkAgent.cpp
index 575382e4390dd31dbf404fc72662b2206071c7e8..d6ec8d26d165b110872dea47fa09a9dfa751f37b 100644
--- a/Source/WebCore/inspector/agents/InspectorNetworkAgent.cpp
+++ b/Source/WebCore/inspector/agents/InspectorNetworkAgent.cpp
@@ -45,6 +45,7 @@
 #include "DocumentThreadableLoader.h"
 #include "FormData.h"
 #include "Frame.h"
+#include "FormData.h"
 #include "FrameLoader.h"
 #include "HTTPHeaderMap.h"
 #include "HTTPHeaderNames.h"
@@ -57,6 +58,7 @@
 #include "MIMETypeRegistry.h"
 #include "MemoryCache.h"
 #include "NetworkResourcesData.h"
+#include "NetworkStateNotifier.h"
 #include "Page.h"
 #include "PlatformStrategies.h"
 #include "ProgressTracker.h"
@@ -355,6 +357,8 @@ RefPtr<Protocol::Network::Response> InspectorNetworkAgent::buildObjectForResourc
         .setSource(responseSource(response.source()))
         .release();
 
+    responseObject->setRequestHeaders(buildObjectForHeaders(response.m_httpRequestHeaderFields));
+
     if (resourceLoader)
         responseObject->setTiming(buildObjectForTiming(response.deprecatedNetworkLoadMetricsOrNull(), *resourceLoader));
 
@@ -490,8 +494,14 @@ static InspectorPageAgent::ResourceType resourceTypeForLoadType(InspectorInstrum
 
 void InspectorNetworkAgent::willSendRequest(unsigned long identifier, DocumentLoader* loader, ResourceRequest& request, const ResourceResponse& redirectResponse)
 {
-    auto* cachedResource = loader ? InspectorPageAgent::cachedResource(loader->frame(), request.url()) : nullptr;
-    willSendRequest(identifier, loader, request, redirectResponse, resourceTypeForCachedResource(cachedResource));
+    InspectorPageAgent::ResourceType resourceType;
+    if (request.initiatorIdentifier() == initiatorIdentifierForEventSource()) {
+      resourceType = InspectorPageAgent::EventSource;
+    } else {
+      auto* cachedResource = loader ? InspectorPageAgent::cachedResource(loader->frame(), request.url()) : nullptr;
+      resourceType = resourceTypeForCachedResource(cachedResource);
+    }
+    willSendRequest(identifier, loader, request, redirectResponse, resourceType);
 }
 
 void InspectorNetworkAgent::willSendRequestOfType(unsigned long identifier, DocumentLoader* loader, ResourceRequest& request, InspectorInstrumentation::LoadType loadType)
@@ -1105,8 +1115,7 @@ bool InspectorNetworkAgent::willIntercept(const ResourceRequest& request)
     if (!m_interceptionEnabled)
         return false;
 
-    return shouldIntercept(request.url(), Protocol::Network::NetworkStage::Request)
-        || shouldIntercept(request.url(), Protocol::Network::NetworkStage::Response);
+    return shouldIntercept(request.url(), Protocol::Network::NetworkStage::Response);
 }
 
 bool InspectorNetworkAgent::shouldInterceptRequest(const ResourceRequest& request)
@@ -1189,6 +1198,9 @@ Protocol::ErrorStringOr<void> InspectorNetworkAgent::interceptWithRequest(const
         return makeUnexpected("Missing pending intercept request for given requestId"_s);
 
     auto& loader = *pendingRequest->m_loader;
+    if (loader.reachedTerminalState())
+        return makeUnexpected("Unable to intercept request, it has already been processed"_s);
+
     ResourceRequest request = loader.request();
     if (!!url)
         request.setURL(URL({ }, url));
@@ -1292,6 +1304,8 @@ Protocol::ErrorStringOr<void> InspectorNetworkAgent::interceptRequestWithRespons
     response.setHTTPHeaderFields(WTFMove(explicitHeaders));
     response.setHTTPHeaderField(HTTPHeaderName::ContentType, response.mimeType());
     loader->didReceiveResponse(response, [loader, buffer = data.releaseNonNull()]() mutable {
+        if (loader->reachedTerminalState())
+            return;
         if (buffer->size())
             loader->didReceiveBuffer(WTFMove(buffer), buffer->size(), DataPayloadWholeResource);
         loader->didFinishLoading(NetworkLoadMetrics());
@@ -1332,6 +1346,12 @@ Protocol::ErrorStringOr<void> InspectorNetworkAgent::interceptRequestWithError(c
     return { };
 }
 
+Inspector::Protocol::ErrorStringOr<void> InspectorNetworkAgent::setEmulateOfflineState(bool offline)
+{
+    platformStrategies()->loaderStrategy()->setEmulateOfflineState(offline);
+    return { };
+}
+
 bool InspectorNetworkAgent::shouldTreatAsText(const String& mimeType)
 {
     return startsWithLettersIgnoringASCIICase(mimeType, "text/")
@@ -1373,6 +1393,12 @@ Optional<String> InspectorNetworkAgent::textContentForCachedResource(CachedResou
     return WTF::nullopt;
 }
 
+// static
+String InspectorNetworkAgent::initiatorIdentifierForEventSource()
+{
+    return "InspectorNetworkAgent: eventSource"_s;
+}
+
 bool InspectorNetworkAgent::cachedResourceContent(CachedResource& resource, String* result, bool* base64Encoded)
 {
     ASSERT(result);
diff --git a/Source/WebCore/inspector/agents/InspectorNetworkAgent.h b/Source/WebCore/inspector/agents/InspectorNetworkAgent.h
index 933601761667417ebe5de301586869ccc64fc3da..f63a95c3c45980d5606971b83881e8245df11403 100644
--- a/Source/WebCore/inspector/agents/InspectorNetworkAgent.h
+++ b/Source/WebCore/inspector/agents/InspectorNetworkAgent.h
@@ -71,6 +71,7 @@ public:
     static Ref<TextResourceDecoder> createTextDecoder(const String& mimeType, const String& textEncodingName);
     static Optional<String> textContentForCachedResource(CachedResource&);
     static bool cachedResourceContent(CachedResource&, String* result, bool* base64Encoded);
+    static String initiatorIdentifierForEventSource();
 
     // InspectorAgentBase
     void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) final;
@@ -93,6 +94,7 @@ public:
     Inspector::Protocol::ErrorStringOr<void> interceptWithResponse(const Inspector::Protocol::Network::RequestId&, const String& content, bool base64Encoded, const String& mimeType, Optional<int>&& status, const String& statusText, RefPtr<JSON::Object>&& headers) final;
     Inspector::Protocol::ErrorStringOr<void> interceptRequestWithResponse(const Inspector::Protocol::Network::RequestId&, const String& content, bool base64Encoded, const String& mimeType, int status, const String& statusText, Ref<JSON::Object>&& headers) final;
     Inspector::Protocol::ErrorStringOr<void> interceptRequestWithError(const Inspector::Protocol::Network::RequestId&, Inspector::Protocol::Network::ResourceErrorType) final;
+    Inspector::Protocol::ErrorStringOr<void> setEmulateOfflineState(bool offline) final;
 
     // InspectorInstrumentation
     void willRecalculateStyle();
diff --git a/Source/WebCore/inspector/agents/InspectorPageAgent.cpp b/Source/WebCore/inspector/agents/InspectorPageAgent.cpp
index af0a051bdae52b2daf70b1fee76eee0866b7b046..b8a55168af379e51a62ffd8181b70f1ddeec40bc 100644
--- a/Source/WebCore/inspector/agents/InspectorPageAgent.cpp
+++ b/Source/WebCore/inspector/agents/InspectorPageAgent.cpp
@@ -32,19 +32,25 @@
 #include "config.h"
 #include "InspectorPageAgent.h"
 
+#include "AXObjectCache.h"
+#include "BackForwardController.h"
 #include "CachedResource.h"
 #include "CachedResourceLoader.h"
 #include "Cookie.h"
 #include "CookieJar.h"
+#include "CustomHeaderFields.h"
 #include "DOMWrapperWorld.h"
 #include "Document.h"
 #include "DocumentLoader.h"
+#include "FocusController.h"
 #include "Frame.h"
 #include "FrameLoadRequest.h"
 #include "FrameLoader.h"
+#include "FrameLoaderClient.h"
 #include "FrameSnapshotting.h"
 #include "FrameView.h"
 #include "HTMLFrameOwnerElement.h"
+#include "HTMLInputElement.h"
 #include "HTMLNames.h"
 #include "ImageBuffer.h"
 #include "InspectorClient.h"
@@ -55,19 +61,28 @@
 #include "MIMETypeRegistry.h"
 #include "MemoryCache.h"
 #include "Page.h"
+#include "PageRuntimeAgent.h"
 #include "RenderObject.h"
 #include "RenderTheme.h"
+#include "RuntimeEnabledFeatures.h"
 #include "ScriptController.h"
 #include "ScriptSourceCode.h"
+#include "ScriptState.h"
 #include "SecurityOrigin.h"
 #include "Settings.h"
 #include "StyleScope.h"
 #include "TextEncoding.h"
+#include "TypingCommand.h"
 #include "UserGestureIndicator.h"
 #include <JavaScriptCore/ContentSearchUtilities.h>
 #include <JavaScriptCore/IdentifiersFactory.h>
+#include <JavaScriptCore/InjectedScriptManager.h>
 #include <JavaScriptCore/RegularExpression.h>
+#include <wtf/DateMath.h>
 #include <wtf/ListHashSet.h>
+#include <wtf/NeverDestroyed.h>
+#include <wtf/Ref.h>
+#include <wtf/RefPtr.h>
 #include <wtf/Stopwatch.h>
 #include <wtf/text/Base64.h>
 #include <wtf/text/StringBuilder.h>
@@ -80,11 +95,15 @@
 #include "LegacyWebArchive.h"
 #endif
 
-
 namespace WebCore {
 
 using namespace Inspector;
 
+static HashMap<String, Ref<DOMWrapperWorld>>& createdUserWorlds() {
+    static NeverDestroyed<HashMap<String, Ref<DOMWrapperWorld>>> nameToWorld;
+    return nameToWorld;
+}
+
 static bool decodeBuffer(const char* buffer, unsigned size, const String& textEncodingName, String* result)
 {
     if (buffer) {
@@ -234,6 +253,8 @@ Protocol::Page::ResourceType InspectorPageAgent::resourceTypeJSON(InspectorPageA
         return Protocol::Page::ResourceType::Beacon;
     case WebSocketResource:
         return Protocol::Page::ResourceType::WebSocket;
+    case EventSource:
+        return Protocol::Page::ResourceType::EventSource;
     case OtherResource:
         return Protocol::Page::ResourceType::Other;
 #if ENABLE(APPLICATION_MANIFEST)
@@ -321,6 +342,7 @@ InspectorPageAgent::InspectorPageAgent(PageAgentContext& context, InspectorClien
     , m_frontendDispatcher(makeUnique<Inspector::PageFrontendDispatcher>(context.frontendRouter))
     , m_backendDispatcher(Inspector::PageBackendDispatcher::create(context.backendDispatcher, this))
     , m_inspectedPage(context.inspectedPage)
+    , m_injectedScriptManager(context.injectedScriptManager)
     , m_client(client)
     , m_overlay(overlay)
 {
@@ -352,12 +374,20 @@ Protocol::ErrorStringOr<void> InspectorPageAgent::enable()
     defaultAppearanceDidChange(m_inspectedPage.defaultUseDarkAppearance());
 #endif
 
+    if (!createdUserWorlds().isEmpty()) {
+        Vector<DOMWrapperWorld*> worlds;
+        for (const auto& world : createdUserWorlds().values())
+            worlds.append(world.ptr());
+        ensureUserWorldsExistInAllFrames(worlds);
+    }
     return { };
 }
 
 Protocol::ErrorStringOr<void> InspectorPageAgent::disable()
 {
     m_instrumentingAgents.setEnabledPageAgent(nullptr);
+    m_interceptFileChooserDialog = false;
+    m_bypassCSP = false;
 
     setShowPaintRects(false);
 #if !PLATFORM(IOS_FAMILY)
@@ -406,6 +436,22 @@ Protocol::ErrorStringOr<void> InspectorPageAgent::reload(Optional<bool>&& ignore
     return { };
 }
 
+Protocol::ErrorStringOr<void> InspectorPageAgent::goBack()
+{
+    if (!m_inspectedPage.backForward().goBack())
+        return makeUnexpected("Failed to go back"_s);
+
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::goForward()
+{
+    if (!m_inspectedPage.backForward().goForward())
+        return makeUnexpected("Failed to go forward"_s);
+
+    return { };
+}
+
 Protocol::ErrorStringOr<void> InspectorPageAgent::navigate(const String& url)
 {
     UserGestureIndicator indicator { ProcessingUserGesture };
@@ -801,15 +847,16 @@ Protocol::ErrorStringOr<void> InspectorPageAgent::setShowPaintRects(bool show)
     return { };
 }
 
-void InspectorPageAgent::domContentEventFired()
+void InspectorPageAgent::domContentEventFired(Frame& frame)
 {
-    m_isFirstLayoutAfterOnLoad = true;
-    m_frontendDispatcher->domContentEventFired(timestamp());
+    if (frame.isMainFrame())
+        m_isFirstLayoutAfterOnLoad = true;
+    m_frontendDispatcher->domContentEventFired(timestamp(), frameId(&frame));
 }
 
-void InspectorPageAgent::loadEventFired()
+void InspectorPageAgent::loadEventFired(Frame& frame)
 {
-    m_frontendDispatcher->loadEventFired(timestamp());
+    m_frontendDispatcher->loadEventFired(timestamp(), frameId(&frame));
 }
 
 void InspectorPageAgent::frameNavigated(Frame& frame)
@@ -817,13 +864,23 @@ void InspectorPageAgent::frameNavigated(Frame& frame)
     m_frontendDispatcher->frameNavigated(buildObjectForFrame(&frame));
 }
 
+String InspectorPageAgent::makeFrameID(ProcessIdentifier processID,  FrameIdentifier frameID)
+{
+    return makeString(processID.toUInt64(), ".", frameID.toUInt64());
+}
+
+static String globalIDForFrame(Frame& frame)
+{
+    return InspectorPageAgent::makeFrameID(Process::identifier(), *frame.loader().client().frameID());
+}
+
 void InspectorPageAgent::frameDetached(Frame& frame)
 {
-    auto identifier = m_frameToIdentifier.take(&frame);
-    if (identifier.isNull())
+    String identifier = globalIDForFrame(frame);
+    if (!m_identifierToFrame.take(identifier))
         return;
+
     m_frontendDispatcher->frameDetached(identifier);
-    m_identifierToFrame.remove(identifier);
 }
 
 Frame* InspectorPageAgent::frameForId(const Protocol::Network::FrameId& frameId)
@@ -835,20 +892,18 @@ String InspectorPageAgent::frameId(Frame* frame)
 {
     if (!frame)
         return emptyString();
-    return m_frameToIdentifier.ensure(frame, [this, frame] {
-        auto identifier = IdentifiersFactory::createIdentifier();
-        m_identifierToFrame.set(identifier, makeWeakPtr(frame));
-        return identifier;
-    }).iterator->value;
+
+    String identifier = globalIDForFrame(*frame);
+    m_identifierToFrame.set(identifier, makeWeakPtr(frame));
+    return identifier;
 }
 
 String InspectorPageAgent::loaderId(DocumentLoader* loader)
 {
     if (!loader)
         return emptyString();
-    return m_loaderToIdentifier.ensure(loader, [] {
-        return IdentifiersFactory::createIdentifier();
-    }).iterator->value;
+
+    return String::number(loader->loaderIDForInspector());
 }
 
 Frame* InspectorPageAgent::assertFrame(Protocol::ErrorString& errorString, const Protocol::Network::FrameId& frameId)
@@ -859,11 +914,6 @@ Frame* InspectorPageAgent::assertFrame(Protocol::ErrorString& errorString, const
     return frame;
 }
 
-void InspectorPageAgent::loaderDetachedFromFrame(DocumentLoader& loader)
-{
-    m_loaderToIdentifier.remove(&loader);
-}
-
 void InspectorPageAgent::frameStartedLoading(Frame& frame)
 {
     m_frontendDispatcher->frameStartedLoading(frameId(&frame));
@@ -884,6 +934,12 @@ void InspectorPageAgent::frameClearedScheduledNavigation(Frame& frame)
     m_frontendDispatcher->frameClearedScheduledNavigation(frameId(&frame));
 }
 
+void InspectorPageAgent::didNavigateWithinPage(Frame& frame)
+{
+    String url = frame.document()->url().string();
+    m_frontendDispatcher->navigatedWithinDocument(frameId(&frame), url);
+}
+
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
 void InspectorPageAgent::defaultAppearanceDidChange(bool useDarkAppearance)
 {
@@ -943,6 +999,52 @@ void InspectorPageAgent::didRecalculateStyle()
     m_overlay->update();
 }
 
+void InspectorPageAgent::runOpenPanel(HTMLInputElement* element, bool* intercept)
+{
+    if (m_interceptFileChooserDialog) {
+        *intercept = true;
+    } else {
+        return;
+    }
+    Document& document = element->document();
+    auto* frame =  document.frame();
+    if (!frame)
+        return;
+
+    auto& state = *mainWorldExecState(frame);
+    auto injectedScript = m_injectedScriptManager.injectedScriptFor(&state);
+    if (injectedScript.hasNoValue())
+        return;
+
+    auto object = injectedScript.wrapObject(InspectorDOMAgent::nodeAsScriptValue(state, element), WTF::String());
+    if (!object)
+        return;
+
+    m_frontendDispatcher->fileChooserOpened(frameId(frame), object.releaseNonNull());
+}
+
+void InspectorPageAgent::frameAttached(Frame& frame)
+{
+    Frame* parent = frame.tree().parent();
+    String parentFrameId = frameId(parent);
+    m_frontendDispatcher->frameAttached(frameId(&frame), parentFrameId);
+}
+
+bool InspectorPageAgent::shouldBypassCSP()
+{
+    return m_bypassCSP;
+}
+
+void InspectorPageAgent::willCheckNewWindowPolicy(const URL& url)
+{
+    m_frontendDispatcher->willRequestOpenWindow(url.string());
+}
+
+void InspectorPageAgent::didCheckNewWindowPolicy(bool allowed)
+{
+    m_frontendDispatcher->didRequestOpenWindow(allowed);
+}
+
 Ref<Protocol::Page::Frame> InspectorPageAgent::buildObjectForFrame(Frame* frame)
 {
     ASSERT_ARG(frame, frame);
@@ -1094,6 +1196,27 @@ Protocol::ErrorStringOr<String> InspectorPageAgent::snapshotRect(int x, int y, i
     return snapshot->toDataURL("image/png"_s, WTF::nullopt, PreserveResolution::Yes);
 }
 
+Protocol::ErrorStringOr<void> InspectorPageAgent::setTimeZone(const String& timeZone)
+{
+    bool success = WTF::setTimeZoneForAutomation(timeZone);
+    if (!success)
+        return makeUnexpected("Invalid time zone " + timeZone);
+
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::setTouchEmulationEnabled(bool enabled)
+{
+#if ENABLE(TOUCH_EVENTS)
+    RuntimeEnabledFeatures::sharedFeatures().setTouchEventsEnabled(enabled);
+    return { };
+#else
+    UNUSED_PARAM(enabled);
+    return makeUnexpected("Not supported"_s);
+#endif
+}
+
+
 #if ENABLE(WEB_ARCHIVE) && USE(CF)
 Protocol::ErrorStringOr<String> InspectorPageAgent::archive()
 {
@@ -1106,7 +1229,6 @@ Protocol::ErrorStringOr<String> InspectorPageAgent::archive()
 }
 #endif
 
-#if !PLATFORM(COCOA)
 Protocol::ErrorStringOr<void> InspectorPageAgent::setScreenSizeOverride(Optional<int>&& width, Optional<int>&& height)
 {
     if (width.hasValue() != height.hasValue())
@@ -1121,6 +1243,533 @@ Protocol::ErrorStringOr<void> InspectorPageAgent::setScreenSizeOverride(Optional
     m_inspectedPage.mainFrame().setOverrideScreenSize(FloatSize(width.valueOr(0), height.valueOr(0)));
     return { };
 }
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::insertText(const String& text)
+{
+    UserGestureIndicator indicator { ProcessingUserGesture };
+    Document* focusedDocument = m_inspectedPage.focusController().focusedOrMainFrame().document();
+    TypingCommand::insertText(*focusedDocument, text, 0);
+    return { };
+}
+
+static String roleFromObject(RefPtr<AXCoreObject> axObject)
+{
+    String computedRoleString = axObject->computedRoleString();
+    if (!computedRoleString.isEmpty())
+        return computedRoleString;
+    AccessibilityRole role = axObject->roleValue();
+    switch(role) {
+        case AccessibilityRole::Annotation:
+            return "Annotation";
+        case AccessibilityRole::Application:
+            return "Application";
+        case AccessibilityRole::ApplicationAlert:
+            return "ApplicationAlert";
+        case AccessibilityRole::ApplicationAlertDialog:
+            return "ApplicationAlertDialog";
+        case AccessibilityRole::ApplicationDialog:
+            return "ApplicationDialog";
+        case AccessibilityRole::ApplicationGroup:
+            return "ApplicationGroup";
+        case AccessibilityRole::ApplicationLog:
+            return "ApplicationLog";
+        case AccessibilityRole::ApplicationMarquee:
+            return "ApplicationMarquee";
+        case AccessibilityRole::ApplicationStatus:
+            return "ApplicationStatus";
+        case AccessibilityRole::ApplicationTextGroup:
+            return "ApplicationTextGroup";
+        case AccessibilityRole::ApplicationTimer:
+            return "ApplicationTimer";
+        case AccessibilityRole::Audio:
+            return "Audio";
+        case AccessibilityRole::Blockquote:
+            return "Blockquote";
+        case AccessibilityRole::Browser:
+            return "Browser";
+        case AccessibilityRole::BusyIndicator:
+            return "BusyIndicator";
+        case AccessibilityRole::Button:
+            return "Button";
+        case AccessibilityRole::Canvas:
+            return "Canvas";
+        case AccessibilityRole::Caption:
+            return "Caption";
+        case AccessibilityRole::Cell:
+            return "Cell";
+        case AccessibilityRole::CheckBox:
+            return "CheckBox";
+        case AccessibilityRole::ColorWell:
+            return "ColorWell";
+        case AccessibilityRole::Column:
+            return "Column";
+        case AccessibilityRole::ColumnHeader:
+            return "ColumnHeader";
+        case AccessibilityRole::ComboBox:
+            return "ComboBox";
+        case AccessibilityRole::Definition:
+            return "Definition";
+        case AccessibilityRole::Deletion:
+            return "Deletion";
+        case AccessibilityRole::DescriptionList:
+            return "DescriptionList";
+        case AccessibilityRole::DescriptionListTerm:
+            return "DescriptionListTerm";
+        case AccessibilityRole::DescriptionListDetail:
+            return "DescriptionListDetail";
+        case AccessibilityRole::Details:
+            return "Details";
+        case AccessibilityRole::Directory:
+            return "Directory";
+        case AccessibilityRole::DisclosureTriangle:
+            return "DisclosureTriangle";
+        case AccessibilityRole::Div:
+            return "Div";
+        case AccessibilityRole::Document:
+            return "Document";
+        case AccessibilityRole::DocumentArticle:
+            return "DocumentArticle";
+        case AccessibilityRole::DocumentMath:
+            return "DocumentMath";
+        case AccessibilityRole::DocumentNote:
+            return "DocumentNote";
+        case AccessibilityRole::Drawer:
+            return "Drawer";
+        case AccessibilityRole::EditableText:
+            return "EditableText";
+        case AccessibilityRole::Feed:
+            return "Feed";
+        case AccessibilityRole::Figure:
+            return "Figure";
+        case AccessibilityRole::Footer:
+            return "Footer";
+        case AccessibilityRole::Footnote:
+            return "Footnote";
+        case AccessibilityRole::Form:
+            return "Form";
+        case AccessibilityRole::GraphicsDocument:
+            return "GraphicsDocument";
+        case AccessibilityRole::GraphicsObject:
+            return "GraphicsObject";
+        case AccessibilityRole::GraphicsSymbol:
+            return "GraphicsSymbol";
+        case AccessibilityRole::Grid:
+            return "Grid";
+        case AccessibilityRole::GridCell:
+            return "GridCell";
+        case AccessibilityRole::Group:
+            return "Group";
+        case AccessibilityRole::GrowArea:
+            return "GrowArea";
+        case AccessibilityRole::Heading:
+            return "Heading";
+        case AccessibilityRole::HelpTag:
+            return "HelpTag";
+        case AccessibilityRole::HorizontalRule:
+            return "HorizontalRule";
+        case AccessibilityRole::Ignored:
+            return "Ignored";
+        case AccessibilityRole::Inline:
+            return "Inline";
+        case AccessibilityRole::Image:
+            return "Image";
+        case AccessibilityRole::ImageMap:
+            return "ImageMap";
+        case AccessibilityRole::ImageMapLink:
+            return "ImageMapLink";
+        case AccessibilityRole::Incrementor:
+            return "Incrementor";
+        case AccessibilityRole::Insertion:
+            return "Insertion";
+        case AccessibilityRole::Label:
+            return "Label";
+        case AccessibilityRole::LandmarkBanner:
+            return "LandmarkBanner";
+        case AccessibilityRole::LandmarkComplementary:
+            return "LandmarkComplementary";
+        case AccessibilityRole::LandmarkContentInfo:
+            return "LandmarkContentInfo";
+        case AccessibilityRole::LandmarkDocRegion:
+            return "LandmarkDocRegion";
+        case AccessibilityRole::LandmarkMain:
+            return "LandmarkMain";
+        case AccessibilityRole::LandmarkNavigation:
+            return "LandmarkNavigation";
+        case AccessibilityRole::LandmarkRegion:
+            return "LandmarkRegion";
+        case AccessibilityRole::LandmarkSearch:
+            return "LandmarkSearch";
+        case AccessibilityRole::Legend:
+            return "Legend";
+        case AccessibilityRole::Link:
+            return "Link";
+        case AccessibilityRole::List:
+            return "List";
+        case AccessibilityRole::ListBox:
+            return "ListBox";
+        case AccessibilityRole::ListBoxOption:
+            return "ListBoxOption";
+        case AccessibilityRole::ListItem:
+            return "ListItem";
+        case AccessibilityRole::ListMarker:
+            return "ListMarker";
+        case AccessibilityRole::Mark:
+            return "Mark";
+        case AccessibilityRole::MathElement:
+            return "MathElement";
+        case AccessibilityRole::Matte:
+            return "Matte";
+        case AccessibilityRole::Menu:
+            return "Menu";
+        case AccessibilityRole::MenuBar:
+            return "MenuBar";
+        case AccessibilityRole::MenuButton:
+            return "MenuButton";
+        case AccessibilityRole::MenuItem:
+            return "MenuItem";
+        case AccessibilityRole::MenuItemCheckbox:
+            return "MenuItemCheckbox";
+        case AccessibilityRole::MenuItemRadio:
+            return "MenuItemRadio";
+        case AccessibilityRole::MenuListPopup:
+            return "MenuListPopup";
+        case AccessibilityRole::MenuListOption:
+            return "MenuListOption";
+        case AccessibilityRole::Meter:
+            return "Meter";
+        case AccessibilityRole::Outline:
+            return "Outline";
+        case AccessibilityRole::Paragraph:
+            return "Paragraph";
+        case AccessibilityRole::PopUpButton:
+            return "PopUpButton";
+        case AccessibilityRole::Pre:
+            return "Pre";
+        case AccessibilityRole::Presentational:
+            return "Presentational";
+        case AccessibilityRole::ProgressIndicator:
+            return "ProgressIndicator";
+        case AccessibilityRole::RadioButton:
+            return "RadioButton";
+        case AccessibilityRole::RadioGroup:
+            return "RadioGroup";
+        case AccessibilityRole::RowHeader:
+            return "RowHeader";
+        case AccessibilityRole::Row:
+            return "Row";
+        case AccessibilityRole::RowGroup:
+            return "RowGroup";
+        case AccessibilityRole::RubyBase:
+            return "RubyBase";
+        case AccessibilityRole::RubyBlock:
+            return "RubyBlock";
+        case AccessibilityRole::RubyInline:
+            return "RubyInline";
+        case AccessibilityRole::RubyRun:
+            return "RubyRun";
+        case AccessibilityRole::RubyText:
+            return "RubyText";
+        case AccessibilityRole::Ruler:
+            return "Ruler";
+        case AccessibilityRole::RulerMarker:
+            return "RulerMarker";
+        case AccessibilityRole::ScrollArea:
+            return "ScrollArea";
+        case AccessibilityRole::ScrollBar:
+            return "ScrollBar";
+        case AccessibilityRole::SearchField:
+            return "SearchField";
+        case AccessibilityRole::Sheet:
+            return "Sheet";
+        case AccessibilityRole::Slider:
+            return "Slider";
+        case AccessibilityRole::SliderThumb:
+            return "SliderThumb";
+        case AccessibilityRole::SpinButton:
+            return "SpinButton";
+        case AccessibilityRole::SpinButtonPart:
+            return "SpinButtonPart";
+        case AccessibilityRole::SplitGroup:
+            return "SplitGroup";
+        case AccessibilityRole::Splitter:
+            return "Splitter";
+        case AccessibilityRole::StaticText:
+            return "StaticText";
+        case AccessibilityRole::Subscript:
+            return "Subscript";
+        case AccessibilityRole::Summary:
+            return "Summary";
+        case AccessibilityRole::Superscript:
+            return "Superscript";
+        case AccessibilityRole::Switch:
+            return "Switch";
+        case AccessibilityRole::SystemWide:
+            return "SystemWide";
+        case AccessibilityRole::SVGRoot:
+            return "SVGRoot";
+        case AccessibilityRole::SVGText:
+            return "SVGText";
+        case AccessibilityRole::SVGTSpan:
+            return "SVGTSpan";
+        case AccessibilityRole::SVGTextPath:
+            return "SVGTextPath";
+        case AccessibilityRole::TabGroup:
+            return "TabGroup";
+        case AccessibilityRole::TabList:
+            return "TabList";
+        case AccessibilityRole::TabPanel:
+            return "TabPanel";
+        case AccessibilityRole::Tab:
+            return "Tab";
+        case AccessibilityRole::Table:
+            return "Table";
+        case AccessibilityRole::TableHeaderContainer:
+            return "TableHeaderContainer";
+        case AccessibilityRole::TextArea:
+            return "TextArea";
+        case AccessibilityRole::TextGroup:
+            return "TextGroup";
+        case AccessibilityRole::Term:
+            return "Term";
+        case AccessibilityRole::Time:
+            return "Time";
+        case AccessibilityRole::Tree:
+            return "Tree";
+        case AccessibilityRole::TreeGrid:
+            return "TreeGrid";
+        case AccessibilityRole::TreeItem:
+            return "TreeItem";
+        case AccessibilityRole::TextField:
+            return "TextField";
+        case AccessibilityRole::ToggleButton:
+            return "ToggleButton";
+        case AccessibilityRole::Toolbar:
+            return "Toolbar";
+        case AccessibilityRole::Unknown:
+            return "Unknown";
+        case AccessibilityRole::UserInterfaceTooltip:
+            return "UserInterfaceTooltip";
+        case AccessibilityRole::ValueIndicator:
+            return "ValueIndicator";
+        case AccessibilityRole::Video:
+            return "Video";
+        case AccessibilityRole::WebApplication:
+            return "WebApplication";
+        case AccessibilityRole::WebArea:
+            return "WebArea";
+        case AccessibilityRole::WebCoreLink:
+            return "WebCoreLink";
+        case AccessibilityRole::Window:
+            return "Window";
+    };
+    return "Unknown";
+}
+
+static Ref<Inspector::Protocol::Page::AXNode> snapshotForAXObject(RefPtr<AXCoreObject> axObject, Node* nodeToFind)
+{
+    auto axNode = Inspector::Protocol::Page::AXNode::create()
+        .setRole(roleFromObject(axObject))
+        .release();
+
+    if (!axObject->computedLabel().isEmpty())
+        axNode->setName(axObject->computedLabel());
+    if (!axObject->stringValue().isEmpty())
+        axNode->setValue(JSON::Value::create(axObject->stringValue()));
+    if (!axObject->accessibilityDescription().isEmpty())
+        axNode->setDescription(axObject->accessibilityDescription());
+    if (!axObject->keyShortcutsValue().isEmpty())
+        axNode->setKeyshortcuts(axObject->keyShortcutsValue());
+    if (!axObject->valueDescription().isEmpty())
+        axNode->setValuetext(axObject->valueDescription());
+    if (!axObject->roleDescription().isEmpty())
+        axNode->setRoledescription(axObject->roleDescription());
+    if (!axObject->isEnabled())
+        axNode->setDisabled(!axObject->isEnabled());
+    if (axObject->supportsExpanded())
+        axNode->setExpanded(axObject->isExpanded());
+    if (axObject->isFocused())
+        axNode->setFocused(axObject->isFocused());
+    if (axObject->isModalNode())
+        axNode->setModal(axObject->isModalNode());
+    bool multiline = axObject->ariaIsMultiline() || axObject->roleValue() == AccessibilityRole::TextArea;
+    if (multiline)
+        axNode->setMultiline(multiline);
+    if (axObject->isMultiSelectable())
+        axNode->setMultiselectable(axObject->isMultiSelectable());
+    if (axObject->supportsReadOnly() && !axObject->canSetValueAttribute() && axObject->isEnabled())
+        axNode->setReadonly(true);
+    if (axObject->supportsRequiredAttribute())
+        axNode->setRequired(axObject->isRequired());
+    if (axObject->isSelected())
+        axNode->setSelected(axObject->isSelected());
+    if (axObject->supportsChecked()) {
+        AccessibilityButtonState checkedState = axObject->checkboxOrRadioValue();
+        switch (checkedState) {
+            case AccessibilityButtonState::On:
+                axNode->setChecked(Inspector::Protocol::Page::AXNode::Checked::True);
+                break;
+            case AccessibilityButtonState::Off:
+                axNode->setChecked(Inspector::Protocol::Page::AXNode::Checked::False);
+                break;
+            case AccessibilityButtonState::Mixed:
+                axNode->setChecked(Inspector::Protocol::Page::AXNode::Checked::Mixed);
+                break;
+        }
+    }
+    if (axObject->supportsPressed()) {
+        AccessibilityButtonState checkedState = axObject->checkboxOrRadioValue();
+        switch (checkedState) {
+            case AccessibilityButtonState::On:
+                axNode->setPressed(Inspector::Protocol::Page::AXNode::Pressed::True);
+                break;
+            case AccessibilityButtonState::Off:
+                axNode->setPressed(Inspector::Protocol::Page::AXNode::Pressed::False);
+                break;
+            case AccessibilityButtonState::Mixed:
+                axNode->setPressed(Inspector::Protocol::Page::AXNode::Pressed::Mixed);
+                break;
+        }
+    }
+    unsigned level = axObject->hierarchicalLevel() ? axObject->hierarchicalLevel() : axObject->headingLevel();
+    if (level)
+        axNode->setLevel(level);
+    if (axObject->minValueForRange() != 0)
+        axNode->setValuemin(axObject->minValueForRange());
+    if (axObject->maxValueForRange() != 0)
+        axNode->setValuemax(axObject->maxValueForRange());
+    if (axObject->supportsAutoComplete())
+        axNode->setAutocomplete(axObject->autoCompleteValue());
+    if (axObject->hasPopup())
+        axNode->setHaspopup(axObject->popupValue());
+
+    String invalidValue = axObject->invalidStatus();
+    if (invalidValue != "false") {
+        if (invalidValue == "grammar")
+            axNode->setInvalid(Inspector::Protocol::Page::AXNode::Invalid::Grammar);
+        else if (invalidValue == "spelling")
+            axNode->setInvalid(Inspector::Protocol::Page::AXNode::Invalid::Spelling);
+        else // Future versions of ARIA may allow additional truthy values. Ex. format, order, or size.
+            axNode->setInvalid(Inspector::Protocol::Page::AXNode::Invalid::True);
+    }
+    switch (axObject->orientation()) {
+        case AccessibilityOrientation::Undefined:
+            break;
+        case AccessibilityOrientation::Vertical:
+            axNode->setOrientation("vertical"_s);
+            break;
+        case AccessibilityOrientation::Horizontal:
+            axNode->setOrientation("horizontal"_s);
+            break;
+    }
+
+    if (axObject->isKeyboardFocusable())
+        axNode->setFocusable(axObject->isKeyboardFocusable());
+
+    if (nodeToFind && axObject->node() == nodeToFind)
+        axNode->setFound(true);
+
+    if (axObject->hasChildren()) {
+        Ref<JSON::ArrayOf<Inspector::Protocol::Page::AXNode>> children = JSON::ArrayOf<Inspector::Protocol::Page::AXNode>::create();
+        for (auto& childObject : axObject->children())
+            children->addItem(snapshotForAXObject(childObject, nodeToFind));
+        axNode->setChildren(WTFMove(children));
+    }
+    return axNode;
+}
+
+
+Protocol::ErrorStringOr<Ref<Protocol::Page::AXNode>> InspectorPageAgent::accessibilitySnapshot(const String& objectId)
+{
+    if (!WebCore::AXObjectCache::accessibilityEnabled())
+        WebCore::AXObjectCache::enableAccessibility();
+    auto document = makeRefPtr(m_inspectedPage.mainFrame().document());
+    if (!document)
+        return makeUnexpected("No document for main frame"_s);
+
+    AXObjectCache* axObjectCache = document->axObjectCache();
+    if (!axObjectCache)
+        return makeUnexpected("No AXObjectCache for main document"_s);
+
+    AXCoreObject* axObject = axObjectCache->rootObject();
+    if (!axObject)
+        return makeUnexpected("No AXObject for main document"_s);
+
+    Node* node = nullptr;
+    if (!objectId.isEmpty()) {
+        InspectorDOMAgent* domAgent = m_instrumentingAgents.persistentDOMAgent();
+        ASSERT(domAgent);
+        node = domAgent->nodeForObjectId(objectId);
+        if (!node)
+            return makeUnexpected("No Node for objectId"_s);
+    }
+
+    m_doingAccessibilitySnapshot = true;
+    Ref<Inspector::Protocol::Page::AXNode> axNode = snapshotForAXObject(makeRefPtr(axObject), node);
+    m_doingAccessibilitySnapshot = false;
+    return axNode;
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::setInterceptFileChooserDialog(bool enabled)
+{
+    m_interceptFileChooserDialog = enabled;
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::setDefaultBackgroundColorOverride(RefPtr<JSON::Object>&& color)
+{
+    FrameView* view = m_inspectedPage.mainFrame().view();
+    if (!view)
+        return makeUnexpected("Internal error: No frame view to set color two"_s);
+
+    if (!color) {
+        view->updateBackgroundRecursively(Optional<Color>());
+        return { };
+    }
+
+    view->updateBackgroundRecursively(InspectorDOMAgent::parseColor(WTFMove(color)));
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::createUserWorld(const String& name)
+{
+    if (createdUserWorlds().contains(name))
+        return makeUnexpected("World with the given name already exists"_s);
+
+    Ref<DOMWrapperWorld> world = ScriptController::createWorld(name, ScriptController::WorldType::User);
+    ensureUserWorldsExistInAllFrames({world.ptr()});
+    createdUserWorlds().set(name, WTFMove(world));
+    return { };
+}
+
+void InspectorPageAgent::ensureUserWorldsExistInAllFrames(const Vector<DOMWrapperWorld*>& worlds)
+{
+    for (Frame* frame = &m_inspectedPage.mainFrame(); frame; frame = frame->tree().traverseNext()) {
+        for (auto* world : worlds)
+            frame->windowProxy().jsWindowProxy(*world)->window();
+    }
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::setBypassCSP(bool enabled)
+{
+    m_bypassCSP = enabled;
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::crash()
+{
+    CRASH();
+    return { };
+}
+
+Protocol::ErrorStringOr<void> InspectorPageAgent::setOrientationOverride(Optional<int>&& angle)
+{
+#if ENABLE(ORIENTATION_EVENTS)
+    m_inspectedPage.setOverrideOrientation(WTFMove(angle));
+    return { };
+#else
+    UNUSED_PARAM(angle);
+    return makeUnexpected("Orientation events are disabled in this build");
 #endif
+}
 
 } // namespace WebCore
diff --git a/Source/WebCore/inspector/agents/InspectorPageAgent.h b/Source/WebCore/inspector/agents/InspectorPageAgent.h
index 78a98224ab5450e0729751571fe1bb957d303301..a4f46cc377bde6a787f3e67ca4869bfc25461127 100644
--- a/Source/WebCore/inspector/agents/InspectorPageAgent.h
+++ b/Source/WebCore/inspector/agents/InspectorPageAgent.h
@@ -34,17 +34,23 @@
 #include "CachedResource.h"
 #include "InspectorWebAgentBase.h"
 #include "LayoutRect.h"
+#include "ProcessIdentifier.h"
 #include <JavaScriptCore/InspectorBackendDispatchers.h>
 #include <JavaScriptCore/InspectorFrontendDispatchers.h>
 #include <wtf/HashMap.h>
 #include <wtf/Seconds.h>
 #include <wtf/text/WTFString.h>
 
+namespace Inspector {
+class InjectedScriptManager;
+}
+
 namespace WebCore {
 
 class DOMWrapperWorld;
 class DocumentLoader;
 class Frame;
+class HTMLInputElement;
 class InspectorClient;
 class InspectorOverlay;
 class Page;
@@ -69,12 +75,14 @@ public:
         PingResource,
         BeaconResource,
         WebSocketResource,
+        EventSource,
 #if ENABLE(APPLICATION_MANIFEST)
         ApplicationManifestResource,
 #endif
         OtherResource,
     };
 
+    WEBCORE_EXPORT static String makeFrameID(ProcessIdentifier processID,  FrameIdentifier frameID);
     static bool sharedBufferContent(RefPtr<SharedBuffer>&&, const String& textEncodingName, bool withBase64Encode, String* result);
     static Vector<CachedResource*> cachedResourcesForFrame(Frame*);
     static void resourceContent(Inspector::Protocol::ErrorString&, Frame*, const URL&, String* result, bool* base64Encoded);
@@ -95,6 +103,8 @@ public:
     Inspector::Protocol::ErrorStringOr<void> enable();
     Inspector::Protocol::ErrorStringOr<void> disable();
     Inspector::Protocol::ErrorStringOr<void> reload(Optional<bool>&& ignoreCache, Optional<bool>&& revalidateAllResources);
+    Inspector::Protocol::ErrorStringOr<void> goBack();
+    Inspector::Protocol::ErrorStringOr<void> goForward();
     Inspector::Protocol::ErrorStringOr<void> navigate(const String& url);
     Inspector::Protocol::ErrorStringOr<void> overrideUserAgent(const String&);
     Inspector::Protocol::ErrorStringOr<void> overrideSetting(Inspector::Protocol::Page::Setting, Optional<bool>&& value);
@@ -114,25 +124,35 @@ public:
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
     Inspector::Protocol::ErrorStringOr<void> setForcedAppearance(Optional<Inspector::Protocol::Page::Appearance>&&);
 #endif
+    Inspector::Protocol::ErrorStringOr<void> setTimeZone(const String&);
+    Inspector::Protocol::ErrorStringOr<void> setTouchEmulationEnabled(bool);
     Inspector::Protocol::ErrorStringOr<String> snapshotNode(Inspector::Protocol::DOM::NodeId);
     Inspector::Protocol::ErrorStringOr<String> snapshotRect(int x, int y, int width, int height, Inspector::Protocol::Page::CoordinateSystem);
 #if ENABLE(WEB_ARCHIVE) && USE(CF)
     Inspector::Protocol::ErrorStringOr<String> archive();
 #endif
-#if !PLATFORM(COCOA)
     Inspector::Protocol::ErrorStringOr<void> setScreenSizeOverride(Optional<int>&& width, Optional<int>&& height);
-#endif
+
+    Inspector::Protocol::ErrorStringOr<void> insertText(const String& text);
+    Inspector::Protocol::ErrorStringOr<Ref<Inspector::Protocol::Page::AXNode>> accessibilitySnapshot(const String& objectId);
+    Inspector::Protocol::ErrorStringOr<void> setInterceptFileChooserDialog(bool enabled);
+    Inspector::Protocol::ErrorStringOr<void> setDefaultBackgroundColorOverride(RefPtr<JSON::Object>&&);
+    Inspector::Protocol::ErrorStringOr<void> createUserWorld(const String&);
+    Inspector::Protocol::ErrorStringOr<void> setBypassCSP(bool);
+    Inspector::Protocol::ErrorStringOr<void> crash();
+    Inspector::Protocol::ErrorStringOr<void> setScreenSizeOverride(int width, int height);
+    Inspector::Protocol::ErrorStringOr<void> setOrientationOverride(Optional<int>&& angle);
 
     // InspectorInstrumentation
-    void domContentEventFired();
-    void loadEventFired();
+    void domContentEventFired(Frame&);
+    void loadEventFired(Frame&);
     void frameNavigated(Frame&);
     void frameDetached(Frame&);
-    void loaderDetachedFromFrame(DocumentLoader&);
     void frameStartedLoading(Frame&);
     void frameStoppedLoading(Frame&);
     void frameScheduledNavigation(Frame&, Seconds delay);
     void frameClearedScheduledNavigation(Frame&);
+    void didNavigateWithinPage(Frame&);
 #if ENABLE(DARK_MODE_CSS) || HAVE(OS_DARK_MODE_SUPPORT)
     void defaultAppearanceDidChange(bool useDarkAppearance);
 #endif
@@ -143,6 +163,12 @@ public:
     void didLayout();
     void didScroll();
     void didRecalculateStyle();
+    void runOpenPanel(HTMLInputElement* element, bool* intercept);
+    void frameAttached(Frame&);
+    bool shouldBypassCSP();
+    void willCheckNewWindowPolicy(const URL&);
+    void didCheckNewWindowPolicy(bool allowed);
+    bool doingAccessibilitySnapshot() const { return m_doingAccessibilitySnapshot; };
 
     Frame* frameForId(const Inspector::Protocol::Network::FrameId&);
     WEBCORE_EXPORT String frameId(Frame*);
@@ -151,6 +177,7 @@ public:
 
 private:
     double timestamp();
+    void ensureUserWorldsExistInAllFrames(const Vector<DOMWrapperWorld*>&);
 
     static bool mainResourceContent(Frame*, bool withBase64Encode, String* result);
     static bool dataContent(const char* data, unsigned size, const String& textEncodingName, bool withBase64Encode, String* result);
@@ -162,18 +189,19 @@ private:
     RefPtr<Inspector::PageBackendDispatcher> m_backendDispatcher;
 
     Page& m_inspectedPage;
+    Inspector::InjectedScriptManager& m_injectedScriptManager;
     InspectorClient* m_client { nullptr };
     InspectorOverlay* m_overlay { nullptr };
 
-    // FIXME: Make a WeakHashMap and use it for m_frameToIdentifier and m_loaderToIdentifier.
-    HashMap<Frame*, String> m_frameToIdentifier;
     HashMap<String, WeakPtr<Frame>> m_identifierToFrame;
-    HashMap<DocumentLoader*, String> m_loaderToIdentifier;
     String m_userAgentOverride;
     String m_emulatedMedia;
     String m_bootstrapScript;
     bool m_isFirstLayoutAfterOnLoad { false };
     bool m_showPaintRects { false };
+    bool m_interceptFileChooserDialog { false };
+    bool m_bypassCSP { false };
+    bool m_doingAccessibilitySnapshot { false };
 };
 
 } // namespace WebCore
diff --git a/Source/WebCore/inspector/agents/InspectorWorkerAgent.cpp b/Source/WebCore/inspector/agents/InspectorWorkerAgent.cpp
index 33caa0aa2079ad4081cc29605a53537c24d66bef..4b74d397d4de9a7eba3d5530538443d8907726aa 100644
--- a/Source/WebCore/inspector/agents/InspectorWorkerAgent.cpp
+++ b/Source/WebCore/inspector/agents/InspectorWorkerAgent.cpp
@@ -161,7 +161,11 @@ void InspectorWorkerAgent::connectToWorkerInspectorProxy(WorkerInspectorProxy& p
 
     m_connectedProxies.set(proxy.identifier(), &proxy);
 
-    m_frontendDispatcher->workerCreated(proxy.identifier(), proxy.url().string(), proxy.name());
+    ASSERT(is<Document>(proxy.scriptExecutionContext()));
+    Document& document = downcast<Document>(*proxy.scriptExecutionContext());
+    auto* pageAgent = m_instrumentingAgents.enabledPageAgent();
+    m_frontendDispatcher->workerCreated(proxy.identifier(), proxy.url().string(), proxy.name(),
+        pageAgent ? pageAgent->frameId(document.frame()) : emptyString());
 }
 
 void InspectorWorkerAgent::disconnectFromWorkerInspectorProxy(WorkerInspectorProxy& proxy)
diff --git a/Source/WebCore/inspector/agents/page/PageDebuggerAgent.cpp b/Source/WebCore/inspector/agents/page/PageDebuggerAgent.cpp
index 69f97fb2b9a959f1ae4a9ae59928b8350df3f875..a8e72eba9aaa24435ccdc8c0b3df44026cb7d6a2 100644
--- a/Source/WebCore/inspector/agents/page/PageDebuggerAgent.cpp
+++ b/Source/WebCore/inspector/agents/page/PageDebuggerAgent.cpp
@@ -38,6 +38,7 @@
 #include "Frame.h"
 #include "InspectorPageAgent.h"
 #include "InstrumentingAgents.h"
+#include "JSDOMWindowBase.h"
 #include "Page.h"
 #include "PageConsoleClient.h"
 #include "PageDebugger.h"
@@ -70,7 +71,11 @@ bool PageDebuggerAgent::enabled() const
 
 Protocol::ErrorStringOr<std::tuple<Ref<Protocol::Runtime::RemoteObject>, Optional<bool> /* wasThrown */, Optional<int> /* savedResultIndex */>> PageDebuggerAgent::evaluateOnCallFrame(const Protocol::Debugger::CallFrameId& callFrameId, const String& expression, const String& objectGroup, Optional<bool>&& includeCommandLineAPI, Optional<bool>&& doNotPauseOnExceptionsAndMuteConsole, Optional<bool>&& returnByValue, Optional<bool>&& generatePreview, Optional<bool>&& saveResult, Optional<bool>&& emulateUserGesture)
 {
-    UserGestureEmulationScope userGestureScope(m_inspectedPage, emulateUserGesture && *emulateUserGesture);
+    InjectedScript injectedScript = injectedScriptManager().injectedScriptForObjectId(callFrameId);
+    JSC::JSGlobalObject* globalObject = injectedScript.globalObject();
+    Document* document = globalObject ? activeDOMWindow(*globalObject).document() : nullptr;
+    auto shouldEmulateUserGesture = emulateUserGesture && *emulateUserGesture;
+    UserGestureEmulationScope userGestureScope(m_inspectedPage, shouldEmulateUserGesture, document);
 
     return WebDebuggerAgent::evaluateOnCallFrame(callFrameId, expression, objectGroup, WTFMove(includeCommandLineAPI), WTFMove(doNotPauseOnExceptionsAndMuteConsole), WTFMove(returnByValue), WTFMove(generatePreview), WTFMove(saveResult), WTFMove(emulateUserGesture));
 }
diff --git a/Source/WebCore/inspector/agents/page/PageRuntimeAgent.cpp b/Source/WebCore/inspector/agents/page/PageRuntimeAgent.cpp
index 00e69f1aa2e3f8ea2f445e8dd446dd16ea6363df..92d45059ca6d87ddf7b6cc12033267a4c108a73c 100644
--- a/Source/WebCore/inspector/agents/page/PageRuntimeAgent.cpp
+++ b/Source/WebCore/inspector/agents/page/PageRuntimeAgent.cpp
@@ -35,12 +35,14 @@
 #include "DOMWrapperWorld.h"
 #include "Document.h"
 #include "Frame.h"
+#include "FrameLoader.h"
 #include "InspectorPageAgent.h"
 #include "InstrumentingAgents.h"
 #include "JSDOMWindowBase.h"
 #include "Page.h"
 #include "PageConsoleClient.h"
 #include "ScriptController.h"
+#include "ScriptSourceCode.h"
 #include "ScriptState.h"
 #include "SecurityOrigin.h"
 #include "UserGestureEmulationScope.h"
@@ -103,6 +105,15 @@ void PageRuntimeAgent::didClearWindowObjectInWorld(Frame& frame, DOMWrapperWorld
     notifyContextCreated(pageAgent->frameId(&frame), frame.script().globalObject(world), world);
 }
 
+void PageRuntimeAgent::didReceiveMainResourceError(Frame& frame)
+{
+    if (frame.loader().stateMachine().isDisplayingInitialEmptyDocument()) {
+        // Ensure execution context is created for the empty docment to make
+        // it usable in case loading failed.
+        mainWorldExecState(&frame);
+    }
+}
+
 InjectedScript PageRuntimeAgent::injectedScriptForEval(Protocol::ErrorString& errorString, Optional<Protocol::Runtime::ExecutionContextId>&& executionContextId)
 {
     if (!executionContextId) {
@@ -191,13 +202,23 @@ void PageRuntimeAgent::notifyContextCreated(const Protocol::Network::FrameId& fr
 
 Protocol::ErrorStringOr<std::tuple<Ref<Protocol::Runtime::RemoteObject>, Optional<bool> /* wasThrown */, Optional<int> /* savedResultIndex */>> PageRuntimeAgent::evaluate(const String& expression, const String& objectGroup, Optional<bool>&& includeCommandLineAPI, Optional<bool>&& doNotPauseOnExceptionsAndMuteConsole, Optional<Protocol::Runtime::ExecutionContextId>&& executionContextId, Optional<bool>&& returnByValue, Optional<bool>&& generatePreview, Optional<bool>&& saveResult, Optional<bool>&& emulateUserGesture)
 {
-    UserGestureEmulationScope userGestureScope(m_inspectedPage, emulateUserGesture && *emulateUserGesture);
+    String errorString;
+    InjectedScript injectedScript = injectedScriptForEval(errorString, Optional(executionContextId));
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    JSC::JSGlobalObject* globalObject = injectedScript.globalObject();
+    Document* document = globalObject ? activeDOMWindow(*globalObject).document() : nullptr;
+    UserGestureEmulationScope userGestureScope(m_inspectedPage, emulateUserGesture && *emulateUserGesture, document);
     return InspectorRuntimeAgent::evaluate(expression, objectGroup, WTFMove(includeCommandLineAPI), WTFMove(doNotPauseOnExceptionsAndMuteConsole), WTFMove(executionContextId), WTFMove(returnByValue), WTFMove(generatePreview), WTFMove(saveResult), WTFMove(emulateUserGesture));
 }
 
 Protocol::ErrorStringOr<std::tuple<Ref<Protocol::Runtime::RemoteObject>, Optional<bool> /* wasThrown */>> PageRuntimeAgent::callFunctionOn(const Protocol::Runtime::RemoteObjectId& objectId, const String& expression, RefPtr<JSON::Array>&& optionalArguments, Optional<bool>&& doNotPauseOnExceptionsAndMuteConsole, Optional<bool>&& returnByValue, Optional<bool>&& generatePreview, Optional<bool>&& emulateUserGesture)
 {
-    UserGestureEmulationScope userGestureScope(m_inspectedPage, emulateUserGesture && *emulateUserGesture);
+    InjectedScript injectedScript = injectedScriptManager().injectedScriptForObjectId(objectId);
+    JSC::JSGlobalObject* globalObject = injectedScript.globalObject();
+    Document* document = globalObject ? activeDOMWindow(*globalObject).document() : nullptr;
+    UserGestureEmulationScope userGestureScope(m_inspectedPage, emulateUserGesture && *emulateUserGesture, document);
     return InspectorRuntimeAgent::callFunctionOn(objectId, expression, WTFMove(optionalArguments), WTFMove(doNotPauseOnExceptionsAndMuteConsole), WTFMove(returnByValue), WTFMove(generatePreview), WTFMove(emulateUserGesture));
 }
 
diff --git a/Source/WebCore/inspector/agents/page/PageRuntimeAgent.h b/Source/WebCore/inspector/agents/page/PageRuntimeAgent.h
index 298465c52b42464c2733659e07f3f760174a95eb..3b7ac5a5e6fba11bfbc3d641e5a312db5f1391a8 100644
--- a/Source/WebCore/inspector/agents/page/PageRuntimeAgent.h
+++ b/Source/WebCore/inspector/agents/page/PageRuntimeAgent.h
@@ -62,6 +62,7 @@ public:
     // InspectorInstrumentation
     void frameNavigated(Frame&);
     void didClearWindowObjectInWorld(Frame&, DOMWrapperWorld&);
+    void didReceiveMainResourceError(Frame&);
 
 private:
     Inspector::InjectedScript injectedScriptForEval(Inspector::Protocol::ErrorString&, Optional<Inspector::Protocol::Runtime::ExecutionContextId>&&);
@@ -72,7 +73,6 @@ private:
 
     std::unique_ptr<Inspector::RuntimeFrontendDispatcher> m_frontendDispatcher;
     RefPtr<Inspector::RuntimeBackendDispatcher> m_backendDispatcher;
-
     InstrumentingAgents& m_instrumentingAgents;
 
     Page& m_inspectedPage;
diff --git a/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.cpp b/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.cpp
index 633bce6e8f3c0785632eb7f26d172f6016b3efd9..14f531504bb2b96646d1a48092a0b132b0510f55 100644
--- a/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.cpp
+++ b/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.cpp
@@ -39,9 +39,9 @@
 
 namespace WebCore {
 
-UserGestureEmulationScope::UserGestureEmulationScope(Page& inspectedPage, bool emulateUserGesture)
+UserGestureEmulationScope::UserGestureEmulationScope(Page& inspectedPage, bool emulateUserGesture, Document* document)
     : m_pageChromeClient(inspectedPage.chrome().client())
-    , m_gestureIndicator(emulateUserGesture ? Optional<ProcessingUserGestureState>(ProcessingUserGesture) : WTF::nullopt)
+    , m_gestureIndicator(emulateUserGesture ? Optional<ProcessingUserGestureState>(ProcessingUserGesture) : WTF::nullopt, document)
     , m_emulateUserGesture(emulateUserGesture)
     , m_userWasInteracting(false)
 {
diff --git a/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.h b/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.h
index b94ed78ad3dbea19543c1fd54653f0481e52fb7c..6341c7ff7ef53577f33c19ecad1b8bfbd674d051 100644
--- a/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.h
+++ b/Source/WebCore/inspector/agents/page/UserGestureEmulationScope.h
@@ -38,11 +38,12 @@ namespace WebCore {
 
 class ChromeClient;
 class Page;
+class Document;
 
 class UserGestureEmulationScope {
     WTF_MAKE_NONCOPYABLE(UserGestureEmulationScope);
 public:
-    UserGestureEmulationScope(Page& inspectedPage, bool emulateUserGesture);
+    UserGestureEmulationScope(Page& inspectedPage, bool emulateUserGesture, Document* document);
     ~UserGestureEmulationScope();
 
 private:
diff --git a/Source/WebCore/loader/DocumentLoader.cpp b/Source/WebCore/loader/DocumentLoader.cpp
index fec52547c038e1904280a5c7215815824774fbe9..33563fb495ebdbf94a3175b87ddd9979ed727e95 100644
--- a/Source/WebCore/loader/DocumentLoader.cpp
+++ b/Source/WebCore/loader/DocumentLoader.cpp
@@ -1326,8 +1326,6 @@ void DocumentLoader::detachFromFrame()
     if (!m_frame)
         return;
 
-    InspectorInstrumentation::loaderDetachedFromFrame(*m_frame, *this);
-
     observeFrame(nullptr);
 }
 
diff --git a/Source/WebCore/loader/DocumentLoader.h b/Source/WebCore/loader/DocumentLoader.h
index c21678201701d3fa8d41c9ef45ee824eddff64bf..f1f23cf11fd4d646d57118df361ab77a1b5530d2 100644
--- a/Source/WebCore/loader/DocumentLoader.h
+++ b/Source/WebCore/loader/DocumentLoader.h
@@ -166,9 +166,13 @@ public:
 
     WEBCORE_EXPORT virtual void detachFromFrame();
 
+    virtual void replacedByFragmentNavigation(Frame&) { }
+
     WEBCORE_EXPORT FrameLoader* frameLoader() const;
     WEBCORE_EXPORT SubresourceLoader* mainResourceLoader() const;
     WEBCORE_EXPORT RefPtr<SharedBuffer> mainResourceData() const;
+
+    virtual uint64_t loaderIDForInspector() { return 0; }
     
     DocumentWriter& writer() const { return m_writer; }
 
diff --git a/Source/WebCore/loader/FrameLoader.cpp b/Source/WebCore/loader/FrameLoader.cpp
index 79c5448b8c906d2fb6d31fae941ebbd408d57d50..232905525e847997d96bda0b8856b56a60bdc701 100644
--- a/Source/WebCore/loader/FrameLoader.cpp
+++ b/Source/WebCore/loader/FrameLoader.cpp
@@ -1176,6 +1176,7 @@ void FrameLoader::loadInSameDocument(const URL& url, SerializedScriptValue* stat
     }
 
     m_client->dispatchDidNavigateWithinPage();
+    InspectorInstrumentation::didNavigateWithinPage(m_frame);
 
     m_frame.document()->statePopped(stateObject ? Ref<SerializedScriptValue> { *stateObject } : SerializedScriptValue::nullValue());
     m_client->dispatchDidPopStateWithinPage();
@@ -1487,6 +1488,7 @@ void FrameLoader::load(FrameLoadRequest&& request)
 
 void FrameLoader::loadWithNavigationAction(const ResourceRequest& request, NavigationAction&& action, FrameLoadType type, RefPtr<FormState>&& formState, AllowNavigationToInvalidURL allowNavigationToInvalidURL, CompletionHandler<void()>&& completionHandler)
 {
+    InspectorInstrumentation::frameScheduledNavigation(m_frame, Seconds(0));
     FRAMELOADER_RELEASE_LOG_IF_ALLOWED(ResourceLoading, "loadWithNavigationAction: frame load started");
 
     Ref<DocumentLoader> loader = m_client->createDocumentLoader(request, defaultSubstituteDataForURL(request.url()));
@@ -1590,6 +1592,8 @@ void FrameLoader::loadWithDocumentLoader(DocumentLoader* loader, FrameLoadType t
     const String& httpMethod = loader->request().httpMethod();
 
     if (shouldPerformFragmentNavigation(isFormSubmission, httpMethod, policyChecker().loadType(), newURL)) {
+        loader->replacedByFragmentNavigation(m_frame);
+
         RefPtr<DocumentLoader> oldDocumentLoader = m_documentLoader;
         NavigationAction action { *m_frame.document(), loader->request(), InitiatedByMainFrame::Unknown, policyChecker().loadType(), isFormSubmission };
 
@@ -3160,6 +3164,8 @@ void FrameLoader::receivedMainResourceError(const ResourceError& error)
     checkCompleted();
     if (m_frame.page())
         checkLoadComplete();
+
+    InspectorInstrumentation::didReceiveMainResourceError(m_frame, error);
 }
 
 void FrameLoader::continueFragmentScrollAfterNavigationPolicy(const ResourceRequest& request, bool shouldContinue)
@@ -3922,9 +3928,6 @@ String FrameLoader::referrer() const
 
 void FrameLoader::dispatchDidClearWindowObjectsInAllWorlds()
 {
-    if (!m_frame.script().canExecuteScripts(NotAboutToExecuteScript))
-        return;
-
     Vector<Ref<DOMWrapperWorld>> worlds;
     ScriptController::getAllWorlds(worlds);
     for (auto& world : worlds)
@@ -3933,13 +3936,13 @@ void FrameLoader::dispatchDidClearWindowObjectsInAllWorlds()
 
 void FrameLoader::dispatchDidClearWindowObjectInWorld(DOMWrapperWorld& world)
 {
-    if (!m_frame.script().canExecuteScripts(NotAboutToExecuteScript) || !m_frame.windowProxy().existingJSWindowProxy(world))
-        return;
-
-    m_client->dispatchDidClearWindowObjectInWorld(world);
+    if (m_frame.windowProxy().existingJSWindowProxy(world)) {
+        if (m_frame.script().canExecuteScripts(NotAboutToExecuteScript))
+            m_client->dispatchDidClearWindowObjectInWorld(world);
 
-    if (Page* page = m_frame.page())
-        page->inspectorController().didClearWindowObjectInWorld(m_frame, world);
+        if (Page* page = m_frame.page())
+            page->inspectorController().didClearWindowObjectInWorld(m_frame, world);
+    }
 
     InspectorInstrumentation::didClearWindowObjectInWorld(m_frame, world);
 }
diff --git a/Source/WebCore/loader/LoaderStrategy.h b/Source/WebCore/loader/LoaderStrategy.h
index 6097d2650766a2c87a60426272ae6aba0358b297..9f6e41db65a1745a0d9bb343a762e1960a4b5586 100644
--- a/Source/WebCore/loader/LoaderStrategy.h
+++ b/Source/WebCore/loader/LoaderStrategy.h
@@ -80,6 +80,7 @@ public:
 
     virtual bool isOnLine() const = 0;
     virtual void addOnlineStateChangeListener(WTF::Function<void(bool)>&&) = 0;
+    virtual void setEmulateOfflineState(bool) {};
 
     virtual bool shouldPerformSecurityChecks() const { return false; }
     virtual bool havePerformedSecurityChecks(const ResourceResponse&) const { return false; }
diff --git a/Source/WebCore/loader/PolicyChecker.cpp b/Source/WebCore/loader/PolicyChecker.cpp
index 276148a63f36cc46ae0cf2bb535c33f2aa07e30b..998e983870098b620cf154819379aa0b039f7e66 100644
--- a/Source/WebCore/loader/PolicyChecker.cpp
+++ b/Source/WebCore/loader/PolicyChecker.cpp
@@ -46,6 +46,7 @@
 #include "HTMLFormElement.h"
 #include "HTMLFrameOwnerElement.h"
 #include "HTMLPlugInElement.h"
+#include "InspectorInstrumentation.h"
 #include "Logging.h"
 #include <wtf/CompletionHandler.h>
 
@@ -259,26 +260,32 @@ void FrameLoader::PolicyChecker::checkNewWindowPolicy(NavigationAction&& navigat
 
     auto blobURLLifetimeExtension = extendBlobURLLifetimeIfNecessary(request, nullptr);
 
+    InspectorInstrumentation::willCheckNewWindowPolicy(m_frame, request.url());
     auto requestIdentifier = PolicyCheckIdentifier::create();
     m_frame.loader().client().dispatchDecidePolicyForNewWindowAction(navigationAction, request, formState.get(), frameName, requestIdentifier, [frame = makeRef(m_frame), request,
         formState = WTFMove(formState), frameName, navigationAction, function = WTFMove(function), blobURLLifetimeExtension = WTFMove(blobURLLifetimeExtension),
         requestIdentifier] (PolicyAction policyAction, PolicyCheckIdentifier responseIdentifier) mutable {
 
-        if (!responseIdentifier.isValidFor(requestIdentifier))
+        if (!responseIdentifier.isValidFor(requestIdentifier)) {
+            InspectorInstrumentation::didCheckNewWindowPolicy(frame.get(), false);
             return function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
+        }
 
         switch (policyAction) {
         case PolicyAction::Download:
             frame->loader().client().startDownload(request);
             FALLTHROUGH;
         case PolicyAction::Ignore:
+            InspectorInstrumentation::didCheckNewWindowPolicy(frame.get(), false);
             function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
             return;
         case PolicyAction::StopAllLoads:
             ASSERT_NOT_REACHED();
+            InspectorInstrumentation::didCheckNewWindowPolicy(frame.get(), false);
             function({ }, nullptr, { }, { }, ShouldContinuePolicyCheck::No);
             return;
         case PolicyAction::Use:
+            InspectorInstrumentation::didCheckNewWindowPolicy(frame.get(), true);
             function(request, makeWeakPtr(formState.get()), frameName, navigationAction, ShouldContinuePolicyCheck::Yes);
             return;
         }
diff --git a/Source/WebCore/loader/ProgressTracker.cpp b/Source/WebCore/loader/ProgressTracker.cpp
index e24fded2225f1c1918f454017566717e20484eab..30e4b7a986418c4b4f6c799b858b608206e22bb5 100644
--- a/Source/WebCore/loader/ProgressTracker.cpp
+++ b/Source/WebCore/loader/ProgressTracker.cpp
@@ -154,6 +154,8 @@ void ProgressTracker::progressCompleted(Frame& frame)
     if (!m_numProgressTrackedFrames || m_originatingProgressFrame == &frame)
         finalProgressComplete();
 
+    InspectorInstrumentation::frameStoppedLoading(frame);
+
     m_client->didChangeEstimatedProgress();
 }
 
@@ -179,8 +181,6 @@ void ProgressTracker::finalProgressComplete()
     frame->loader().client().setMainFrameDocumentReady(true);
     m_client->progressFinished(*frame);
     frame->loader().loadProgressingStatusChanged();
-
-    InspectorInstrumentation::frameStoppedLoading(*frame);
 }
 
 void ProgressTracker::incrementProgress(unsigned long identifier, const ResourceResponse& response)
diff --git a/Source/WebCore/page/ChromeClient.h b/Source/WebCore/page/ChromeClient.h
index 3a9e1d669097e595d9b57fc4cff7e61a5d18d0a9..dd8b2fb90e585f3f7ed782c11ea5739195363e21 100644
--- a/Source/WebCore/page/ChromeClient.h
+++ b/Source/WebCore/page/ChromeClient.h
@@ -286,7 +286,7 @@ public:
 #endif
 
 #if ENABLE(ORIENTATION_EVENTS)
-    virtual int deviceOrientation() const = 0;
+    virtual int deviceOrientation() const { return 0; }
 #endif
 
 #if ENABLE(INPUT_TYPE_COLOR)
diff --git a/Source/WebCore/page/EventHandler.cpp b/Source/WebCore/page/EventHandler.cpp
index 5be980462613e21d3b12e6e0e533d6104899d2f1..9d5a09f8c5278108a1195311e1a44f0b72062190 100644
--- a/Source/WebCore/page/EventHandler.cpp
+++ b/Source/WebCore/page/EventHandler.cpp
@@ -121,6 +121,7 @@
 
 #if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
 #include "PlatformTouchEvent.h"
+#include "PointerCaptureController.h"
 #endif
 
 #if ENABLE(MAC_GESTURE_EVENTS)
@@ -828,9 +829,7 @@ bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& eve
     m_mousePressNode = event.targetNode();
     m_frame.document()->setFocusNavigationStartingNode(event.targetNode());
 
-#if ENABLE(DRAG_SUPPORT)
     m_dragStartPosition = event.event().position();
-#endif
 
     m_mousePressed = true;
     m_selectionInitiationState = HaveNotStartedSelection;
@@ -869,8 +868,6 @@ VisiblePosition EventHandler::selectionExtentRespectingEditingBoundary(const Vis
     return targetNode->renderer()->positionForPoint(LayoutPoint(selectionEndPoint), nullptr);
 }
 
-#if ENABLE(DRAG_SUPPORT)
-
 #if !PLATFORM(IOS_FAMILY)
 
 bool EventHandler::supportsSelectionUpdatesOnMouseDrag() const
@@ -892,8 +889,10 @@ bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& e
 
     Ref<Frame> protectedFrame(m_frame);
 
+#if ENABLE(DRAG_SUPPORT)
     if (handleDrag(event, checkDragHysteresis))
         return true;
+#endif
 
     Node* targetNode = event.targetNode();
     if (event.event().button() != LeftButton || !targetNode)
@@ -914,7 +913,9 @@ bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& e
     ASSERT(m_mouseDownMayStartSelect || m_mouseDownMayStartAutoscroll);
 #endif
 
+#if ENABLE(DRAG_SUPPORT)
     m_mouseDownMayStartDrag = false;
+#endif
 
     if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
         m_autoscrollController->startAutoscrollForSelection(renderer);
@@ -931,6 +932,8 @@ bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& e
     return true;
 }
     
+#if ENABLE(DRAG_SUPPORT)
+
 bool EventHandler::eventMayStartDrag(const PlatformMouseEvent& event) const
 {
     // This is a pre-flight check of whether the event might lead to a drag being started.  Be careful
@@ -962,6 +965,8 @@ bool EventHandler::eventMayStartDrag(const PlatformMouseEvent& event) const
     return targetElement && page->dragController().draggableElement(&m_frame, targetElement, result.roundedPointInInnerNodeFrame(), state);
 }
 
+#endif // ENABLE(DRAG_SUPPORT)
+
 void EventHandler::updateSelectionForMouseDrag()
 {
     if (!supportsSelectionUpdatesOnMouseDrag())
@@ -1053,7 +1058,6 @@ void EventHandler::updateSelectionForMouseDrag(const HitTestResult& hitTestResul
     m_frame.selection().setSelectionByMouseIfDifferent(newSelection, m_frame.selection().granularity(),
         FrameSelection::EndPointsAdjustmentMode::AdjustAtBidiBoundary);
 }
-#endif // ENABLE(DRAG_SUPPORT)
 
 void EventHandler::lostMouseCapture()
 {
@@ -1101,9 +1105,7 @@ bool EventHandler::handleMouseReleaseEvent(const MouseEventWithHitTestResults& e
     // on the selection, the selection goes away.  However, if we are
     // editing, place the caret.
     if (m_mouseDownWasSingleClickInSelection && m_selectionInitiationState != ExtendedSelection
-#if ENABLE(DRAG_SUPPORT)
             && m_dragStartPosition == event.event().position()
-#endif
             && m_frame.selection().isRange()
             && event.event().button() != RightButton) {
         VisibleSelection newSelection;
@@ -2064,10 +2066,8 @@ bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& platformMouseE
     
     swallowEvent = !dispatchMouseEvent(eventNames().mousemoveEvent, mouseEvent.targetNode(), 0, platformMouseEvent, FireMouseOverOut::Yes);
 
-#if ENABLE(DRAG_SUPPORT)
     if (!swallowEvent)
         swallowEvent = handleMouseDraggedEvent(mouseEvent);
-#endif
 
     return swallowEvent;
 }
@@ -4234,7 +4234,8 @@ bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
             allTouchReleased = false;
     }
 
-    for (auto& point : points) {
+    for (unsigned index = 0; index < points.size(); index++) {
+        auto& point = points[index];
         PlatformTouchPoint::State pointState = point.state();
         LayoutPoint pagePoint = documentPointForWindowPoint(m_frame, point.pos());
 
@@ -4360,6 +4361,9 @@ bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
             changedTouches[pointState].m_touches->append(WTFMove(touch));
             changedTouches[pointState].m_targets.add(touchTarget);
         }
+        document.page()->pointerCaptureController().dispatchEventForTouchAtIndex(
+            *touchTarget, event, index, index == 0, *document.windowProxy());
+
     }
     m_touchPressed = touches->length() > 0;
     if (allTouchReleased)
diff --git a/Source/WebCore/page/EventHandler.h b/Source/WebCore/page/EventHandler.h
index e8558865654f934385d280eb39ffa18334a8cd8a..e30d0dc063c3a77dcf739e09fa394a72062efd75 100644
--- a/Source/WebCore/page/EventHandler.h
+++ b/Source/WebCore/page/EventHandler.h
@@ -134,9 +134,7 @@ public:
 
     WEBCORE_EXPORT VisiblePosition selectionExtentRespectingEditingBoundary(const VisibleSelection&, const LayoutPoint&, Node*);
 
-#if ENABLE(DRAG_SUPPORT)
     void updateSelectionForMouseDrag();
-#endif
 
 #if ENABLE(PAN_SCROLLING)
     void didPanScrollStart();
@@ -366,10 +364,8 @@ private:
     bool handleMousePressEventDoubleClick(const MouseEventWithHitTestResults&);
     bool handleMousePressEventTripleClick(const MouseEventWithHitTestResults&);
 
-#if ENABLE(DRAG_SUPPORT)
     bool handleMouseDraggedEvent(const MouseEventWithHitTestResults&, CheckDragHysteresis = ShouldCheckDragHysteresis);
     bool shouldAllowMouseDownToStartDrag() const;
-#endif
 
     WEBCORE_EXPORT bool handleMouseReleaseEvent(const MouseEventWithHitTestResults&);
 
@@ -466,10 +462,8 @@ private:
     void defaultTabEventHandler(KeyboardEvent&);
     void defaultArrowEventHandler(FocusDirection, KeyboardEvent&);
 
-#if ENABLE(DRAG_SUPPORT)
     OptionSet<DragSourceAction> updateDragSourceActionsAllowed() const;
     bool supportsSelectionUpdatesOnMouseDrag() const;
-#endif
 
     // The following are called at the beginning of handleMouseUp and handleDrag.  
     // If they return true it indicates that they have consumed the event.
@@ -477,9 +471,10 @@ private:
 
 #if ENABLE(DRAG_SUPPORT)
     bool eventLoopHandleMouseDragged(const MouseEventWithHitTestResults&);
-    void updateSelectionForMouseDrag(const HitTestResult&);
 #endif
 
+    void updateSelectionForMouseDrag(const HitTestResult&);
+
     enum class SetOrClearLastScrollbar { Clear, Set };
     void updateLastScrollbarUnderMouse(Scrollbar*, SetOrClearLastScrollbar);
     
@@ -529,10 +524,7 @@ private:
     enum SelectionInitiationState { HaveNotStartedSelection, PlacedCaret, ExtendedSelection };
     SelectionInitiationState m_selectionInitiationState { HaveNotStartedSelection };
 
-#if ENABLE(DRAG_SUPPORT)
     LayoutPoint m_dragStartPosition;
-#endif
-
     Timer m_hoverTimer;
     bool m_hasScheduledCursorUpdate { false };
 
diff --git a/Source/WebCore/page/EventSource.cpp b/Source/WebCore/page/EventSource.cpp
index 757765c3b4872d5a6f92b34e3f2ac67eaaf2dd82..69c4ef67941cee93213ccac1aa04d2cb1db08782 100644
--- a/Source/WebCore/page/EventSource.cpp
+++ b/Source/WebCore/page/EventSource.cpp
@@ -36,6 +36,7 @@
 #include "CachedResourceRequestInitiators.h"
 #include "ContentSecurityPolicy.h"
 #include "EventNames.h"
+#include "InspectorNetworkAgent.h"
 #include "MessageEvent.h"
 #include "ResourceError.h"
 #include "ResourceRequest.h"
@@ -97,6 +98,7 @@ void EventSource::connect()
     ASSERT(!m_requestInFlight);
 
     ResourceRequest request { m_url };
+    request.setInitiatorIdentifier(InspectorNetworkAgent::initiatorIdentifierForEventSource());
     request.setHTTPMethod("GET");
     request.setHTTPHeaderField(HTTPHeaderName::Accept, "text/event-stream");
     request.setHTTPHeaderField(HTTPHeaderName::CacheControl, "no-cache");
diff --git a/Source/WebCore/page/Frame.cpp b/Source/WebCore/page/Frame.cpp
index 62a4054b2dcf48cc68450ebe04cdc4366e3f3fce..32ffa68cf8f5e852c3dfb387932163b1f5bc18e2 100644
--- a/Source/WebCore/page/Frame.cpp
+++ b/Source/WebCore/page/Frame.cpp
@@ -39,6 +39,7 @@
 #include "CachedResourceLoader.h"
 #include "Chrome.h"
 #include "ChromeClient.h"
+#include "ComposedTreeIterator.h"
 #include "DOMWindow.h"
 #include "DocumentTimeline.h"
 #include "DocumentType.h"
@@ -71,6 +72,7 @@
 #include "NavigationScheduler.h"
 #include "Navigator.h"
 #include "NodeList.h"
+#include "NodeRenderStyle.h"
 #include "NodeTraversal.h"
 #include "Page.h"
 #include "ProcessWarming.h"
@@ -179,6 +181,7 @@ Frame::Frame(Page& page, HTMLFrameOwnerElement* ownerElement, UniqueRef<FrameLoa
 void Frame::init()
 {
     m_loader->init();
+    InspectorInstrumentation::frameAttached(this);
 }
 
 Ref<Frame> Frame::create(Page* page, HTMLFrameOwnerElement* ownerElement, UniqueRef<FrameLoaderClient>&& client)
@@ -358,7 +361,7 @@ void Frame::orientationChanged()
 int Frame::orientation() const
 {
     if (m_page)
-        return m_page->chrome().client().deviceOrientation();
+        return m_page->orientation();
     return 0;
 }
 #endif // ENABLE(ORIENTATION_EVENTS)
@@ -1143,6 +1146,358 @@ TextStream& operator<<(TextStream& ts, const Frame& frame)
     return ts;
 }
 
+void Frame::betterApproximateNode(const IntPoint& testPoint, const NodeQualifier& nodeQualifierFunction, Node*& best, Node* failedNode, IntPoint& bestPoint, IntRect& bestRect, const IntRect& testRect)
+{
+    IntRect candidateRect;
+    constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::ReadOnly, HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent, HitTestRequest::AllowVisibleChildFrameContentOnly };
+    auto* candidate = nodeQualifierFunction(eventHandler().hitTestResultAtPoint(testPoint, hitType), failedNode, &candidateRect);
+
+    // Bail if we have no candidate, or the candidate is already equal to our current best node,
+    // or our candidate is the avoidedNode and there is a current best node.
+    if (!candidate || candidate == best)
+        return;
+
+    // The document should never be considered the best alternative.
+    if (candidate->isDocumentNode())
+        return;
+
+    if (best) {
+        IntRect bestIntersect = intersection(testRect, bestRect);
+        IntRect candidateIntersect = intersection(testRect, candidateRect);
+        // if the candidate intersection is smaller than the current best intersection, bail.
+        if (candidateIntersect.width() * candidateIntersect.height() <= bestIntersect.width() * bestIntersect.height())
+            return;
+    }
+
+    // At this point we either don't have a previous best, or our current candidate has a better intersection.
+    best = candidate;
+    bestPoint = testPoint;
+    bestRect = candidateRect;
+}
+
+bool Frame::hitTestResultAtViewportLocation(const FloatPoint& viewportLocation, HitTestResult& hitTestResult, IntPoint& center)
+{
+    if (!m_doc || !m_doc->renderView())
+        return false;
+
+    FrameView* view = m_view.get();
+    if (!view)
+        return false;
+
+    center = view->windowToContents(roundedIntPoint(viewportLocation));
+    constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::ReadOnly, HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent, HitTestRequest::AllowVisibleChildFrameContentOnly };
+    hitTestResult = eventHandler().hitTestResultAtPoint(center, hitType);
+    return true;
+}
+ 
+Node* Frame::qualifyingNodeAtViewportLocation(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation, const NodeQualifier& nodeQualifierFunction, ShouldApproximate shouldApproximate, ShouldFindRootEditableElement shouldFindRootEditableElement)
+{
+    adjustedViewportLocation = viewportLocation;
+
+    IntPoint testCenter;
+    HitTestResult candidateInfo;
+    if (!hitTestResultAtViewportLocation(viewportLocation, candidateInfo, testCenter))
+        return nullptr;
+
+    IntPoint bestPoint = testCenter;
+
+    // We have the candidate node at the location, check whether it or one of its ancestors passes
+    // the qualifier function, which typically checks if the node responds to a particular event type.
+    Node* approximateNode = nodeQualifierFunction(candidateInfo, 0, 0);
+
+    if (shouldFindRootEditableElement == ShouldFindRootEditableElement::Yes && approximateNode && approximateNode->isContentEditable()) {
+        // If we are in editable content, we look for the root editable element.
+        approximateNode = approximateNode->rootEditableElement();
+        // If we have a focusable node, there is no need to approximate.
+        if (approximateNode)
+            shouldApproximate = ShouldApproximate::No;
+    }
+
+    float scale = page() ? page()->pageScaleFactor() : 1;
+#if PLATFORM(IOS_FAMILY)
+    float ppiFactor = screenPPIFactor();
+#else
+    float ppiFactor = 326; // most popular iPhone PPI
+#endif
+
+    static const float unscaledSearchRadius = 15;
+    int searchRadius = static_cast<int>(unscaledSearchRadius * ppiFactor / scale);
+
+    if (approximateNode && shouldApproximate == ShouldApproximate::Yes) {
+        const float testOffsets[] = {
+            -.3f, -.3f,
+            -.6f, -.6f,
+            +.3f, +.3f,
+            -.9f, -.9f,
+        };
+
+        Node* originalApproximateNode = approximateNode;
+        for (unsigned n = 0; n < WTF_ARRAY_LENGTH(testOffsets); n += 2) {
+            IntSize testOffset(testOffsets[n] * searchRadius, testOffsets[n + 1] * searchRadius);
+            IntPoint testPoint = testCenter + testOffset;
+
+            constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::ReadOnly, HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent, HitTestRequest::AllowChildFrameContent };
+            auto candidateInfo = eventHandler().hitTestResultAtPoint(testPoint, hitType);
+            Node* candidateNode = nodeQualifierFunction(candidateInfo, 0, 0);
+            if (candidateNode && candidateNode->isDescendantOf(originalApproximateNode)) {
+                approximateNode = candidateNode;
+                bestPoint = testPoint;
+                break;
+            }
+        }
+    } else if (!approximateNode && shouldApproximate == ShouldApproximate::Yes) {
+        // Grab the closest parent element of our failed candidate node.
+        Node* candidate = candidateInfo.innerNode();
+        Node* failedNode = candidate;
+
+        while (candidate && !candidate->isElementNode())
+            candidate = candidate->parentInComposedTree();
+
+        if (candidate)
+            failedNode = candidate;
+
+        // The center point was tested earlier.
+        const float testOffsets[] = {
+            -.3f, -.3f,
+            +.3f, -.3f,
+            -.3f, +.3f,
+            +.3f, +.3f,
+            -.6f, -.6f,
+            +.6f, -.6f,
+            -.6f, +.6f,
+            +.6f, +.6f,
+            -1.f, 0,
+            +1.f, 0,
+            0, +1.f,
+            0, -1.f,
+        };
+        IntRect bestFrame;
+        IntRect testRect(testCenter, IntSize());
+        testRect.inflate(searchRadius);
+        int currentTestRadius = 0;
+        for (unsigned n = 0; n < WTF_ARRAY_LENGTH(testOffsets); n += 2) {
+            IntSize testOffset(testOffsets[n] * searchRadius, testOffsets[n + 1] * searchRadius);
+            IntPoint testPoint = testCenter + testOffset;
+            int testRadius = std::max(abs(testOffset.width()), abs(testOffset.height()));
+            if (testRadius > currentTestRadius) {
+                // Bail out with the best match within a radius
+                currentTestRadius = testRadius;
+                if (approximateNode)
+                    break;
+            }
+            betterApproximateNode(testPoint, nodeQualifierFunction, approximateNode, failedNode, bestPoint, bestFrame, testRect);
+        }
+    }
+
+    if (approximateNode) {
+        IntPoint p = m_view->contentsToWindow(bestPoint);
+        adjustedViewportLocation = p;
+        if (shouldFindRootEditableElement == ShouldFindRootEditableElement::Yes && approximateNode->isContentEditable()) {
+            // When in editable content, look for the root editable node again,
+            // since this could be the node found with the approximation.
+            approximateNode = approximateNode->rootEditableElement();
+        }
+    }
+
+    return approximateNode;
+}
+
+Node* Frame::deepestNodeAtLocation(const FloatPoint& viewportLocation)
+{
+    IntPoint center;
+    HitTestResult hitTestResult;
+    if (!hitTestResultAtViewportLocation(viewportLocation, hitTestResult, center))
+        return nullptr;
+
+    return hitTestResult.innerNode();
+}
+
+static bool nodeIsMouseFocusable(Node& node)
+{
+    if (!is<Element>(node))
+        return false;
+
+    auto& element = downcast<Element>(node);
+    if (element.isMouseFocusable())
+        return true;
+
+    if (auto shadowRoot = makeRefPtr(element.shadowRoot())) {
+        if (shadowRoot->delegatesFocus()) {
+            for (auto& node : composedTreeDescendants(element)) {
+                if (is<Element>(node) && downcast<Element>(node).isMouseFocusable())
+                    return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+static bool nodeWillRespondToMouseEvents(Node& node)
+{
+    return node.willRespondToMouseClickEvents() || node.willRespondToMouseMoveEvents() || nodeIsMouseFocusable(node);
+}
+
+Node* Frame::approximateNodeAtViewportLocationLegacy(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation)
+{
+    // This function is only used for UIWebView.
+    auto&& ancestorRespondingToClickEvents = [](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
+        bool bodyHasBeenReached = false;
+        bool pointerCursorStillValid = true;
+
+        if (nodeBounds)
+            *nodeBounds = IntRect();
+
+        auto node = hitTestResult.innerNode();
+        if (!node)
+            return nullptr;
+
+        Node* pointerCursorNode = nullptr;
+        for (; node && node != terminationNode; node = node->parentInComposedTree()) {
+            // We only accept pointer nodes before reaching the body tag.
+            if (node->hasTagName(HTMLNames::bodyTag)) {
+                // Make sure we cover the case of an empty editable body.
+                if (!pointerCursorNode && node->isContentEditable())
+                    pointerCursorNode = node;
+                bodyHasBeenReached = true;
+                pointerCursorStillValid = false;
+            }
+
+            // If we already have a pointer, and we reach a table, don't accept it.
+            if (pointerCursorNode && (node->hasTagName(HTMLNames::tableTag) || node->hasTagName(HTMLNames::tbodyTag)))
+                pointerCursorStillValid = false;
+
+            // If we haven't reached the body, and we are still paying attention to pointer cursors, and the node has a pointer cursor.
+            if (pointerCursorStillValid && node->renderStyle() && node->renderStyle()->cursor() == CursorType::Pointer)
+                pointerCursorNode = node;
+            else if (pointerCursorNode) {
+                // We want the lowest unbroken chain of pointer cursors.
+                pointerCursorStillValid = false;
+            }
+
+            if (nodeWillRespondToMouseEvents(*node)) {
+                // If we're at the body or higher, use the pointer cursor node (which may be null).
+                if (bodyHasBeenReached)
+                    node = pointerCursorNode;
+
+                // If we are interested about the frame, use it.
+                if (nodeBounds) {
+                    // This is a check to see whether this node is an area element. The only way this can happen is if this is the first check.
+                    if (node == hitTestResult.innerNode() && node != hitTestResult.innerNonSharedNode() && is<HTMLAreaElement>(*node))
+                        *nodeBounds = snappedIntRect(downcast<HTMLAreaElement>(*node).computeRect(hitTestResult.innerNonSharedNode()->renderer()));
+                    else if (node && node->renderer())
+                        *nodeBounds = node->renderer()->absoluteBoundingBoxRect(true);
+                }
+
+                return node;
+            }
+        }
+
+        return nullptr;
+    };
+
+    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, WTFMove(ancestorRespondingToClickEvents), ShouldApproximate::Yes);
+}
+
+static inline NodeQualifier ancestorRespondingToClickEventsNodeQualifier(SecurityOrigin* securityOrigin = nullptr)
+{
+    return [securityOrigin](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
+        if (nodeBounds)
+            *nodeBounds = IntRect();
+
+        auto node = hitTestResult.innerNode();
+        if (!node || (securityOrigin && !securityOrigin->isSameOriginAs(node->document().securityOrigin())))
+            return nullptr;
+
+        for (; node && node != terminationNode; node = node->parentInComposedTree()) {
+            if (nodeWillRespondToMouseEvents(*node)) {
+                // If we are interested about the frame, use it.
+                if (nodeBounds) {
+                    // This is a check to see whether this node is an area element. The only way this can happen is if this is the first check.
+                    if (node == hitTestResult.innerNode() && node != hitTestResult.innerNonSharedNode() && is<HTMLAreaElement>(*node))
+                        *nodeBounds = snappedIntRect(downcast<HTMLAreaElement>(*node).computeRect(hitTestResult.innerNonSharedNode()->renderer()));
+                    else if (node && node->renderer())
+                        *nodeBounds = node->renderer()->absoluteBoundingBoxRect(true);
+                }
+
+                return node;
+            }
+        }
+
+        return nullptr;
+    };
+}
+
+Node* Frame::nodeRespondingToClickEvents(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation, SecurityOrigin* securityOrigin)
+{
+    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, ancestorRespondingToClickEventsNodeQualifier(securityOrigin), ShouldApproximate::Yes);
+}
+
+Node* Frame::nodeRespondingToDoubleClickEvent(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation)
+{
+    auto&& ancestorRespondingToDoubleClickEvent = [](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
+        if (nodeBounds)
+            *nodeBounds = IntRect();
+
+        auto* node = hitTestResult.innerNode();
+        if (!node)
+            return nullptr;
+
+        for (; node && node != terminationNode; node = node->parentInComposedTree()) {
+            if (!node->hasEventListeners(eventNames().dblclickEvent))
+                continue;
+#if ENABLE(TOUCH_EVENTS)
+            if (!node->allowsDoubleTapGesture())
+                continue;
+#endif
+            if (nodeBounds && node->renderer())
+                *nodeBounds = node->renderer()->absoluteBoundingBoxRect(true);
+            return node;
+        }
+        return nullptr;
+    };
+
+    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, WTFMove(ancestorRespondingToDoubleClickEvent), ShouldApproximate::Yes);
+}
+
+Node* Frame::nodeRespondingToInteraction(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation)
+{
+    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, ancestorRespondingToClickEventsNodeQualifier(), ShouldApproximate::Yes, ShouldFindRootEditableElement::No);
+}
+
+Node* Frame::nodeRespondingToScrollWheelEvents(const FloatPoint& viewportLocation)
+{
+    auto&& ancestorRespondingToScrollWheelEvents = [](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
+        if (nodeBounds)
+            *nodeBounds = IntRect();
+
+        Node* scrollingAncestor = nullptr;
+        for (Node* node = hitTestResult.innerNode(); node && node != terminationNode && !node->hasTagName(HTMLNames::bodyTag); node = node->parentNode()) {
+            RenderObject* renderer = node->renderer();
+            if (!renderer)
+                continue;
+
+            if ((renderer->isTextField() || renderer->isTextArea()) && downcast<RenderTextControl>(*renderer).canScroll()) {
+                scrollingAncestor = node;
+                continue;
+            }
+
+            auto& style = renderer->style();
+
+            if (renderer->hasOverflowClip()
+                && (style.overflowY() == Overflow::Auto || style.overflowY() == Overflow::Scroll
+                || style.overflowX() == Overflow::Auto || style.overflowX() == Overflow::Scroll)) {
+                scrollingAncestor = node;
+            }
+        }
+
+        return scrollingAncestor;
+    };
+
+    FloatPoint adjustedViewportLocation;
+    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, WTFMove(ancestorRespondingToScrollWheelEvents), ShouldApproximate::No);
+}
+
 } // namespace WebCore
 
 #undef RELEASE_LOG_ERROR_IF_ALLOWED
diff --git a/Source/WebCore/page/Frame.h b/Source/WebCore/page/Frame.h
index c8f1c5753bfcf94bba700bb6a22af5780d1cf913..32e464dfcebd75135bce5b16ebbc15ecf449f21f 100644
--- a/Source/WebCore/page/Frame.h
+++ b/Source/WebCore/page/Frame.h
@@ -109,8 +109,8 @@ enum {
 };
 
 enum OverflowScrollAction { DoNotPerformOverflowScroll, PerformOverflowScroll };
-using NodeQualifier = Function<Node* (const HitTestResult&, Node* terminationNode, IntRect* nodeBounds)>;
 #endif
+using NodeQualifier = Function<Node* (const HitTestResult&, Node* terminationNode, IntRect* nodeBounds)>;
 
 enum {
     LayerTreeFlagsIncludeDebugInfo              = 1 << 0,
@@ -229,10 +229,6 @@ public:
     NSArray *dataDetectionResults() const { return m_dataDetectionResults.get(); }
 #endif
 
-#if PLATFORM(IOS_FAMILY)
-    const ViewportArguments& viewportArguments() const;
-    WEBCORE_EXPORT void setViewportArguments(const ViewportArguments&);
-
     WEBCORE_EXPORT Node* deepestNodeAtLocation(const FloatPoint& viewportLocation);
     WEBCORE_EXPORT Node* nodeRespondingToClickEvents(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation, SecurityOrigin* = nullptr);
     WEBCORE_EXPORT Node* nodeRespondingToDoubleClickEvent(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation);
@@ -240,6 +236,10 @@ public:
     WEBCORE_EXPORT Node* nodeRespondingToScrollWheelEvents(const FloatPoint& viewportLocation);
     WEBCORE_EXPORT Node* approximateNodeAtViewportLocationLegacy(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation);
 
+#if PLATFORM(IOS_FAMILY)
+    const ViewportArguments& viewportArguments() const;
+    WEBCORE_EXPORT void setViewportArguments(const ViewportArguments&);
+
     WEBCORE_EXPORT NSArray *wordsInCurrentParagraph() const;
     WEBCORE_EXPORT CGRect renderRectForPoint(CGPoint, bool* isReplaced, float* fontSize) const;
 
@@ -349,7 +349,6 @@ private:
 #if ENABLE(DATA_DETECTION)
     RetainPtr<NSArray> m_dataDetectionResults;
 #endif
-#if PLATFORM(IOS_FAMILY)
     void betterApproximateNode(const IntPoint& testPoint, const NodeQualifier&, Node*& best, Node* failedNode, IntPoint& bestPoint, IntRect& bestRect, const IntRect& testRect);
     bool hitTestResultAtViewportLocation(const FloatPoint& viewportLocation, HitTestResult&, IntPoint& center);
     
@@ -357,6 +356,7 @@ private:
     enum class ShouldFindRootEditableElement : bool { No, Yes };
     Node* qualifyingNodeAtViewportLocation(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation, const NodeQualifier&, ShouldApproximate, ShouldFindRootEditableElement = ShouldFindRootEditableElement::Yes);
 
+#if PLATFORM(IOS_FAMILY)
     void setTimersPausedInternal(bool);
 
     ViewportArguments m_viewportArguments;
diff --git a/Source/WebCore/page/FrameSnapshotting.cpp b/Source/WebCore/page/FrameSnapshotting.cpp
index e2f8a37fb89b421eebfa846e54c47ee795c6a9ab..f31da2c7cb84a027601c68d26232670c1f3ab142 100644
--- a/Source/WebCore/page/FrameSnapshotting.cpp
+++ b/Source/WebCore/page/FrameSnapshotting.cpp
@@ -114,7 +114,12 @@ RefPtr<ImageBuffer> snapshotFrameRectWithClip(Frame& frame, const IntRect& image
     auto buffer = ImageBuffer::create(imageRect.size(), RenderingMode::Unaccelerated, scaleFactor);
     if (!buffer)
         return nullptr;
+#if !PLATFORM(MAC)
+    buffer->context().scale(scaleFactor);
+#endif
     buffer->context().translate(-imageRect.x(), -imageRect.y());
+    if (coordinateSpace != FrameView::ViewCoordinates)
+      buffer->context().scale(1 / frame.page()->pageScaleFactor());
 
     if (!clipRects.isEmpty()) {
         Path clipPath;
@@ -123,7 +128,10 @@ RefPtr<ImageBuffer> snapshotFrameRectWithClip(Frame& frame, const IntRect& image
         buffer->context().clipPath(clipPath);
     }
 
-    frame.view()->paintContentsForSnapshot(buffer->context(), imageRect, shouldIncludeSelection, coordinateSpace);
+    FloatRect fr = imageRect;
+    if (coordinateSpace != FrameView::ViewCoordinates)
+      fr.scale(frame.page()->pageScaleFactor());
+    frame.view()->paintContentsForSnapshot(buffer->context(), enclosingIntRect(fr), shouldIncludeSelection, coordinateSpace);
     return buffer;
 }
 
diff --git a/Source/WebCore/page/FrameView.cpp b/Source/WebCore/page/FrameView.cpp
index 47d03107f04a2948dfe9782b330059a88d1c532a..8aca9ff57db21027877278980fab857ddc7fa612 100644
--- a/Source/WebCore/page/FrameView.cpp
+++ b/Source/WebCore/page/FrameView.cpp
@@ -3037,7 +3037,7 @@ void FrameView::setBaseBackgroundColor(const Color& backgroundColor)
 
 void FrameView::updateBackgroundRecursively(const Optional<Color>& backgroundColor)
 {
-#if HAVE(OS_DARK_MODE_SUPPORT)
+#if HAVE(OS_DARK_MODE_SUPPORT) && (defined(WTF_PLATFORM_MAC) && WTF_PLATFORM_MAC) || (defined(WTF_PLATFORM_IOS_FAMILY) && WTF_PLATFORM_IOS_FAMILY)
     Color baseBackgroundColor = backgroundColor.valueOr(RenderTheme::singleton().systemColor(CSSValueAppleSystemControlBackground, styleColorOptions()));
 #else
     Color baseBackgroundColor = backgroundColor.valueOr(Color::white);
diff --git a/Source/WebCore/page/History.cpp b/Source/WebCore/page/History.cpp
index 38fd7b29b53eab484e30963b51c8ae525c5d7a38..3c2f2104e3f364d3d6201e3009a448b4db317d03 100644
--- a/Source/WebCore/page/History.cpp
+++ b/Source/WebCore/page/History.cpp
@@ -33,6 +33,7 @@
 #include "FrameLoaderClient.h"
 #include "HistoryController.h"
 #include "HistoryItem.h"
+#include "InspectorInstrumentation.h"
 #include "Logging.h"
 #include "NavigationScheduler.h"
 #include "Page.h"
@@ -260,6 +261,7 @@ ExceptionOr<void> History::stateObjectAdded(RefPtr<SerializedScriptValue>&& data
 
     if (!urlString.isEmpty())
         frame->document()->updateURLForPushOrReplaceState(fullURL);
+    InspectorInstrumentation::didNavigateWithinPage(*frame);
 
     if (stateObjectType == StateObjectType::Push) {
         frame->loader().history().pushState(WTFMove(data), title, fullURL.string());
diff --git a/Source/WebCore/page/Page.cpp b/Source/WebCore/page/Page.cpp
index f942b4b4e7022591f12519f89ab72e7484c1e559..d4cc9a72a19f65a0e00b47f0bd29cc2f63542115 100644
--- a/Source/WebCore/page/Page.cpp
+++ b/Source/WebCore/page/Page.cpp
@@ -435,6 +435,37 @@ void Page::setOverrideViewportArguments(const Optional<ViewportArguments>& viewp
         document->updateViewportArguments();
 }
 
+FloatSize Page::screenSize()
+{
+    return m_overrideScreenSize.valueOr(screenRect(mainFrame().view()).size());
+}
+
+void Page::setOverrideScreenSize(Optional<FloatSize> size)
+{
+    if (size == m_overrideScreenSize)
+        return;
+
+    m_overrideScreenSize = size;
+    if (auto* document = mainFrame().document())
+        document->updateViewportArguments();
+}
+
+#if ENABLE(ORIENTATION_EVENTS)
+int Page::orientation() const
+{
+    return m_overrideOrientation.valueOr(chrome().client().deviceOrientation());
+}
+
+void Page::setOverrideOrientation(Optional<int> orientation)
+{
+    if (orientation == m_overrideOrientation)
+        return;
+
+    m_overrideOrientation = orientation;
+    mainFrame().orientationChanged();
+}
+#endif
+
 ScrollingCoordinator* Page::scrollingCoordinator()
 {
     if (!m_scrollingCoordinator && m_settings->scrollingCoordinatorEnabled()) {
diff --git a/Source/WebCore/page/Page.h b/Source/WebCore/page/Page.h
index 1036afa8cb98d678cc607446c8956b39ba6d23ef..56d36dd99dd40832a1864bfc4a2b1cb6e02c3520 100644
--- a/Source/WebCore/page/Page.h
+++ b/Source/WebCore/page/Page.h
@@ -249,6 +249,9 @@ public:
     const Optional<ViewportArguments>& overrideViewportArguments() const { return m_overrideViewportArguments; }
     WEBCORE_EXPORT void setOverrideViewportArguments(const Optional<ViewportArguments>&);
 
+    WEBCORE_EXPORT FloatSize screenSize();
+    void setOverrideScreenSize(Optional<FloatSize> size);
+
     static void refreshPlugins(bool reload);
     WEBCORE_EXPORT PluginData& pluginData();
     void clearPluginData();
@@ -810,6 +813,11 @@ public:
 
     WEBCORE_EXPORT Vector<Ref<Element>> editableElementsInRect(const FloatRect&) const;
 
+#if ENABLE(ORIENTATION_EVENTS)
+    int orientation() const;
+    void setOverrideOrientation(Optional<int>);
+#endif
+
 #if ENABLE(DEVICE_ORIENTATION) && PLATFORM(IOS_FAMILY)
     DeviceOrientationUpdateProvider* deviceOrientationUpdateProvider() const { return m_deviceOrientationUpdateProvider.get(); }
 #endif
@@ -1119,6 +1127,11 @@ private:
 #endif
 
     Optional<ViewportArguments> m_overrideViewportArguments;
+    Optional<FloatSize> m_overrideScreenSize;
+
+#if ENABLE(ORIENTATION_EVENTS)
+    Optional<int> m_overrideOrientation;
+#endif
 
 #if ENABLE(DEVICE_ORIENTATION) && PLATFORM(IOS_FAMILY)
     RefPtr<DeviceOrientationUpdateProvider> m_deviceOrientationUpdateProvider;
diff --git a/Source/WebCore/page/PointerCaptureController.cpp b/Source/WebCore/page/PointerCaptureController.cpp
index d37f5889e219d828e09ae72343d8ebd3fecfb08f..7b0f956fc187f4747b93f6b8d8b7697c889d5361 100644
--- a/Source/WebCore/page/PointerCaptureController.cpp
+++ b/Source/WebCore/page/PointerCaptureController.cpp
@@ -181,7 +181,7 @@ bool PointerCaptureController::preventsCompatibilityMouseEventsForIdentifier(Poi
     return iterator != m_activePointerIdsToCapturingData.end() && iterator->value.preventsCompatibilityMouseEvents;
 }
 
-#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
+#if ENABLE(TOUCH_EVENTS)
 static bool hierarchyHasCapturingEventListeners(Element* target, const AtomString& eventName)
 {
     for (ContainerNode* curr = target; curr; curr = curr->parentInComposedTree()) {
@@ -463,7 +463,7 @@ void PointerCaptureController::cancelPointer(PointerID pointerId, const IntPoint
     capturingData.pendingTargetOverride = nullptr;
     capturingData.cancelled = true;
 
-#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
+#if ENABLE(TOUCH_EVENTS)
     capturingData.previousTarget = nullptr;
 #endif
 
diff --git a/Source/WebCore/page/PointerCaptureController.h b/Source/WebCore/page/PointerCaptureController.h
index 33bdbd20f4aaca7db33e055bdbea79c69800b3db..e8d329292d4b1fe6e49d74cb07a66339e63accdb 100644
--- a/Source/WebCore/page/PointerCaptureController.h
+++ b/Source/WebCore/page/PointerCaptureController.h
@@ -57,7 +57,7 @@ public:
 
     RefPtr<PointerEvent> pointerEventForMouseEvent(const MouseEvent&);
 
-#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
+#if ENABLE(TOUCH_EVENTS)
     void dispatchEventForTouchAtIndex(EventTarget&, const PlatformTouchEvent&, unsigned, bool isPrimary, WindowProxy&);
 #endif
 
@@ -72,7 +72,7 @@ private:
     struct CapturingData {
         RefPtr<Element> pendingTargetOverride;
         RefPtr<Element> targetOverride;
-#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
+#if ENABLE(TOUCH_EVENTS)
         RefPtr<Element> previousTarget;
 #endif
         String pointerType;
diff --git a/Source/WebCore/page/RuntimeEnabledFeatures.cpp b/Source/WebCore/page/RuntimeEnabledFeatures.cpp
index e9d30c7c06618177cbab04e35b75735dc291ad1f..d0673b66d9c14e4e3f2317faa29438aa0bdc616e 100644
--- a/Source/WebCore/page/RuntimeEnabledFeatures.cpp
+++ b/Source/WebCore/page/RuntimeEnabledFeatures.cpp
@@ -56,7 +56,11 @@ RuntimeEnabledFeatures& RuntimeEnabledFeatures::sharedFeatures()
 #if ENABLE(TOUCH_EVENTS)
 bool RuntimeEnabledFeatures::touchEventsEnabled() const
 {
-    return m_touchEventsEnabled.valueOr(screenHasTouchDevice());
+    return m_touchEventsEnabled.valueOr(platformScreenHasTouchDevice());
+}
+bool RuntimeEnabledFeatures::isTouchPrimaryInputDevice() const
+{
+    return m_touchEventsEnabled.valueOr(platformScreenIsTouchPrimaryInputDevice());
 }
 #endif
 
diff --git a/Source/WebCore/page/RuntimeEnabledFeatures.h b/Source/WebCore/page/RuntimeEnabledFeatures.h
index f804f073e09f6ff5a4e5f4b649832f3aaa47e586..17300db7d85a9c545ecf4d15bb0ad4499410769f 100644
--- a/Source/WebCore/page/RuntimeEnabledFeatures.h
+++ b/Source/WebCore/page/RuntimeEnabledFeatures.h
@@ -211,6 +211,7 @@ public:
     void setMouseEventsSimulationEnabled(bool isEnabled) { m_mouseEventsSimulationEnabled = isEnabled; }
     bool touchEventsEnabled() const;
     void setTouchEventsEnabled(bool isEnabled) { m_touchEventsEnabled = isEnabled; }
+    bool isTouchPrimaryInputDevice() const;
 #endif
 
     bool pageAtRuleSupportEnabled() const { return m_pageAtRuleSupportEnabled; }
diff --git a/Source/WebCore/page/SocketProvider.cpp b/Source/WebCore/page/SocketProvider.cpp
index 3bec0aef174336939838fb1069fffbcb9f3d5604..566ef3806be3c5ccf1bb951251c2a90dba7071a3 100644
--- a/Source/WebCore/page/SocketProvider.cpp
+++ b/Source/WebCore/page/SocketProvider.cpp
@@ -33,7 +33,7 @@ namespace WebCore {
     
 Ref<SocketStreamHandle> SocketProvider::createSocketStreamHandle(const URL& url, SocketStreamHandleClient& client, WebSocketIdentifier, PAL::SessionID sessionID, const String& credentialPartition, const StorageSessionProvider* provider)
 {
-    return SocketStreamHandleImpl::create(url, client, sessionID, credentialPartition, { }, provider);
+    return SocketStreamHandleImpl::create(url, false, client, sessionID, credentialPartition, { }, provider);
 }
 
 RefPtr<ThreadableWebSocketChannel> SocketProvider::createWebSocketChannel(Document&, WebSocketChannelClient&)
diff --git a/Source/WebCore/page/csp/ContentSecurityPolicy.cpp b/Source/WebCore/page/csp/ContentSecurityPolicy.cpp
index 37d5c443785f3df52bddb775cb9c1e66e0dd97b6..f2329ad61fd4f4ad006ca89ba2bdc729278dee0d 100644
--- a/Source/WebCore/page/csp/ContentSecurityPolicy.cpp
+++ b/Source/WebCore/page/csp/ContentSecurityPolicy.cpp
@@ -299,6 +299,8 @@ bool ContentSecurityPolicy::protocolMatchesSelf(const URL& url) const
 template<typename Predicate, typename... Args>
 typename std::enable_if<!std::is_convertible<Predicate, ContentSecurityPolicy::ViolatedDirectiveCallback>::value, bool>::type ContentSecurityPolicy::allPoliciesWithDispositionAllow(Disposition disposition, Predicate&& predicate, Args&&... args) const
 {
+    if (InspectorInstrumentation::shouldBypassCSP(m_scriptExecutionContext))
+        return true;
     bool isReportOnly = disposition == ContentSecurityPolicy::Disposition::ReportOnly;
     for (auto& policy : m_policies) {
         if (policy->isReportOnly() != isReportOnly)
@@ -312,6 +314,8 @@ typename std::enable_if<!std::is_convertible<Predicate, ContentSecurityPolicy::V
 template<typename Predicate, typename... Args>
 bool ContentSecurityPolicy::allPoliciesWithDispositionAllow(Disposition disposition, ViolatedDirectiveCallback&& callback, Predicate&& predicate, Args&&... args) const
 {
+    if (InspectorInstrumentation::shouldBypassCSP(m_scriptExecutionContext))
+        return true;
     bool isReportOnly = disposition == ContentSecurityPolicy::Disposition::ReportOnly;
     bool isAllowed = true;
     for (auto& policy : m_policies) {
@@ -328,6 +332,8 @@ bool ContentSecurityPolicy::allPoliciesWithDispositionAllow(Disposition disposit
 template<typename Predicate, typename... Args>
 bool ContentSecurityPolicy::allPoliciesAllow(ViolatedDirectiveCallback&& callback, Predicate&& predicate, Args&&... args) const
 {
+    if (InspectorInstrumentation::shouldBypassCSP(m_scriptExecutionContext))
+        return true;
     bool isAllowed = true;
     for (auto& policy : m_policies) {
         if (const ContentSecurityPolicyDirective* violatedDirective = (policy.get()->*predicate)(std::forward<Args>(args)...)) {
diff --git a/Source/WebCore/page/ios/FrameIOS.mm b/Source/WebCore/page/ios/FrameIOS.mm
index 32d32e59b24265286710a5f3f7053e1816ad9e3b..34f7e01b612710a817debb7f8d25d6bd5f0e9e6d 100644
--- a/Source/WebCore/page/ios/FrameIOS.mm
+++ b/Source/WebCore/page/ios/FrameIOS.mm
@@ -225,354 +225,6 @@ CGRect Frame::renderRectForPoint(CGPoint point, bool* isReplaced, float* fontSiz
     return CGRectZero;
 }
 
-void Frame::betterApproximateNode(const IntPoint& testPoint, const NodeQualifier& nodeQualifierFunction, Node*& best, Node* failedNode, IntPoint& bestPoint, IntRect& bestRect, const IntRect& testRect)
-{
-    IntRect candidateRect;
-    constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::ReadOnly, HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent, HitTestRequest::AllowVisibleChildFrameContentOnly };
-    auto* candidate = nodeQualifierFunction(eventHandler().hitTestResultAtPoint(testPoint, hitType), failedNode, &candidateRect);
-
-    // Bail if we have no candidate, or the candidate is already equal to our current best node,
-    // or our candidate is the avoidedNode and there is a current best node.
-    if (!candidate || candidate == best)
-        return;
-
-    // The document should never be considered the best alternative.
-    if (candidate->isDocumentNode())
-        return;
-
-    if (best) {
-        IntRect bestIntersect = intersection(testRect, bestRect);
-        IntRect candidateIntersect = intersection(testRect, candidateRect);
-        // if the candidate intersection is smaller than the current best intersection, bail.
-        if (candidateIntersect.width() * candidateIntersect.height() <= bestIntersect.width() * bestIntersect.height())
-            return;
-    }
-
-    // At this point we either don't have a previous best, or our current candidate has a better intersection.
-    best = candidate;
-    bestPoint = testPoint;
-    bestRect = candidateRect;
-}
-
-bool Frame::hitTestResultAtViewportLocation(const FloatPoint& viewportLocation, HitTestResult& hitTestResult, IntPoint& center)
-{
-    if (!m_doc || !m_doc->renderView())
-        return false;
-
-    FrameView* view = m_view.get();
-    if (!view)
-        return false;
-
-    center = view->windowToContents(roundedIntPoint(viewportLocation));
-    constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::ReadOnly, HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent, HitTestRequest::AllowVisibleChildFrameContentOnly };
-    hitTestResult = eventHandler().hitTestResultAtPoint(center, hitType);
-    return true;
-}
-
-Node* Frame::qualifyingNodeAtViewportLocation(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation, const NodeQualifier& nodeQualifierFunction, ShouldApproximate shouldApproximate, ShouldFindRootEditableElement shouldFindRootEditableElement)
-{
-    adjustedViewportLocation = viewportLocation;
-
-    IntPoint testCenter;
-    HitTestResult candidateInfo;
-    if (!hitTestResultAtViewportLocation(viewportLocation, candidateInfo, testCenter))
-        return nullptr;
-
-    IntPoint bestPoint = testCenter;
-
-    // We have the candidate node at the location, check whether it or one of its ancestors passes
-    // the qualifier function, which typically checks if the node responds to a particular event type.
-    Node* approximateNode = nodeQualifierFunction(candidateInfo, 0, 0);
-
-    if (shouldFindRootEditableElement == ShouldFindRootEditableElement::Yes && approximateNode && approximateNode->isContentEditable()) {
-        // If we are in editable content, we look for the root editable element.
-        approximateNode = approximateNode->rootEditableElement();
-        // If we have a focusable node, there is no need to approximate.
-        if (approximateNode)
-            shouldApproximate = ShouldApproximate::No;
-    }
-
-    float scale = page() ? page()->pageScaleFactor() : 1;
-    float ppiFactor = screenPPIFactor();
-
-    static const float unscaledSearchRadius = 15;
-    int searchRadius = static_cast<int>(unscaledSearchRadius * ppiFactor / scale);
-
-    if (approximateNode && shouldApproximate == ShouldApproximate::Yes) {
-        const float testOffsets[] = {
-            -.3f, -.3f,
-            -.6f, -.6f,
-            +.3f, +.3f,
-            -.9f, -.9f,
-        };
-
-        Node* originalApproximateNode = approximateNode;
-        for (unsigned n = 0; n < WTF_ARRAY_LENGTH(testOffsets); n += 2) {
-            IntSize testOffset(testOffsets[n] * searchRadius, testOffsets[n + 1] * searchRadius);
-            IntPoint testPoint = testCenter + testOffset;
-
-            constexpr OptionSet<HitTestRequest::RequestType> hitType { HitTestRequest::ReadOnly, HitTestRequest::Active, HitTestRequest::DisallowUserAgentShadowContent, HitTestRequest::AllowChildFrameContent };
-            auto candidateInfo = eventHandler().hitTestResultAtPoint(testPoint, hitType);
-            Node* candidateNode = nodeQualifierFunction(candidateInfo, 0, 0);
-            if (candidateNode && candidateNode->isDescendantOf(originalApproximateNode)) {
-                approximateNode = candidateNode;
-                bestPoint = testPoint;
-                break;
-            }
-        }
-    } else if (!approximateNode && shouldApproximate == ShouldApproximate::Yes) {
-        // Grab the closest parent element of our failed candidate node.
-        Node* candidate = candidateInfo.innerNode();
-        Node* failedNode = candidate;
-
-        while (candidate && !candidate->isElementNode())
-            candidate = candidate->parentInComposedTree();
-
-        if (candidate)
-            failedNode = candidate;
-
-        // The center point was tested earlier.
-        const float testOffsets[] = {
-            -.3f, -.3f,
-            +.3f, -.3f,
-            -.3f, +.3f,
-            +.3f, +.3f,
-            -.6f, -.6f,
-            +.6f, -.6f,
-            -.6f, +.6f,
-            +.6f, +.6f,
-            -1.f, 0,
-            +1.f, 0,
-            0, +1.f,
-            0, -1.f,
-        };
-        IntRect bestFrame;
-        IntRect testRect(testCenter, IntSize());
-        testRect.inflate(searchRadius);
-        int currentTestRadius = 0;
-        for (unsigned n = 0; n < WTF_ARRAY_LENGTH(testOffsets); n += 2) {
-            IntSize testOffset(testOffsets[n] * searchRadius, testOffsets[n + 1] * searchRadius);
-            IntPoint testPoint = testCenter + testOffset;
-            int testRadius = std::max(abs(testOffset.width()), abs(testOffset.height()));
-            if (testRadius > currentTestRadius) {
-                // Bail out with the best match within a radius
-                currentTestRadius = testRadius;
-                if (approximateNode)
-                    break;
-            }
-            betterApproximateNode(testPoint, nodeQualifierFunction, approximateNode, failedNode, bestPoint, bestFrame, testRect);
-        }
-    }
-
-    if (approximateNode) {
-        IntPoint p = m_view->contentsToWindow(bestPoint);
-        adjustedViewportLocation = p;
-        if (shouldFindRootEditableElement == ShouldFindRootEditableElement::Yes && approximateNode->isContentEditable()) {
-            // When in editable content, look for the root editable node again,
-            // since this could be the node found with the approximation.
-            approximateNode = approximateNode->rootEditableElement();
-        }
-    }
-
-    return approximateNode;
-}
-
-Node* Frame::deepestNodeAtLocation(const FloatPoint& viewportLocation)
-{
-    IntPoint center;
-    HitTestResult hitTestResult;
-    if (!hitTestResultAtViewportLocation(viewportLocation, hitTestResult, center))
-        return nullptr;
-
-    return hitTestResult.innerNode();
-}
-
-static bool nodeIsMouseFocusable(Node& node)
-{
-    if (!is<Element>(node))
-        return false;
-
-    auto& element = downcast<Element>(node);
-    if (element.isMouseFocusable())
-        return true;
-
-    if (auto shadowRoot = makeRefPtr(element.shadowRoot())) {
-        if (shadowRoot->delegatesFocus()) {
-            for (auto& node : composedTreeDescendants(element)) {
-                if (is<Element>(node) && downcast<Element>(node).isMouseFocusable())
-                    return true;
-            }
-        }
-    }
-
-    return false;
-}
-
-static bool nodeWillRespondToMouseEvents(Node& node)
-{
-    return node.willRespondToMouseClickEvents() || node.willRespondToMouseMoveEvents() || nodeIsMouseFocusable(node);
-}
-
-Node* Frame::approximateNodeAtViewportLocationLegacy(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation)
-{
-    // This function is only used for UIWebView.
-    auto&& ancestorRespondingToClickEvents = [](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
-        bool bodyHasBeenReached = false;
-        bool pointerCursorStillValid = true;
-
-        if (nodeBounds)
-            *nodeBounds = IntRect();
-
-        auto node = hitTestResult.innerNode();
-        if (!node)
-            return nullptr;
-
-        Node* pointerCursorNode = nullptr;
-        for (; node && node != terminationNode; node = node->parentInComposedTree()) {
-            // We only accept pointer nodes before reaching the body tag.
-            if (node->hasTagName(HTMLNames::bodyTag)) {
-                // Make sure we cover the case of an empty editable body.
-                if (!pointerCursorNode && node->isContentEditable())
-                    pointerCursorNode = node;
-                bodyHasBeenReached = true;
-                pointerCursorStillValid = false;
-            }
-
-            // If we already have a pointer, and we reach a table, don't accept it.
-            if (pointerCursorNode && (node->hasTagName(HTMLNames::tableTag) || node->hasTagName(HTMLNames::tbodyTag)))
-                pointerCursorStillValid = false;
-
-            // If we haven't reached the body, and we are still paying attention to pointer cursors, and the node has a pointer cursor.
-            if (pointerCursorStillValid && node->renderStyle() && node->renderStyle()->cursor() == CursorType::Pointer)
-                pointerCursorNode = node;
-            else if (pointerCursorNode) {
-                // We want the lowest unbroken chain of pointer cursors.
-                pointerCursorStillValid = false;
-            }
-
-            if (nodeWillRespondToMouseEvents(*node)) {
-                // If we're at the body or higher, use the pointer cursor node (which may be null).
-                if (bodyHasBeenReached)
-                    node = pointerCursorNode;
-
-                // If we are interested about the frame, use it.
-                if (nodeBounds) {
-                    // This is a check to see whether this node is an area element. The only way this can happen is if this is the first check.
-                    if (node == hitTestResult.innerNode() && node != hitTestResult.innerNonSharedNode() && is<HTMLAreaElement>(*node))
-                        *nodeBounds = snappedIntRect(downcast<HTMLAreaElement>(*node).computeRect(hitTestResult.innerNonSharedNode()->renderer()));
-                    else if (node && node->renderer())
-                        *nodeBounds = node->renderer()->absoluteBoundingBoxRect(true);
-                }
-
-                return node;
-            }
-        }
-
-        return nullptr;
-    };
-
-    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, WTFMove(ancestorRespondingToClickEvents), ShouldApproximate::Yes);
-}
-
-static inline NodeQualifier ancestorRespondingToClickEventsNodeQualifier(SecurityOrigin* securityOrigin = nullptr)
-{
-    return [securityOrigin](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
-        if (nodeBounds)
-            *nodeBounds = IntRect();
-
-        auto node = hitTestResult.innerNode();
-        if (!node || (securityOrigin && !securityOrigin->isSameOriginAs(node->document().securityOrigin())))
-            return nullptr;
-
-        for (; node && node != terminationNode; node = node->parentInComposedTree()) {
-            if (nodeWillRespondToMouseEvents(*node)) {
-                // If we are interested about the frame, use it.
-                if (nodeBounds) {
-                    // This is a check to see whether this node is an area element. The only way this can happen is if this is the first check.
-                    if (node == hitTestResult.innerNode() && node != hitTestResult.innerNonSharedNode() && is<HTMLAreaElement>(*node))
-                        *nodeBounds = snappedIntRect(downcast<HTMLAreaElement>(*node).computeRect(hitTestResult.innerNonSharedNode()->renderer()));
-                    else if (node && node->renderer())
-                        *nodeBounds = node->renderer()->absoluteBoundingBoxRect(true);
-                }
-
-                return node;
-            }
-        }
-
-        return nullptr;
-    };
-}
-
-Node* Frame::nodeRespondingToClickEvents(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation, SecurityOrigin* securityOrigin)
-{
-    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, ancestorRespondingToClickEventsNodeQualifier(securityOrigin), ShouldApproximate::Yes);
-}
-
-Node* Frame::nodeRespondingToDoubleClickEvent(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation)
-{
-    auto&& ancestorRespondingToDoubleClickEvent = [](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
-        if (nodeBounds)
-            *nodeBounds = IntRect();
-
-        auto* node = hitTestResult.innerNode();
-        if (!node)
-            return nullptr;
-
-        for (; node && node != terminationNode; node = node->parentInComposedTree()) {
-            if (!node->hasEventListeners(eventNames().dblclickEvent))
-                continue;
-#if ENABLE(TOUCH_EVENTS)
-            if (!node->allowsDoubleTapGesture())
-                continue;
-#endif
-            if (nodeBounds && node->renderer())
-                *nodeBounds = node->renderer()->absoluteBoundingBoxRect(true);
-            return node;
-        }
-        return nullptr;
-    };
-
-    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, WTFMove(ancestorRespondingToDoubleClickEvent), ShouldApproximate::Yes);
-}
-
-Node* Frame::nodeRespondingToInteraction(const FloatPoint& viewportLocation, FloatPoint& adjustedViewportLocation)
-{
-    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, ancestorRespondingToClickEventsNodeQualifier(), ShouldApproximate::Yes, ShouldFindRootEditableElement::No);
-}
-
-Node* Frame::nodeRespondingToScrollWheelEvents(const FloatPoint& viewportLocation)
-{
-    auto&& ancestorRespondingToScrollWheelEvents = [](const HitTestResult& hitTestResult, Node* terminationNode, IntRect* nodeBounds) -> Node* {
-        if (nodeBounds)
-            *nodeBounds = IntRect();
-
-        Node* scrollingAncestor = nullptr;
-        for (Node* node = hitTestResult.innerNode(); node && node != terminationNode && !node->hasTagName(HTMLNames::bodyTag); node = node->parentNode()) {
-            RenderObject* renderer = node->renderer();
-            if (!renderer)
-                continue;
-
-            if ((renderer->isTextField() || renderer->isTextArea()) && downcast<RenderTextControl>(*renderer).canScroll()) {
-                scrollingAncestor = node;
-                continue;
-            }
-
-            auto& style = renderer->style();
-
-            if (renderer->hasOverflowClip()
-                && (style.overflowY() == Overflow::Auto || style.overflowY() == Overflow::Scroll
-                || style.overflowX() == Overflow::Auto || style.overflowX() == Overflow::Scroll)) {
-                scrollingAncestor = node;
-            }
-        }
-
-        return scrollingAncestor;
-    };
-
-    FloatPoint adjustedViewportLocation;
-    return qualifyingNodeAtViewportLocation(viewportLocation, adjustedViewportLocation, WTFMove(ancestorRespondingToScrollWheelEvents), ShouldApproximate::No);
-}
-
 int Frame::preferredHeight() const
 {
     Document* document = this->document();
diff --git a/Source/WebCore/platform/Cairo.cmake b/Source/WebCore/platform/Cairo.cmake
index c1b53605713774dc006d028eda7c6a8213d6cca1..9135e67fa835ab3462b8898a9a75c9f5359eab92 100644
--- a/Source/WebCore/platform/Cairo.cmake
+++ b/Source/WebCore/platform/Cairo.cmake
@@ -16,6 +16,7 @@ list(APPEND WebCore_PRIVATE_FRAMEWORK_HEADERS
     platform/graphics/cairo/ImageBufferCairoBackend.h
     platform/graphics/cairo/ImageBufferCairoImageSurfaceBackend.h
     platform/graphics/cairo/ImageBufferCairoSurfaceBackend.h
+    platform/graphics/cairo/ImageBufferUtilitiesCairo.h
     platform/graphics/cairo/PlatformContextCairo.h
     platform/graphics/cairo/RefPtrCairo.h
 )
diff --git a/Source/WebCore/platform/PlatformKeyboardEvent.h b/Source/WebCore/platform/PlatformKeyboardEvent.h
index f423a4a1d5399326fc48fe4d4a8a8fb9d4df861e..b4b60162d8b0d34113df052b04a1695d481d266e 100644
--- a/Source/WebCore/platform/PlatformKeyboardEvent.h
+++ b/Source/WebCore/platform/PlatformKeyboardEvent.h
@@ -138,6 +138,7 @@ namespace WebCore {
         static String keyCodeForHardwareKeyCode(unsigned);
         static String keyIdentifierForGdkKeyCode(unsigned);
         static int windowsKeyCodeForGdkKeyCode(unsigned);
+        static unsigned gdkKeyCodeForWindowsKeyCode(int);
         static String singleCharacterString(unsigned);
         static bool modifiersContainCapsLock(unsigned);
 #endif
@@ -147,6 +148,7 @@ namespace WebCore {
         static String keyCodeForHardwareKeyCode(unsigned);
         static String keyIdentifierForWPEKeyCode(unsigned);
         static int windowsKeyCodeForWPEKeyCode(unsigned);
+        static unsigned WPEKeyCodeForWindowsKeyCode(int);
         static String singleCharacterString(unsigned);
 #endif
 
diff --git a/Source/WebCore/platform/PlatformScreen.cpp b/Source/WebCore/platform/PlatformScreen.cpp
index ba50b688ab6d0bae5d199fa0bac4b7e2004baf81..0b83a798b00835635a95a0db22173de094ba4035 100644
--- a/Source/WebCore/platform/PlatformScreen.cpp
+++ b/Source/WebCore/platform/PlatformScreen.cpp
@@ -25,6 +25,7 @@
 
 #include "config.h"
 #include "PlatformScreen.h"
+#include "RuntimeEnabledFeatures.h"
 
 #if PLATFORM(COCOA)
 
@@ -72,3 +73,16 @@ const ScreenData* screenData(PlatformDisplayID screenDisplayID)
 } // namespace WebCore
 
 #endif // PLATFORM(COCOA)
+
+#if ENABLE(TOUCH_EVENTS)
+namespace WebCore {
+
+bool screenHasTouchDevice() {
+    return RuntimeEnabledFeatures::sharedFeatures().touchEventsEnabled();
+}
+bool screenIsTouchPrimaryInputDevice() {
+    return RuntimeEnabledFeatures::sharedFeatures().isTouchPrimaryInputDevice();
+}
+
+} // namespace WebCore
+#endif
diff --git a/Source/WebCore/platform/PlatformScreen.h b/Source/WebCore/platform/PlatformScreen.h
index 92ce4dd6ec1821a0fc5135f38e233a5ccd04d719..3d723401a109f0e7ec8c052766d5f317f42df6a9 100644
--- a/Source/WebCore/platform/PlatformScreen.h
+++ b/Source/WebCore/platform/PlatformScreen.h
@@ -151,12 +151,14 @@ WEBCORE_EXPORT float screenScaleFactor(UIScreen * = nullptr);
 #endif
 
 #if ENABLE(TOUCH_EVENTS)
-#if PLATFORM(GTK) || PLATFORM(WPE)
 WEBCORE_EXPORT bool screenHasTouchDevice();
 WEBCORE_EXPORT bool screenIsTouchPrimaryInputDevice();
+#if PLATFORM(GTK) || PLATFORM(WPE)
+bool platformScreenHasTouchDevice();
+bool platformScreenIsTouchPrimaryInputDevice();
 #else
-constexpr bool screenHasTouchDevice() { return true; }
-constexpr bool screenIsTouchPrimaryInputDevice() { return true; }
+constexpr bool platformScreenHasTouchDevice() { return true; }
+constexpr bool platformScreenIsTouchPrimaryInputDevice() { return true; }
 #endif
 #endif
 
diff --git a/Source/WebCore/platform/ScrollableArea.h b/Source/WebCore/platform/ScrollableArea.h
index 851a02fcbb3e97691bf01d9b210971d9ae6d7949..550aedde204a64f74fa6ebe2fda3a44e18eeb5f6 100644
--- a/Source/WebCore/platform/ScrollableArea.h
+++ b/Source/WebCore/platform/ScrollableArea.h
@@ -109,7 +109,7 @@ public:
     void updateScrollSnapState();
 
 #if ENABLE(TOUCH_EVENTS)
-    virtual bool handleTouchEvent(const PlatformTouchEvent&);
+    WEBCORE_EXPORT virtual bool handleTouchEvent(const PlatformTouchEvent&);
 #endif
 
 #if PLATFORM(IOS_FAMILY)
diff --git a/Source/WebCore/platform/graphics/FontCascade.h b/Source/WebCore/platform/graphics/FontCascade.h
index 25c258b54271e01bee288fd83c7f015797bb399a..0de7f70b41402deb092ca341a5e36cb8e1c44eb2 100644
--- a/Source/WebCore/platform/graphics/FontCascade.h
+++ b/Source/WebCore/platform/graphics/FontCascade.h
@@ -283,7 +283,8 @@ private:
             return true;
         if (textRenderingMode == TextRenderingMode::OptimizeSpeed)
             return false;
-#if PLATFORM(COCOA) || USE(FREETYPE)
+        // WIN: quick fix for https://bugs.webkit.org/show_bug.cgi?id=201213
+#if PLATFORM(COCOA) || USE(FREETYPE) || PLATFORM(WIN)
         return true;
 #else
         return false;
diff --git a/Source/WebCore/platform/graphics/cairo/ImageBufferUtilitiesCairo.cpp b/Source/WebCore/platform/graphics/cairo/ImageBufferUtilitiesCairo.cpp
index d79728555b7db9b59cb615c55a7a7a6851cb57c8..61d3cc4b488e35ef9e1afa1ce3ac5f5d60ebe9a7 100644
--- a/Source/WebCore/platform/graphics/cairo/ImageBufferUtilitiesCairo.cpp
+++ b/Source/WebCore/platform/graphics/cairo/ImageBufferUtilitiesCairo.cpp
@@ -48,6 +48,13 @@
 #include <wtf/glib/GUniquePtr.h>
 #endif
 
+#if PLATFORM(WPE) || PLATFORM(WIN)
+#include <stdio.h> // Needed by jpeglib.h for FILE.
+extern "C" {
+#include "jpeglib.h"
+}
+#endif
+
 namespace WebCore {
 
 #if !PLATFORM(GTK)
@@ -65,8 +72,75 @@ static bool encodeImage(cairo_surface_t* image, const String& mimeType, Vector<u
     return cairo_surface_write_to_png_stream(image, writeFunction, output) == CAIRO_STATUS_SUCCESS;
 }
 
-Vector<uint8_t> data(cairo_surface_t* image, const String& mimeType, Optional<double>)
+static Vector<uint8_t> encodeJpeg(cairo_surface_t* image, int quality)
+{
+    if (cairo_surface_get_type(image) != CAIRO_SURFACE_TYPE_IMAGE) {
+        fprintf(stderr, "Unexpected cairo surface type: %d\n", cairo_surface_get_type(image));
+        return { };
+    }
+
+    if (cairo_image_surface_get_format(image) != CAIRO_FORMAT_ARGB32) {
+        fprintf(stderr, "Unexpected surface image format: %d\n", cairo_image_surface_get_format(image));
+        return { };
+    }
+
+    struct jpeg_compress_struct info;
+    struct jpeg_error_mgr error;
+    info.err = jpeg_std_error(&error);
+    jpeg_create_compress(&info);
+
+    unsigned char* bufferPtr = nullptr;
+    unsigned long bufferSize;
+    jpeg_mem_dest(&info, &bufferPtr, &bufferSize);
+    info.image_width = cairo_image_surface_get_width(image);
+    info.image_height = cairo_image_surface_get_height(image);
+
+#ifndef LIBJPEG_TURBO_VERSION
+    COMPILE_ASSERT(false, only_libjpeg_turbo_is_supported);
+#endif
+
+#if CPU(LITTLE_ENDIAN)
+    info.in_color_space = JCS_EXT_BGRA;
+#else
+    info.in_color_space = JCS_EXT_ARGB;
+#endif
+    // # of color components in input image
+    info.input_components = 4;
+
+    jpeg_set_defaults(&info);
+    jpeg_set_quality(&info, quality, true);
+
+    jpeg_start_compress(&info, true);
+
+    while (info.next_scanline < info.image_height)
+    {
+        JSAMPROW row = cairo_image_surface_get_data(image) + (info.next_scanline * cairo_image_surface_get_stride(image));
+        if (jpeg_write_scanlines(&info, &row, 1) != 1) {
+            fprintf(stderr, "JPEG library failed to encode line\n");
+            break;
+        }
+    }
+
+    jpeg_finish_compress(&info);
+    jpeg_destroy_compress(&info);
+
+    Vector<uint8_t> output;
+    output.append(bufferPtr, bufferSize);
+    // Cannot use unique_ptr as bufferPtr changes during compression. GUniquePtr would work
+    // but it's under GLib and won't work on Windows.
+    free(bufferPtr);
+    return output;
+}
+
+Vector<uint8_t> data(cairo_surface_t* image, const String& mimeType, Optional<double> quality)
 {
+    if (mimeType == "image/jpeg") {
+        int qualityPercent = 100;
+        if (quality)
+            qualityPercent = static_cast<int>(*quality * 100.0 + 0.5);
+        return encodeJpeg(image, qualityPercent);
+    }
+
     Vector<uint8_t> encodedImage;
     if (!image || !encodeImage(image, mimeType, &encodedImage))
         return { };
diff --git a/Source/WebCore/platform/graphics/cg/ImageBufferUtilitiesCG.h b/Source/WebCore/platform/graphics/cg/ImageBufferUtilitiesCG.h
index bc87758878d5163a938af8242c7a6800ea9bd13c..3d0751f8dfe1124bbe054daa2fa0c7552fecab32 100644
--- a/Source/WebCore/platform/graphics/cg/ImageBufferUtilitiesCG.h
+++ b/Source/WebCore/platform/graphics/cg/ImageBufferUtilitiesCG.h
@@ -42,7 +42,7 @@ WEBCORE_EXPORT uint8_t verifyImageBufferIsBigEnough(const void* buffer, size_t b
 CFStringRef jpegUTI();
 RetainPtr<CFStringRef> utiFromImageBufferMIMEType(const String&);
 
-bool encodeImage(CGImageRef, CFStringRef uti, Optional<double> quality, CFMutableDataRef);
+WEBCORE_EXPORT bool encodeImage(CGImageRef, CFStringRef uti, Optional<double> quality, CFMutableDataRef);
 
 String dataURL(CFDataRef, const String& mimeType);
 String dataURL(const ImageData&, const String& mimeType, Optional<double> quality);
diff --git a/Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLBase.cpp b/Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLBase.cpp
index 20bf2f4f984cc7f2bb73c6da559f0800a33a149c..f32f8564dd6bc19fbf615fb104cca5abfe39b361 100644
--- a/Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLBase.cpp
+++ b/Source/WebCore/platform/graphics/opengl/GraphicsContextGLOpenGLBase.cpp
@@ -27,7 +27,7 @@
 #include "config.h"
 #include "GraphicsContextGLOpenGL.h"
 
-#if ENABLE(GRAPHICS_CONTEXT_GL) && USE(OPENGL)
+#if !PLATFORM(WIN) && ENABLE(GRAPHICS_CONTEXT_GL) && USE(OPENGL)
 
 #include "ExtensionsGLOpenGL.h"
 #include "IntRect.h"
diff --git a/Source/WebCore/platform/graphics/win/ComplexTextControllerUniscribe.cpp b/Source/WebCore/platform/graphics/win/ComplexTextControllerUniscribe.cpp
index 774a52a28693bc51dde10a0875ea379afb06fd3c..cd714a7298fe4f5d2c9b580697a5c4cd22d25870 100644
--- a/Source/WebCore/platform/graphics/win/ComplexTextControllerUniscribe.cpp
+++ b/Source/WebCore/platform/graphics/win/ComplexTextControllerUniscribe.cpp
@@ -172,6 +172,33 @@ static Vector<unsigned> stringIndicesFromClusters(const Vector<WORD>& clusters,
     return stringIndices;
 }
 
+static int compactScriptItemsIfNeeded(const UChar* cp, unsigned stringLength, Vector<SCRIPT_ITEM>& items, int numItems, const Font* font)
+{
+    // https://bugs.webkit.org/show_bug.cgi?id=201214
+    // Uniscribe is overly aggressive in separating the runs. It'll split "3d_rotation" into "3", "d", "_" and "rotation" and we
+    // will ScriptShape them separately. As a result, a ligature for "3d_rotation" in the Material icon set
+    // (https://www.materialui.co/icon/3d-rotation) will not be used. A quick and dirty hack is to glue them back here, only making
+    // this apply to the readable characters, digits and _.
+
+    if (!numItems)
+        return numItems;
+
+    if (font->platformData().isSystemFont() || font->platformData().hasVariations())
+        return numItems;
+
+    bool allGoodCharacters = true;
+    for (unsigned i = 0; allGoodCharacters && i < stringLength; ++i) {
+        const UChar c = cp[i];
+        allGoodCharacters = (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_';
+    }
+    if (!allGoodCharacters)
+        return numItems;
+
+    // Consume entire string into a single run. |items| is at least numItems + 1 long.
+    items[1] = items[numItems];
+    return 1;
+}
+
 void ComplexTextController::collectComplexTextRunsForCharacters(const UChar* cp, unsigned stringLength, unsigned stringLocation, const Font* font)
 {
     if (!font) {
@@ -201,6 +228,8 @@ void ComplexTextController::collectComplexTextRunsForCharacters(const UChar* cp,
     }
     items.resize(numItems + 1);
 
+    numItems = compactScriptItemsIfNeeded(cp, stringLength, items, numItems, font);
+
     for (int i = 0; i < numItems; i++) {
         // Determine the string for this item.
         const UChar* str = cp + items[i].iCharPos;
diff --git a/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp b/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp
index 0516e70973e0078de6ad0216375d34dd9ef51a8d..ffd9a02deb5518e0c8c77b156815c11eb4b16829 100644
--- a/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp
+++ b/Source/WebCore/platform/gtk/PlatformKeyboardEventGtk.cpp
@@ -37,8 +37,10 @@
 #include "WindowsKeyboardCodes.h"
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
+#include <wtf/HashMap.h>
 #include <wtf/HexNumber.h>
 #include <wtf/glib/GUniquePtr.h>
+#include <mutex>
 
 namespace WebCore {
 
@@ -1294,6 +1296,246 @@ int PlatformKeyboardEvent::windowsKeyCodeForGdkKeyCode(unsigned keycode)
 
 }
 
+static const HashMap<int, unsigned>& gdkToWindowsKeyCodeMap()
+{
+    static HashMap<int, unsigned>* result;
+    static std::once_flag once;
+    std::call_once(
+        once,
+        [] {
+            const unsigned gdkKeyCodes[] = {
+                GDK_KEY_Cancel,
+                // FIXME: non-keypad keys should take precedence, so we skip GDK_KEY_KP_*
+                // GDK_KEY_KP_0,
+                // GDK_KEY_KP_1,
+                // GDK_KEY_KP_2,
+                // GDK_KEY_KP_3,
+                // GDK_KEY_KP_4,
+                // GDK_KEY_KP_5,
+                // GDK_KEY_KP_6,
+                // GDK_KEY_KP_7,
+                // GDK_KEY_KP_8,
+                // GDK_KEY_KP_9,
+                // GDK_KEY_KP_Multiply,
+                // GDK_KEY_KP_Add,
+                // GDK_KEY_KP_Subtract,
+                // GDK_KEY_KP_Decimal,
+                // GDK_KEY_KP_Divide,
+                // GDK_KEY_KP_Page_Up,
+                // GDK_KEY_KP_Page_Down,
+                // GDK_KEY_KP_End,
+                // GDK_KEY_KP_Home,
+                // GDK_KEY_KP_Left,
+                // GDK_KEY_KP_Up,
+                // GDK_KEY_KP_Right,
+                // GDK_KEY_KP_Down,
+                GDK_KEY_BackSpace,
+                // GDK_KEY_ISO_Left_Tab,
+                // GDK_KEY_3270_BackTab,
+                GDK_KEY_Tab,
+                GDK_KEY_Clear,
+                // GDK_KEY_ISO_Enter,
+                // GDK_KEY_KP_Enter,
+                GDK_KEY_Return,
+                GDK_KEY_Menu,
+                GDK_KEY_Pause,
+                GDK_KEY_AudioPause,
+                GDK_KEY_Caps_Lock,
+                GDK_KEY_Kana_Lock,
+                GDK_KEY_Kana_Shift,
+                GDK_KEY_Hangul,
+                GDK_KEY_Hangul_Hanja,
+                GDK_KEY_Kanji,
+                GDK_KEY_Escape,
+                GDK_KEY_space,
+                GDK_KEY_Page_Up,
+                GDK_KEY_Page_Down,
+                GDK_KEY_End,
+                GDK_KEY_Home,
+                GDK_KEY_Left,
+                GDK_KEY_Up,
+                GDK_KEY_Right,
+                GDK_KEY_Down,
+                GDK_KEY_Select,
+                GDK_KEY_Print,
+                GDK_KEY_Execute,
+                GDK_KEY_Insert,
+                GDK_KEY_KP_Insert,
+                GDK_KEY_Delete,
+                GDK_KEY_KP_Delete,
+                GDK_KEY_Help,
+                GDK_KEY_0,
+                GDK_KEY_parenright,
+                GDK_KEY_1,
+                GDK_KEY_exclam,
+                GDK_KEY_2,
+                GDK_KEY_at,
+                GDK_KEY_3,
+                GDK_KEY_numbersign,
+                GDK_KEY_4,
+                GDK_KEY_dollar,
+                GDK_KEY_5,
+                GDK_KEY_percent,
+                GDK_KEY_6,
+                GDK_KEY_asciicircum,
+                GDK_KEY_7,
+                GDK_KEY_ampersand,
+                GDK_KEY_8,
+                GDK_KEY_asterisk,
+                GDK_KEY_9,
+                GDK_KEY_parenleft,
+                GDK_KEY_a,
+                GDK_KEY_A,
+                GDK_KEY_b,
+                GDK_KEY_B,
+                GDK_KEY_c,
+                GDK_KEY_C,
+                GDK_KEY_d,
+                GDK_KEY_D,
+                GDK_KEY_e,
+                GDK_KEY_E,
+                GDK_KEY_f,
+                GDK_KEY_F,
+                GDK_KEY_g,
+                GDK_KEY_G,
+                GDK_KEY_h,
+                GDK_KEY_H,
+                GDK_KEY_i,
+                GDK_KEY_I,
+                GDK_KEY_j,
+                GDK_KEY_J,
+                GDK_KEY_k,
+                GDK_KEY_K,
+                GDK_KEY_l,
+                GDK_KEY_L,
+                GDK_KEY_m,
+                GDK_KEY_M,
+                GDK_KEY_n,
+                GDK_KEY_N,
+                GDK_KEY_o,
+                GDK_KEY_O,
+                GDK_KEY_p,
+                GDK_KEY_P,
+                GDK_KEY_q,
+                GDK_KEY_Q,
+                GDK_KEY_r,
+                GDK_KEY_R,
+                GDK_KEY_s,
+                GDK_KEY_S,
+                GDK_KEY_t,
+                GDK_KEY_T,
+                GDK_KEY_u,
+                GDK_KEY_U,
+                GDK_KEY_v,
+                GDK_KEY_V,
+                GDK_KEY_w,
+                GDK_KEY_W,
+                GDK_KEY_x,
+                GDK_KEY_X,
+                GDK_KEY_y,
+                GDK_KEY_Y,
+                GDK_KEY_z,
+                GDK_KEY_Z,
+                GDK_KEY_Meta_L,
+                GDK_KEY_Meta_R,
+                GDK_KEY_Sleep,
+                GDK_KEY_Num_Lock,
+                GDK_KEY_Scroll_Lock,
+                GDK_KEY_Shift_L,
+                GDK_KEY_Shift_R,
+                GDK_KEY_Control_L,
+                GDK_KEY_Control_R,
+                GDK_KEY_Alt_L,
+                GDK_KEY_Alt_R,
+                GDK_KEY_Back,
+                GDK_KEY_Forward,
+                GDK_KEY_Refresh,
+                GDK_KEY_Stop,
+                GDK_KEY_Search,
+                GDK_KEY_Favorites,
+                GDK_KEY_HomePage,
+                GDK_KEY_AudioMute,
+                GDK_KEY_AudioLowerVolume,
+                GDK_KEY_AudioRaiseVolume,
+                GDK_KEY_AudioNext,
+                GDK_KEY_AudioPrev,
+                GDK_KEY_AudioStop,
+                GDK_KEY_AudioMedia,
+                GDK_KEY_semicolon,
+                GDK_KEY_colon,
+                GDK_KEY_plus,
+                GDK_KEY_equal,
+                GDK_KEY_comma,
+                GDK_KEY_less,
+                GDK_KEY_minus,
+                GDK_KEY_underscore,
+                GDK_KEY_period,
+                GDK_KEY_greater,
+                GDK_KEY_slash,
+                GDK_KEY_question,
+                GDK_KEY_asciitilde,
+                GDK_KEY_quoteleft,
+                GDK_KEY_bracketleft,
+                GDK_KEY_braceleft,
+                GDK_KEY_backslash,
+                GDK_KEY_bar,
+                GDK_KEY_bracketright,
+                GDK_KEY_braceright,
+                GDK_KEY_quoteright,
+                GDK_KEY_quotedbl,
+                GDK_KEY_AudioRewind,
+                GDK_KEY_AudioForward,
+                GDK_KEY_AudioPlay,
+                GDK_KEY_F1,
+                GDK_KEY_F2,
+                GDK_KEY_F3,
+                GDK_KEY_F4,
+                GDK_KEY_F5,
+                GDK_KEY_F6,
+                GDK_KEY_F7,
+                GDK_KEY_F8,
+                GDK_KEY_F9,
+                GDK_KEY_F10,
+                GDK_KEY_F11,
+                GDK_KEY_F12,
+                GDK_KEY_F13,
+                GDK_KEY_F14,
+                GDK_KEY_F15,
+                GDK_KEY_F16,
+                GDK_KEY_F17,
+                GDK_KEY_F18,
+                GDK_KEY_F19,
+                GDK_KEY_F20,
+                GDK_KEY_F21,
+                GDK_KEY_F22,
+                GDK_KEY_F23,
+                GDK_KEY_F24,
+                GDK_KEY_VoidSymbol,
+                GDK_KEY_Red,
+                GDK_KEY_Green,
+                GDK_KEY_Yellow,
+                GDK_KEY_Blue,
+                GDK_KEY_PowerOff,
+                GDK_KEY_AudioRecord,
+                GDK_KEY_Display,
+                GDK_KEY_Subtitle,
+                GDK_KEY_Video
+            };
+            result = new HashMap<int, unsigned>();
+            for (unsigned gdkKeyCode : gdkKeyCodes) {
+                int winKeyCode = PlatformKeyboardEvent::windowsKeyCodeForGdkKeyCode(gdkKeyCode);
+                // If several gdk key codes map to the same win key code first one is used.
+                result->add(winKeyCode, gdkKeyCode);
+            }
+        });
+    return *result;
+}
+
+unsigned PlatformKeyboardEvent::gdkKeyCodeForWindowsKeyCode(int keycode)
+{
+    return gdkToWindowsKeyCodeMap().get(keycode);
+}
+
 String PlatformKeyboardEvent::singleCharacterString(unsigned val)
 {
     switch (val) {
diff --git a/Source/WebCore/platform/gtk/PlatformScreenGtk.cpp b/Source/WebCore/platform/gtk/PlatformScreenGtk.cpp
index e0e8809d8f39614b2b6bb8c7cf0f02652d574fe7..5d05504ec57869c9d6c6562c4237640099c295cd 100644
--- a/Source/WebCore/platform/gtk/PlatformScreenGtk.cpp
+++ b/Source/WebCore/platform/gtk/PlatformScreenGtk.cpp
@@ -218,7 +218,7 @@ bool screenSupportsExtendedColor(Widget*)
 }
 
 #if ENABLE(TOUCH_EVENTS)
-bool screenHasTouchDevice()
+bool platformScreenHasTouchDevice()
 {
     auto* display = gdk_display_get_default();
     if (!display)
@@ -228,7 +228,7 @@ bool screenHasTouchDevice()
     return seat ? gdk_seat_get_capabilities(seat) & GDK_SEAT_CAPABILITY_TOUCH : true;
 }
 
-bool screenIsTouchPrimaryInputDevice()
+bool platformScreenIsTouchPrimaryInputDevice()
 {
     auto* display = gdk_display_get_default();
     if (!display)
diff --git a/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp b/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp
index a34dc220bbb9a92b40dfb463e8724e81ac745b2c..8ecedd5dae88469366a619b96960598c1232a32d 100644
--- a/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp
+++ b/Source/WebCore/platform/libwpe/PlatformKeyboardEventLibWPE.cpp
@@ -30,8 +30,10 @@
 
 #include "WindowsKeyboardCodes.h"
 #include <wpe/wpe.h>
+#include <wtf/HashMap.h>
 #include <wtf/HexNumber.h>
 #include <wtf/text/StringBuilder.h>
+#include <mutex>
 
 namespace WebCore {
 
@@ -1291,6 +1293,246 @@ int PlatformKeyboardEvent::windowsKeyCodeForWPEKeyCode(unsigned keycode)
     return 0;
 }
 
+static const HashMap<int, unsigned>& WPEToWindowsKeyCodeMap()
+{
+    static HashMap<int, unsigned>* result;
+    static std::once_flag once;
+    std::call_once(
+        once,
+        [] {
+            const unsigned WPEKeyCodes[] = {
+                WPE_KEY_Cancel,
+                // FIXME: non-keypad keys should take precedence, so we skip WPE_KEY_KP_*
+                // WPE_KEY_KP_0,
+                // WPE_KEY_KP_1,
+                // WPE_KEY_KP_2,
+                // WPE_KEY_KP_3,
+                // WPE_KEY_KP_4,
+                // WPE_KEY_KP_5,
+                // WPE_KEY_KP_6,
+                // WPE_KEY_KP_7,
+                // WPE_KEY_KP_8,
+                // WPE_KEY_KP_9,
+                // WPE_KEY_KP_Multiply,
+                // WPE_KEY_KP_Add,
+                // WPE_KEY_KP_Subtract,
+                // WPE_KEY_KP_Decimal,
+                // WPE_KEY_KP_Divide,
+                // WPE_KEY_KP_Page_Up,
+                // WPE_KEY_KP_Page_Down,
+                // WPE_KEY_KP_End,
+                // WPE_KEY_KP_Home,
+                // WPE_KEY_KP_Left,
+                // WPE_KEY_KP_Up,
+                // WPE_KEY_KP_Right,
+                // WPE_KEY_KP_Down,
+                WPE_KEY_BackSpace,
+                // WPE_KEY_ISO_Left_Tab,
+                // WPE_KEY_3270_BackTab,
+                WPE_KEY_Tab,
+                WPE_KEY_Clear,
+                // WPE_KEY_ISO_Enter,
+                // WPE_KEY_KP_Enter,
+                WPE_KEY_Return,
+                WPE_KEY_Menu,
+                WPE_KEY_Pause,
+                WPE_KEY_AudioPause,
+                WPE_KEY_Caps_Lock,
+                WPE_KEY_Kana_Lock,
+                WPE_KEY_Kana_Shift,
+                WPE_KEY_Hangul,
+                WPE_KEY_Hangul_Hanja,
+                WPE_KEY_Kanji,
+                WPE_KEY_Escape,
+                WPE_KEY_space,
+                WPE_KEY_Page_Up,
+                WPE_KEY_Page_Down,
+                WPE_KEY_End,
+                WPE_KEY_Home,
+                WPE_KEY_Left,
+                WPE_KEY_Up,
+                WPE_KEY_Right,
+                WPE_KEY_Down,
+                WPE_KEY_Select,
+                WPE_KEY_Print,
+                WPE_KEY_Execute,
+                WPE_KEY_Insert,
+                WPE_KEY_KP_Insert,
+                WPE_KEY_Delete,
+                WPE_KEY_KP_Delete,
+                WPE_KEY_Help,
+                WPE_KEY_0,
+                WPE_KEY_parenright,
+                WPE_KEY_1,
+                WPE_KEY_exclam,
+                WPE_KEY_2,
+                WPE_KEY_at,
+                WPE_KEY_3,
+                WPE_KEY_numbersign,
+                WPE_KEY_4,
+                WPE_KEY_dollar,
+                WPE_KEY_5,
+                WPE_KEY_percent,
+                WPE_KEY_6,
+                WPE_KEY_asciicircum,
+                WPE_KEY_7,
+                WPE_KEY_ampersand,
+                WPE_KEY_8,
+                WPE_KEY_asterisk,
+                WPE_KEY_9,
+                WPE_KEY_parenleft,
+                WPE_KEY_a,
+                WPE_KEY_A,
+                WPE_KEY_b,
+                WPE_KEY_B,
+                WPE_KEY_c,
+                WPE_KEY_C,
+                WPE_KEY_d,
+                WPE_KEY_D,
+                WPE_KEY_e,
+                WPE_KEY_E,
+                WPE_KEY_f,
+                WPE_KEY_F,
+                WPE_KEY_g,
+                WPE_KEY_G,
+                WPE_KEY_h,
+                WPE_KEY_H,
+                WPE_KEY_i,
+                WPE_KEY_I,
+                WPE_KEY_j,
+                WPE_KEY_J,
+                WPE_KEY_k,
+                WPE_KEY_K,
+                WPE_KEY_l,
+                WPE_KEY_L,
+                WPE_KEY_m,
+                WPE_KEY_M,
+                WPE_KEY_n,
+                WPE_KEY_N,
+                WPE_KEY_o,
+                WPE_KEY_O,
+                WPE_KEY_p,
+                WPE_KEY_P,
+                WPE_KEY_q,
+                WPE_KEY_Q,
+                WPE_KEY_r,
+                WPE_KEY_R,
+                WPE_KEY_s,
+                WPE_KEY_S,
+                WPE_KEY_t,
+                WPE_KEY_T,
+                WPE_KEY_u,
+                WPE_KEY_U,
+                WPE_KEY_v,
+                WPE_KEY_V,
+                WPE_KEY_w,
+                WPE_KEY_W,
+                WPE_KEY_x,
+                WPE_KEY_X,
+                WPE_KEY_y,
+                WPE_KEY_Y,
+                WPE_KEY_z,
+                WPE_KEY_Z,
+                WPE_KEY_Meta_L,
+                WPE_KEY_Meta_R,
+                WPE_KEY_Sleep,
+                WPE_KEY_Num_Lock,
+                WPE_KEY_Scroll_Lock,
+                WPE_KEY_Shift_L,
+                WPE_KEY_Shift_R,
+                WPE_KEY_Control_L,
+                WPE_KEY_Control_R,
+                WPE_KEY_Alt_L,
+                WPE_KEY_Alt_R,
+                WPE_KEY_Back,
+                WPE_KEY_Forward,
+                WPE_KEY_Refresh,
+                WPE_KEY_Stop,
+                WPE_KEY_Search,
+                WPE_KEY_Favorites,
+                WPE_KEY_HomePage,
+                WPE_KEY_AudioMute,
+                WPE_KEY_AudioLowerVolume,
+                WPE_KEY_AudioRaiseVolume,
+                WPE_KEY_AudioNext,
+                WPE_KEY_AudioPrev,
+                WPE_KEY_AudioStop,
+                WPE_KEY_AudioMedia,
+                WPE_KEY_semicolon,
+                WPE_KEY_colon,
+                WPE_KEY_plus,
+                WPE_KEY_equal,
+                WPE_KEY_comma,
+                WPE_KEY_less,
+                WPE_KEY_minus,
+                WPE_KEY_underscore,
+                WPE_KEY_period,
+                WPE_KEY_greater,
+                WPE_KEY_slash,
+                WPE_KEY_question,
+                WPE_KEY_asciitilde,
+                WPE_KEY_quoteleft,
+                WPE_KEY_bracketleft,
+                WPE_KEY_braceleft,
+                WPE_KEY_backslash,
+                WPE_KEY_bar,
+                WPE_KEY_bracketright,
+                WPE_KEY_braceright,
+                WPE_KEY_quoteright,
+                WPE_KEY_quotedbl,
+                WPE_KEY_AudioRewind,
+                WPE_KEY_AudioForward,
+                WPE_KEY_AudioPlay,
+                WPE_KEY_F1,
+                WPE_KEY_F2,
+                WPE_KEY_F3,
+                WPE_KEY_F4,
+                WPE_KEY_F5,
+                WPE_KEY_F6,
+                WPE_KEY_F7,
+                WPE_KEY_F8,
+                WPE_KEY_F9,
+                WPE_KEY_F10,
+                WPE_KEY_F11,
+                WPE_KEY_F12,
+                WPE_KEY_F13,
+                WPE_KEY_F14,
+                WPE_KEY_F15,
+                WPE_KEY_F16,
+                WPE_KEY_F17,
+                WPE_KEY_F18,
+                WPE_KEY_F19,
+                WPE_KEY_F20,
+                WPE_KEY_F21,
+                WPE_KEY_F22,
+                WPE_KEY_F23,
+                WPE_KEY_F24,
+                WPE_KEY_VoidSymbol,
+                WPE_KEY_Red,
+                WPE_KEY_Green,
+                WPE_KEY_Yellow,
+                WPE_KEY_Blue,
+                WPE_KEY_PowerOff,
+                WPE_KEY_AudioRecord,
+                WPE_KEY_Display,
+                WPE_KEY_Subtitle,
+                WPE_KEY_Video
+            };
+            result = new HashMap<int, unsigned>();
+            for (unsigned WPEKeyCode : WPEKeyCodes) {
+                int winKeyCode = PlatformKeyboardEvent::windowsKeyCodeForWPEKeyCode(WPEKeyCode);
+                // If several gdk key codes map to the same win key code first one is used.
+                result->add(winKeyCode, WPEKeyCode);
+            }
+        });
+    return *result;
+}
+
+unsigned PlatformKeyboardEvent::WPEKeyCodeForWindowsKeyCode(int keycode)
+{
+    return WPEToWindowsKeyCodeMap().get(keycode);
+}
+
 String PlatformKeyboardEvent::singleCharacterString(unsigned val)
 {
     switch (val) {
diff --git a/Source/WebCore/platform/network/HTTPHeaderMap.cpp b/Source/WebCore/platform/network/HTTPHeaderMap.cpp
index 39cb560e54bf9efd2dad6e1fb60dd0f609daf6bf..91c132460d4b466f61a8c579f70329fdde3b130f 100644
--- a/Source/WebCore/platform/network/HTTPHeaderMap.cpp
+++ b/Source/WebCore/platform/network/HTTPHeaderMap.cpp
@@ -205,8 +205,11 @@ void HTTPHeaderMap::add(HTTPHeaderName name, const String& value)
     auto index = m_commonHeaders.findMatching([&](auto& header) {
         return header.key == name;
     });
+    // Align with Chromium and Firefox, but just for SetCookies where it is critical:
+    // https://bit.ly/2HCa0iq
+    String separator = name == HTTPHeaderName::SetCookie ? "\n " : ", ";
     if (index != notFound)
-        m_commonHeaders[index].value = makeString(m_commonHeaders[index].value, ", ", value);
+        m_commonHeaders[index].value = makeString(m_commonHeaders[index].value, separator, value);
     else
         m_commonHeaders.append(CommonHeader { name, value });
 }
diff --git a/Source/WebCore/platform/network/NetworkStateNotifier.h b/Source/WebCore/platform/network/NetworkStateNotifier.h
index 87930048f4fd18d6098af7de4da25be532df5931..2bb2afcf9473b0d5d97efbe18dd7b8145bc5f932 100644
--- a/Source/WebCore/platform/network/NetworkStateNotifier.h
+++ b/Source/WebCore/platform/network/NetworkStateNotifier.h
@@ -72,6 +72,7 @@ private:
 #endif
 
     Optional<bool> m_isOnLine;
+    Optional<bool> m_emulatedIsOnLine;
     Vector<WTF::Function<void(bool)>> m_listeners;
     Timer m_updateStateTimer;
 
diff --git a/Source/WebCore/platform/network/ResourceResponseBase.h b/Source/WebCore/platform/network/ResourceResponseBase.h
index ddab08a247db7b194fcc980308e12eb3f9bda697..cae230a8cfd31a633727574ee088c0fae4024e83 100644
--- a/Source/WebCore/platform/network/ResourceResponseBase.h
+++ b/Source/WebCore/platform/network/ResourceResponseBase.h
@@ -211,6 +211,8 @@ public:
 
     bool containsInvalidHTTPHeaders() const;
 
+    HTTPHeaderMap m_httpRequestHeaderFields;
+
 protected:
     enum InitLevel {
         Uninitialized,
@@ -293,6 +295,7 @@ void ResourceResponseBase::encode(Encoder& encoder) const
     encoder << m_httpStatusText;
     encoder << m_httpVersion;
     encoder << m_httpHeaderFields;
+    encoder << m_httpRequestHeaderFields;
 
     // We don't want to put the networkLoadMetrics info
     // into the disk cache, because we will never use the old info.
@@ -365,6 +368,12 @@ bool ResourceResponseBase::decode(Decoder& decoder, ResourceResponseBase& respon
         return false;
     response.m_httpHeaderFields = WTFMove(*httpHeaderFields);
 
+    Optional<HTTPHeaderMap> httpRequestHeaderFields;
+    decoder >> httpRequestHeaderFields;
+    if (!httpRequestHeaderFields)
+        return false;
+    response.m_httpRequestHeaderFields = WTFMove(*httpRequestHeaderFields);
+
     // The networkLoadMetrics info is only send over IPC and not stored in disk cache.
     if constexpr (Decoder::isIPCDecoder) {
         Optional<Box<NetworkLoadMetrics>> networkLoadMetrics;
diff --git a/Source/WebCore/platform/network/cf/SocketStreamHandleImpl.h b/Source/WebCore/platform/network/cf/SocketStreamHandleImpl.h
index d677280d2b5e7b053a240c155d64bc881f1737bb..1be949e09982b34366d162e6d45ebc51a76dcfb0 100644
--- a/Source/WebCore/platform/network/cf/SocketStreamHandleImpl.h
+++ b/Source/WebCore/platform/network/cf/SocketStreamHandleImpl.h
@@ -47,7 +47,7 @@ class SocketStreamHandleClient;
 
 class SocketStreamHandleImpl : public SocketStreamHandle {
 public:
-    static Ref<SocketStreamHandleImpl> create(const URL& url, SocketStreamHandleClient& client, PAL::SessionID sessionID, const String& credentialPartition, SourceApplicationAuditToken&& auditData, const StorageSessionProvider* provider) { return adoptRef(*new SocketStreamHandleImpl(url, client, sessionID, credentialPartition, WTFMove(auditData), provider)); }
+    static Ref<SocketStreamHandleImpl> create(const URL& url, bool ignoreCertificateErrors, SocketStreamHandleClient& client, PAL::SessionID sessionID, const String& credentialPartition, SourceApplicationAuditToken&& auditData, const StorageSessionProvider* provider) { return adoptRef(*new SocketStreamHandleImpl(url, ignoreCertificateErrors, client, sessionID, credentialPartition, WTFMove(auditData), provider)); }
 
     virtual ~SocketStreamHandleImpl();
 
@@ -61,7 +61,7 @@ private:
     Optional<size_t> platformSendInternal(const uint8_t*, size_t);
     bool sendPendingData();
 
-    WEBCORE_EXPORT SocketStreamHandleImpl(const URL&, SocketStreamHandleClient&, PAL::SessionID, const String& credentialPartition, SourceApplicationAuditToken&&, const StorageSessionProvider*);
+    WEBCORE_EXPORT SocketStreamHandleImpl(const URL&, bool ignoreCertificateErrors, SocketStreamHandleClient&, PAL::SessionID, const String& credentialPartition, SourceApplicationAuditToken&&, const StorageSessionProvider*);
     void createStreams();
     void scheduleStreams();
     void chooseProxy();
@@ -106,6 +106,7 @@ private:
     String m_credentialPartition;
     SourceApplicationAuditToken m_auditData;
     RefPtr<const StorageSessionProvider> m_storageSessionProvider;
+    bool m_ignoreCertificateErrors { false };
 
     StreamBuffer<uint8_t, 1024 * 1024> m_buffer;
     static const unsigned maxBufferSize = 100 * 1024 * 1024;
diff --git a/Source/WebCore/platform/network/cf/SocketStreamHandleImplCFNet.cpp b/Source/WebCore/platform/network/cf/SocketStreamHandleImplCFNet.cpp
index 9915f0ceacaf946eb4af2d6b740f7226e344b78d..4382ccde112e3c21892a4dd28fba416a6db90a62 100644
--- a/Source/WebCore/platform/network/cf/SocketStreamHandleImplCFNet.cpp
+++ b/Source/WebCore/platform/network/cf/SocketStreamHandleImplCFNet.cpp
@@ -96,7 +96,7 @@ static inline auto callbacksRunLoopMode()
 #endif
 }
 
-SocketStreamHandleImpl::SocketStreamHandleImpl(const URL& url, SocketStreamHandleClient& client, PAL::SessionID sessionID, const String& credentialPartition, SourceApplicationAuditToken&& auditData, const StorageSessionProvider* provider)
+SocketStreamHandleImpl::SocketStreamHandleImpl(const URL& url, bool ignoreCertificateErrors, SocketStreamHandleClient& client, PAL::SessionID sessionID, const String& credentialPartition, SourceApplicationAuditToken&& auditData, const StorageSessionProvider* provider)
     : SocketStreamHandle(url, client)
     , m_connectingSubstate(New)
     , m_connectionType(Unknown)
@@ -104,6 +104,7 @@ SocketStreamHandleImpl::SocketStreamHandleImpl(const URL& url, SocketStreamHandl
     , m_credentialPartition(credentialPartition)
     , m_auditData(WTFMove(auditData))
     , m_storageSessionProvider(provider)
+    , m_ignoreCertificateErrors(ignoreCertificateErrors)
 {
     LOG(Network, "SocketStreamHandle %p new client %p", this, &m_client);
 
@@ -360,7 +361,7 @@ void SocketStreamHandleImpl::createStreams()
     }
 
     if (shouldUseSSL()) {
-        CFBooleanRef validateCertificateChain = DeprecatedGlobalSettings::allowsAnySSLCertificate() ? kCFBooleanFalse : kCFBooleanTrue;
+        CFBooleanRef validateCertificateChain = m_ignoreCertificateErrors || DeprecatedGlobalSettings::allowsAnySSLCertificate() ? kCFBooleanFalse : kCFBooleanTrue;
         const void* keys[] = {
             kCFStreamSSLPeerName,
             kCFStreamSSLLevel,
diff --git a/Source/WebCore/platform/network/curl/CookieJarDB.h b/Source/WebCore/platform/network/curl/CookieJarDB.h
index 7c0ea47ece4ff0d472ce595c91ea1cfa90b25ca7..1c44229a18fe90f6e5e0c0056dddd09acadfe49b 100644
--- a/Source/WebCore/platform/network/curl/CookieJarDB.h
+++ b/Source/WebCore/platform/network/curl/CookieJarDB.h
@@ -72,7 +72,7 @@ public:
     WEBCORE_EXPORT ~CookieJarDB();
 
 private:
-    CookieAcceptPolicy m_acceptPolicy { CookieAcceptPolicy::Always };
+    CookieAcceptPolicy m_acceptPolicy { CookieAcceptPolicy::OnlyFromMainDocumentDomain };
     String m_databasePath;
 
     bool m_detectedDatabaseCorruption { false };
diff --git a/Source/WebCore/platform/network/curl/CurlStream.cpp b/Source/WebCore/platform/network/curl/CurlStream.cpp
index 1b15af01bcc0eab910fc3b9e8a8d463b7c668519..c11f0b310810fad74eacbd2c41ff16c2507111f1 100644
--- a/Source/WebCore/platform/network/curl/CurlStream.cpp
+++ b/Source/WebCore/platform/network/curl/CurlStream.cpp
@@ -33,7 +33,7 @@
 
 namespace WebCore {
 
-CurlStream::CurlStream(CurlStreamScheduler& scheduler, CurlStreamID streamID, URL&& url)
+CurlStream::CurlStream(CurlStreamScheduler& scheduler, CurlStreamID streamID, bool ignoreCertificateErrors, URL&& url)
     : m_scheduler(scheduler)
     , m_streamID(streamID)
 {
@@ -45,6 +45,9 @@ CurlStream::CurlStream(CurlStreamScheduler& scheduler, CurlStreamID streamID, UR
     m_curlHandle->setUrl(WTFMove(url));
 
     m_curlHandle->enableConnectionOnly();
+    if (ignoreCertificateErrors)
+        m_curlHandle->disableServerTrustEvaluation();
+
 
     auto errorCode = m_curlHandle->perform();
     if (errorCode != CURLE_OK) {
diff --git a/Source/WebCore/platform/network/curl/CurlStream.h b/Source/WebCore/platform/network/curl/CurlStream.h
index 313b0173da5cd404a1e3fcad9573b8ff7c3abd4f..020980a0f61d47e8c7929bfaab2f8394d014766d 100644
--- a/Source/WebCore/platform/network/curl/CurlStream.h
+++ b/Source/WebCore/platform/network/curl/CurlStream.h
@@ -50,12 +50,12 @@ public:
         virtual void didFail(CurlStreamID, CURLcode) = 0;
     };
 
-    static std::unique_ptr<CurlStream> create(CurlStreamScheduler& scheduler, CurlStreamID streamID, URL&& url)
+    static std::unique_ptr<CurlStream> create(CurlStreamScheduler& scheduler, CurlStreamID streamID, bool ignoreCertificateErrors, URL&& url)
     {
-        return WTF::makeUnique<CurlStream>(scheduler, streamID, WTFMove(url));
+        return WTF::makeUnique<CurlStream>(scheduler, streamID, ignoreCertificateErrors, WTFMove(url));
     }
 
-    CurlStream(CurlStreamScheduler&, CurlStreamID, URL&&);
+    CurlStream(CurlStreamScheduler&, CurlStreamID, bool ignoreCertificateErrors, URL&&);
     virtual ~CurlStream();
 
     void send(UniqueArray<uint8_t>&&, size_t);
diff --git a/Source/WebCore/platform/network/curl/CurlStreamScheduler.cpp b/Source/WebCore/platform/network/curl/CurlStreamScheduler.cpp
index 3fb8759984aa31a7d44baa2f69afe2fee461ea4f..bb7ad47477d97fa1eaff5d3da6b9a3705ff1e32f 100644
--- a/Source/WebCore/platform/network/curl/CurlStreamScheduler.cpp
+++ b/Source/WebCore/platform/network/curl/CurlStreamScheduler.cpp
@@ -40,7 +40,7 @@ CurlStreamScheduler::~CurlStreamScheduler()
     ASSERT(isMainThread());
 }
 
-CurlStreamID CurlStreamScheduler::createStream(const URL& url, CurlStream::Client& client)
+CurlStreamID CurlStreamScheduler::createStream(const URL& url, bool ignoreCertificateErrors, CurlStream::Client& client)
 {
     ASSERT(isMainThread());
 
@@ -51,8 +51,8 @@ CurlStreamID CurlStreamScheduler::createStream(const URL& url, CurlStream::Clien
     auto streamID = m_currentStreamID;
     m_clientList.add(streamID, &client);
 
-    callOnWorkerThread([this, streamID, url = url.isolatedCopy()]() mutable {
-        m_streamList.add(streamID, CurlStream::create(*this, streamID, WTFMove(url)));
+    callOnWorkerThread([this, streamID, ignoreCertificateErrors, url = url.isolatedCopy()]() mutable {
+        m_streamList.add(streamID, CurlStream::create(*this, streamID, ignoreCertificateErrors, WTFMove(url)));
     });
 
     return streamID;
diff --git a/Source/WebCore/platform/network/curl/CurlStreamScheduler.h b/Source/WebCore/platform/network/curl/CurlStreamScheduler.h
index 7d881206c9689f433227969c9b7f9ff268bdaaed..2e8118f11f87fa5f32adcedc165aec8220b36d58 100644
--- a/Source/WebCore/platform/network/curl/CurlStreamScheduler.h
+++ b/Source/WebCore/platform/network/curl/CurlStreamScheduler.h
@@ -38,7 +38,7 @@ public:
     CurlStreamScheduler();
     virtual ~CurlStreamScheduler();
 
-    CurlStreamID createStream(const URL&, CurlStream::Client&);
+    CurlStreamID createStream(const URL&, bool ignoreCertificateErrors, CurlStream::Client&);
     void destroyStream(CurlStreamID);
     void send(CurlStreamID, UniqueArray<uint8_t>&&, size_t);
 
diff --git a/Source/WebCore/platform/network/curl/SocketStreamHandleImpl.h b/Source/WebCore/platform/network/curl/SocketStreamHandleImpl.h
index fad4ef9198118f5e6e5ed7d3c14b99e574593451..a2d59843896f252fccdddbb94c5275eec6300f1b 100644
--- a/Source/WebCore/platform/network/curl/SocketStreamHandleImpl.h
+++ b/Source/WebCore/platform/network/curl/SocketStreamHandleImpl.h
@@ -44,7 +44,7 @@ class StorageSessionProvider;
 
 class SocketStreamHandleImpl : public SocketStreamHandle, public CurlStream::Client {
 public:
-    static Ref<SocketStreamHandleImpl> create(const URL& url, SocketStreamHandleClient& client, PAL::SessionID, const String&, SourceApplicationAuditToken&&, const StorageSessionProvider* provider) { return adoptRef(*new SocketStreamHandleImpl(url, client, provider)); }
+    static Ref<SocketStreamHandleImpl> create(const URL& url, bool ignoreCertificateErrors, SocketStreamHandleClient& client, PAL::SessionID, const String&, SourceApplicationAuditToken&&, const StorageSessionProvider* provider) { return adoptRef(*new SocketStreamHandleImpl(url, ignoreCertificateErrors, client, provider)); }
 
     virtual ~SocketStreamHandleImpl();
 
@@ -53,7 +53,7 @@ public:
     WEBCORE_EXPORT void platformClose() final;
 
 private:
-    WEBCORE_EXPORT SocketStreamHandleImpl(const URL&, SocketStreamHandleClient&, const StorageSessionProvider*);
+    WEBCORE_EXPORT SocketStreamHandleImpl(const URL&, bool ignoreCertificateErrors, SocketStreamHandleClient&, const StorageSessionProvider*);
 
     size_t bufferedAmount() final;
     Optional<size_t> platformSendInternal(const uint8_t*, size_t);
diff --git a/Source/WebCore/platform/network/curl/SocketStreamHandleImplCurl.cpp b/Source/WebCore/platform/network/curl/SocketStreamHandleImplCurl.cpp
index cae8c43d60fcf6a3d69c58a7436516f923d227cb..e6b03f378929abbd4437f8507ea2f6c563edcff7 100644
--- a/Source/WebCore/platform/network/curl/SocketStreamHandleImplCurl.cpp
+++ b/Source/WebCore/platform/network/curl/SocketStreamHandleImplCurl.cpp
@@ -43,7 +43,7 @@
 
 namespace WebCore {
 
-SocketStreamHandleImpl::SocketStreamHandleImpl(const URL& url, SocketStreamHandleClient& client, const StorageSessionProvider* provider)
+SocketStreamHandleImpl::SocketStreamHandleImpl(const URL& url, bool ignoreCertificateErrors, SocketStreamHandleClient& client, const StorageSessionProvider* provider)
     : SocketStreamHandle(url, client)
     , m_storageSessionProvider(provider)
     , m_scheduler(CurlContext::singleton().streamScheduler())
@@ -52,7 +52,7 @@ SocketStreamHandleImpl::SocketStreamHandleImpl(const URL& url, SocketStreamHandl
     if (m_url.protocolIs("wss") && DeprecatedGlobalSettings::allowsAnySSLCertificate())
         CurlContext::singleton().sslHandle().setIgnoreSSLErrors(true);
 
-    m_streamID = m_scheduler.createStream(m_url, *this);
+    m_streamID = m_scheduler.createStream(m_url, ignoreCertificateErrors, *this);
 }
 
 SocketStreamHandleImpl::~SocketStreamHandleImpl()
diff --git a/Source/WebCore/platform/network/soup/SocketStreamHandleImpl.h b/Source/WebCore/platform/network/soup/SocketStreamHandleImpl.h
index 3ecf866005da6da9cec7c7930e6a4f93cb39d6e0..d81dc9ac0c433e00ab4ad73e206856098ab9230e 100644
--- a/Source/WebCore/platform/network/soup/SocketStreamHandleImpl.h
+++ b/Source/WebCore/platform/network/soup/SocketStreamHandleImpl.h
@@ -47,7 +47,7 @@ class StorageSessionProvider;
 
 class SocketStreamHandleImpl final : public SocketStreamHandle {
 public:
-    static Ref<SocketStreamHandleImpl> create(const URL&, SocketStreamHandleClient&, PAL::SessionID, const String&, SourceApplicationAuditToken&&, const StorageSessionProvider*)
+    static Ref<SocketStreamHandleImpl> create(const URL&, bool, SocketStreamHandleClient&, PAL::SessionID, const String&, SourceApplicationAuditToken&&, const StorageSessionProvider*)
     {
         RELEASE_ASSERT_NOT_REACHED();
     }
diff --git a/Source/WebCore/platform/win/KeyEventWin.cpp b/Source/WebCore/platform/win/KeyEventWin.cpp
index 44737686187a06a92c408ea60b63a48ac8481334..c754a763688b52e7ddd47493296ef9b0c6adc527 100644
--- a/Source/WebCore/platform/win/KeyEventWin.cpp
+++ b/Source/WebCore/platform/win/KeyEventWin.cpp
@@ -239,10 +239,16 @@ PlatformKeyboardEvent::PlatformKeyboardEvent(HWND, WPARAM code, LPARAM keyData,
 {
 }
 
-void PlatformKeyboardEvent::disambiguateKeyDownEvent(Type, bool)
+void PlatformKeyboardEvent::disambiguateKeyDownEvent(Type type, bool backwardsCompatibility)
 {
-    // No KeyDown events on Windows to disambiguate.
-    ASSERT_NOT_REACHED();
+    m_type = type;
+    if (type == PlatformEvent::RawKeyDown) {
+        m_text = String();
+        m_unmodifiedText = String();
+    } else {
+        m_keyIdentifier = String();
+        m_windowsVirtualKeyCode = 0;
+    }
 }
 
 bool PlatformKeyboardEvent::currentCapsLockState()
diff --git a/Source/WebCore/platform/wpe/PlatformScreenWPE.cpp b/Source/WebCore/platform/wpe/PlatformScreenWPE.cpp
index 6b859de7a16bf05610f70cc561c15358a0f4b6be..6e09d6979042c69729c89c509bc0d9c944efbb5a 100644
--- a/Source/WebCore/platform/wpe/PlatformScreenWPE.cpp
+++ b/Source/WebCore/platform/wpe/PlatformScreenWPE.cpp
@@ -87,12 +87,12 @@ bool screenSupportsExtendedColor(Widget*)
 }
 
 #if ENABLE(TOUCH_EVENTS)
-bool screenHasTouchDevice()
+bool platformScreenHasTouchDevice()
 {
     return true;
 }
 
-bool screenIsTouchPrimaryInputDevice()
+bool platformScreenIsTouchPrimaryInputDevice()
 {
     return true;
 }
diff --git a/Source/WebCore/rendering/RenderTextControl.cpp b/Source/WebCore/rendering/RenderTextControl.cpp
index f575e13a0b6b3ae2d94c35ef90f5d5e0718678f4..8fa11add43a3a5e8609273657eaf3e6fab0c91dc 100644
--- a/Source/WebCore/rendering/RenderTextControl.cpp
+++ b/Source/WebCore/rendering/RenderTextControl.cpp
@@ -218,13 +218,13 @@ void RenderTextControl::layoutExcludedChildren(bool relayoutChildren)
     }
 }
 
-#if PLATFORM(IOS_FAMILY)
 bool RenderTextControl::canScroll() const
 {
     auto innerText = innerTextElement();
     return innerText && innerText->renderer() && innerText->renderer()->hasOverflowClip();
 }
 
+#if PLATFORM(IOS_FAMILY)
 int RenderTextControl::innerLineHeight() const
 {
     auto innerText = innerTextElement();
diff --git a/Source/WebCore/rendering/RenderTextControl.h b/Source/WebCore/rendering/RenderTextControl.h
index 69b193b1ff28bf2d0e58be6ae3152da8d9229a90..9b8327958cbc21e46a5720f558156b00e1c289a8 100644
--- a/Source/WebCore/rendering/RenderTextControl.h
+++ b/Source/WebCore/rendering/RenderTextControl.h
@@ -36,9 +36,9 @@ public:
 
     WEBCORE_EXPORT HTMLTextFormControlElement& textFormControlElement() const;
 
-#if PLATFORM(IOS_FAMILY)
     bool canScroll() const;
 
+#if PLATFORM(IOS_FAMILY)
     // Returns the line height of the inner renderer.
     int innerLineHeight() const override;
 #endif
diff --git a/Source/WebKit/NetworkProcess/NetworkProcess.cpp b/Source/WebKit/NetworkProcess/NetworkProcess.cpp
index 8a9d2f3939e7186b81e8a7efd4bbeb50a63b2f59..27a2bc078399fb45e5922f8b25a399d8859ed67f 100644
--- a/Source/WebKit/NetworkProcess/NetworkProcess.cpp
+++ b/Source/WebKit/NetworkProcess/NetworkProcess.cpp
@@ -26,7 +26,6 @@
 
 #include "config.h"
 #include "NetworkProcess.h"
-
 #include "ArgumentCoders.h"
 #include "Attachment.h"
 #include "AuthenticationManager.h"
@@ -551,6 +550,41 @@ void NetworkProcess::destroySession(PAL::SessionID sessionID)
 #endif
 }
 
+void NetworkProcess::getAllCookies(PAL::SessionID sessionID, CompletionHandler<void(Vector<WebCore::Cookie>&&)>&& completionHandler)
+{
+    if (auto* networkStorageSession = storageSession(sessionID)) {
+        completionHandler(networkStorageSession->getAllCookies());
+        return;
+    }
+    completionHandler({ });
+}
+
+void NetworkProcess::setCookies(PAL::SessionID sessionID, Vector<WebCore::Cookie> cookies, CompletionHandler<void(bool)>&& completionHandler) {
+    if (auto* networkStorageSession = storageSession(sessionID)) {
+        for (auto cookie : cookies)
+            networkStorageSession->setCookie(cookie);
+        completionHandler(true);
+        return;
+    }
+    completionHandler(false);
+}
+
+void NetworkProcess::deleteAllCookies(PAL::SessionID sessionID, CompletionHandler<void(bool)>&& completionHandler)
+{
+    if (auto* networkStorageSession = storageSession(sessionID)) {
+        networkStorageSession->deleteAllCookies();
+        completionHandler(true);
+        return;
+    }
+    completionHandler(false);
+}
+
+void NetworkProcess::setIgnoreCertificateErrors(PAL::SessionID sessionID, bool ignore)
+{
+    if (auto* networkSession = this->networkSession(sessionID))
+        networkSession->setIgnoreCertificateErrors(ignore);
+}
+
 #if ENABLE(RESOURCE_LOAD_STATISTICS)
 void NetworkProcess::dumpResourceLoadStatistics(PAL::SessionID sessionID, CompletionHandler<void(String)>&& completionHandler)
 {
diff --git a/Source/WebKit/NetworkProcess/NetworkProcess.h b/Source/WebKit/NetworkProcess/NetworkProcess.h
index be526eff1e8c91d36ea89b87e7b567958a956fb2..8f30b10e1c3b2db015caaeeb531afdb24b2d5c5e 100644
--- a/Source/WebKit/NetworkProcess/NetworkProcess.h
+++ b/Source/WebKit/NetworkProcess/NetworkProcess.h
@@ -77,6 +77,7 @@ class SessionID;
 
 namespace WebCore {
 class CertificateInfo;
+struct Cookie;
 class CurlProxySettings;
 class ProtectionSpace;
 class StorageQuotaManager;
@@ -204,6 +205,11 @@ public:
 
     void addWebsiteDataStore(WebsiteDataStoreParameters&&);
 
+    void getAllCookies(PAL::SessionID, CompletionHandler<void(Vector<WebCore::Cookie>&&)>&&);
+    void setCookies(PAL::SessionID, Vector<WebCore::Cookie>, CompletionHandler<void(bool)>&&);
+    void deleteAllCookies(PAL::SessionID, CompletionHandler<void(bool)>&&);
+    void setIgnoreCertificateErrors(PAL::SessionID, bool);
+
 #if ENABLE(RESOURCE_LOAD_STATISTICS)
     void clearPrevalentResource(PAL::SessionID, const RegistrableDomain&, CompletionHandler<void()>&&);
     void clearUserInteraction(PAL::SessionID, const RegistrableDomain&, CompletionHandler<void()>&&);
diff --git a/Source/WebKit/NetworkProcess/NetworkProcess.messages.in b/Source/WebKit/NetworkProcess/NetworkProcess.messages.in
index 0f019056e5b57f5334b8ce73826e2fa0568893bf..87a876a19ecabcc4481447cf067b400eb9cc62c3 100644
--- a/Source/WebKit/NetworkProcess/NetworkProcess.messages.in
+++ b/Source/WebKit/NetworkProcess/NetworkProcess.messages.in
@@ -79,6 +79,11 @@ messages -> NetworkProcess LegacyReceiver {
 
     PreconnectTo(PAL::SessionID sessionID, WebKit::WebPageProxyIdentifier webPageProxyID, WebCore::PageIdentifier webPageID, URL url, String userAgent, enum:uint8_t WebCore::StoredCredentialsPolicy storedCredentialsPolicy, enum:bool Optional<WebKit::NavigatingToAppBoundDomain> isNavigatingToAppBoundDomain);
 
+    GetAllCookies(PAL::SessionID sessionID) -> (Vector<WebCore::Cookie> cookies) Async
+    SetCookies(PAL::SessionID sessionID, Vector<WebCore::Cookie> cookies) -> (bool success) Async
+    DeleteAllCookies(PAL::SessionID sessionID) -> (bool success) Async
+    SetIgnoreCertificateErrors(PAL::SessionID sessionID, bool ignoreTLSErrors)
+
 #if ENABLE(RESOURCE_LOAD_STATISTICS)
     ClearPrevalentResource(PAL::SessionID sessionID, WebCore::RegistrableDomain resourceDomain) -> () Async
     ClearUserInteraction(PAL::SessionID sessionID, WebCore::RegistrableDomain resourceDomain) -> () Async
diff --git a/Source/WebKit/NetworkProcess/NetworkSession.h b/Source/WebKit/NetworkProcess/NetworkSession.h
index ca4a57667d4b4ac92047bc7942177101ff3bba2f..d675932c8ca95d0b1888b59142ca9dbd29e6f0f5 100644
--- a/Source/WebKit/NetworkProcess/NetworkSession.h
+++ b/Source/WebKit/NetworkProcess/NetworkSession.h
@@ -144,6 +144,9 @@ public:
 
     bool isStaleWhileRevalidateEnabled() const { return m_isStaleWhileRevalidateEnabled; }
 
+    void setIgnoreCertificateErrors(bool ignore) { m_ignoreCertificateErrors = ignore; }
+    bool ignoreCertificateErrors() { return m_ignoreCertificateErrors; }
+
 #if ENABLE(SERVICE_WORKER)
     void addSoftUpdateLoader(std::unique_ptr<ServiceWorkerSoftUpdateLoader>&& loader) { m_softUpdateLoaders.add(WTFMove(loader)); }
     void removeSoftUpdateLoader(ServiceWorkerSoftUpdateLoader* loader) { m_softUpdateLoaders.remove(loader); }
@@ -176,6 +179,7 @@ protected:
 #endif
     bool m_isStaleWhileRevalidateEnabled { false };
     UniqueRef<PrivateClickMeasurementManager> m_privateClickMeasurement;
+    bool m_ignoreCertificateErrors { false };
 
     HashSet<Ref<NetworkResourceLoader>> m_keptAliveLoads;
 
diff --git a/Source/WebKit/NetworkProcess/NetworkSocketStream.cpp b/Source/WebKit/NetworkProcess/NetworkSocketStream.cpp
index 5b489cc538f7c071510106c58f5c094ec9a8e1b8..20d0718eb896bcd9f97fd80572844a5727d84e40 100644
--- a/Source/WebKit/NetworkProcess/NetworkSocketStream.cpp
+++ b/Source/WebKit/NetworkProcess/NetworkSocketStream.cpp
@@ -44,7 +44,7 @@ Ref<NetworkSocketStream> NetworkSocketStream::create(NetworkProcess& networkProc
 NetworkSocketStream::NetworkSocketStream(NetworkProcess& networkProcess, URL&& url, PAL::SessionID sessionID, const String& credentialPartition, WebSocketIdentifier identifier, IPC::Connection& connection, SourceApplicationAuditToken&& auditData)
     : m_identifier(identifier)
     , m_connection(connection)
-    , m_impl(SocketStreamHandleImpl::create(url, *this, sessionID, credentialPartition, WTFMove(auditData), NetworkStorageSessionProvider::create(networkProcess, sessionID).ptr()))
+    , m_impl(SocketStreamHandleImpl::create(url, networkProcess.networkSession(sessionID)->ignoreCertificateErrors(), *this, sessionID, credentialPartition, WTFMove(auditData), NetworkStorageSessionProvider::create(networkProcess, sessionID).ptr()))
     , m_delayFailTimer(*this, &NetworkSocketStream::sendDelayedFailMessage)
 {
 }
diff --git a/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm b/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm
index 8a8ab0b9b831caf48fa22453098afb24aaa8f4de..ef6d00552b15870a72189d76a744455434d28bf8 100644
--- a/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm
+++ b/Source/WebKit/NetworkProcess/cocoa/NetworkSessionCocoa.mm
@@ -661,7 +661,7 @@ static inline void processServerTrustEvaluation(NetworkSessionCocoa& session, Se
     NegotiatedLegacyTLS negotiatedLegacyTLS = NegotiatedLegacyTLS::No;
 
     if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
-        if (NetworkSessionCocoa::allowsSpecificHTTPSCertificateForHost(challenge))
+        if (sessionCocoa->ignoreCertificateErrors() || sessionCocoa->allowsSpecificHTTPSCertificateForHost(challenge))
             return completionHandler(NSURLSessionAuthChallengeUseCredential, [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]);
 
 #if HAVE(TLS_PROTOCOL_VERSION_T)
@@ -914,6 +914,13 @@ static inline void processServerTrustEvaluation(NetworkSessionCocoa& session, Se
         // NetworkLoadMetrics. For example, PerformanceTiming.
         resourceResponse.setDeprecatedNetworkLoadMetrics(WebCore::copyTimingData([dataTask _timingData]));
 
+        __block WebCore::HTTPHeaderMap requestHeaders;
+        NSURLSessionTaskTransactionMetrics *m = dataTask._incompleteTaskMetrics.transactionMetrics.lastObject;
+        [m.request.allHTTPHeaderFields enumerateKeysAndObjectsUsingBlock:^(NSString *name, NSString *value, BOOL *) {
+            requestHeaders.set(String(name), String(value));
+        }];
+        resourceResponse.m_httpRequestHeaderFields = WTFMove(requestHeaders);
+
         auto completionHandlerCopy = Block_copy(completionHandler);
         networkDataTask->didReceiveResponse(WTFMove(resourceResponse), negotiatedLegacyTLS, [completionHandlerCopy, taskIdentifier](WebCore::PolicyAction policyAction) {
 #if !LOG_DISABLED
diff --git a/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.cpp b/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.cpp
index 27f8ef54e561d6c3e812f8d4dc4cc133634fb4eb..a8a0c6fecd5f4fc816b02dccf276ed92573ad7b2 100644
--- a/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.cpp
+++ b/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.cpp
@@ -26,9 +26,13 @@
 #include "config.h"
 #include "NetworkDataTaskCurl.h"
 
+#include "APIError.h"
 #include "AuthenticationChallengeDisposition.h"
 #include "AuthenticationManager.h"
+#include "DataReference.h"
+#include "Download.h"
 #include "NetworkSessionCurl.h"
+#include "NetworkProcess.h"
 #include <WebCore/AuthenticationChallenge.h>
 #include <WebCore/CookieJar.h>
 #include <WebCore/CurlRequest.h>
@@ -39,6 +43,8 @@
 #include <WebCore/SameSiteInfo.h>
 #include <WebCore/ShouldRelaxThirdPartyCookieBlocking.h>
 #include <WebCore/SynchronousLoaderClient.h>
+#include <WebCore/TextEncoding.h>
+#include <wtf/FileSystem.h>
 
 namespace WebKit {
 
@@ -78,6 +84,8 @@ NetworkDataTaskCurl::NetworkDataTaskCurl(NetworkSession& session, NetworkDataTas
         m_curlRequest->setUserPass(m_initialCredential.user(), m_initialCredential.password());
         m_curlRequest->setAuthenticationScheme(ProtectionSpaceAuthenticationSchemeHTTPBasic);
     }
+    if (m_session->ignoreCertificateErrors())
+        m_curlRequest->disableServerTrustEvaluation();
     m_curlRequest->setStartTime(m_startTime);
     m_curlRequest->start();
 }
@@ -152,6 +160,7 @@ void NetworkDataTaskCurl::curlDidReceiveResponse(CurlRequest& request, CurlRespo
     m_response = ResourceResponse(receivedResponse);
     m_response.setCertificateInfo(WTFMove(receivedResponse.certificateInfo));
     m_response.setDeprecatedNetworkLoadMetrics(Box<NetworkLoadMetrics>::create(WTFMove(receivedResponse.networkLoadMetrics)));
+    m_response.m_httpRequestHeaderFields = request.resourceRequest().httpHeaderFields();
 
     handleCookieHeaders(request.resourceRequest(), receivedResponse);
 
@@ -179,7 +188,12 @@ void NetworkDataTaskCurl::curlDidReceiveBuffer(CurlRequest&, Ref<SharedBuffer>&&
     auto protectedThis = makeRef(*this);
     if (state() == State::Canceling || state() == State::Completed || (!m_client && !isDownload()))
         return;
-
+    if (isDownload()) {
+        FileSystem::PlatformFileHandle file = FileSystem::openFile(m_pendingDownloadLocation, FileSystem::FileOpenMode::Write);
+        FileSystem::writeToFile(file, buffer->data(), buffer->size());
+        FileSystem::closeFile(file);
+        return;
+    }
     m_client->didReceiveData(WTFMove(buffer));
 }
 
@@ -188,6 +202,12 @@ void NetworkDataTaskCurl::curlDidComplete(CurlRequest&, NetworkLoadMetrics&& net
     if (state() == State::Canceling || state() == State::Completed || (!m_client && !isDownload()))
         return;
 
+    if (isDownload()) {
+        auto* download = m_session->networkProcess().downloadManager().download(m_pendingDownloadID);
+        ASSERT(download);
+        download->didFinish();
+        return;
+    }
     m_client->didCompleteWithError({ }, WTFMove(networkLoadMetrics));
 }
 
@@ -201,6 +221,13 @@ void NetworkDataTaskCurl::curlDidFailWithError(CurlRequest& request, ResourceErr
         return;
     }
 
+    if (isDownload()) {
+        auto* download = m_session->networkProcess().downloadManager().download(m_pendingDownloadID);
+        ASSERT(download);
+        download->didFail(resourceError, IPC::DataReference());
+        return;
+    }
+
     m_client->didCompleteWithError(resourceError);
 }
 
@@ -238,6 +265,18 @@ void NetworkDataTaskCurl::invokeDidReceiveResponse()
         case PolicyAction::Ignore:
             invalidateAndCancel();
             break;
+        case PolicyAction::Download: {
+            FileSystem::deleteFile(m_pendingDownloadLocation);
+            auto& downloadManager = m_session->networkProcess().downloadManager();
+            auto download = makeUnique<Download>(downloadManager, m_pendingDownloadID, *this, *m_session, suggestedFilename());
+            auto* downloadPtr = download.get();
+            downloadManager.dataTaskBecameDownloadTask(m_pendingDownloadID, WTFMove(download));
+            downloadPtr->didCreateDestination(m_pendingDownloadLocation);
+
+            if (m_curlRequest)
+                m_curlRequest->completeDidReceiveResponse();
+            break;
+        }
         default:
             notImplemented();
             break;
@@ -320,6 +359,8 @@ void NetworkDataTaskCurl::willPerformHTTPRedirection()
             m_curlRequest->setUserPass(m_initialCredential.user(), m_initialCredential.password());
             m_curlRequest->setAuthenticationScheme(ProtectionSpaceAuthenticationSchemeHTTPBasic);
         }
+        if (m_session->ignoreCertificateErrors())
+            m_curlRequest->disableServerTrustEvaluation();
         m_curlRequest->setStartTime(m_startTime);
         m_curlRequest->start();
 
@@ -503,4 +544,16 @@ bool NetworkDataTaskCurl::isThirdPartyRequest(const WebCore::ResourceRequest& re
     return !WebCore::areRegistrableDomainsEqual(request.url(), request.firstPartyForCookies());
 }
 
+String NetworkDataTaskCurl::suggestedFilename() const
+{
+    if (!m_suggestedFilename.isEmpty())
+        return m_suggestedFilename;
+
+    String suggestedFilename = m_response.suggestedFilename();
+    if (!suggestedFilename.isEmpty())
+        return suggestedFilename;
+
+    return decodeURLEscapeSequences(m_response.url().lastPathComponent());
+}
+
 } // namespace WebKit
diff --git a/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.h b/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.h
index 4c120d6830582861432e5e58fba5707206350cd0..3509c62ac2c970fdcf78db2503c0cc4259f56dbd 100644
--- a/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.h
+++ b/Source/WebKit/NetworkProcess/curl/NetworkDataTaskCurl.h
@@ -85,6 +85,7 @@ private:
 
     void appendCookieHeader(WebCore::ResourceRequest&);
     void handleCookieHeaders(const WebCore::ResourceRequest&, const WebCore::CurlResponse&);
+    String suggestedFilename() const override;
 
     bool isThirdPartyRequest(const WebCore::ResourceRequest&);
     bool shouldBlockCookies(const WebCore::ResourceRequest&);
diff --git a/Source/WebKit/NetworkProcess/soup/NetworkDataTaskSoup.cpp b/Source/WebKit/NetworkProcess/soup/NetworkDataTaskSoup.cpp
index c99bcb07366b88ceb0c4f2a8382750f0e2d99b50..e7325b8f817cc73bf835b706d6cc382b6acc0ed2 100644
--- a/Source/WebKit/NetworkProcess/soup/NetworkDataTaskSoup.cpp
+++ b/Source/WebKit/NetworkProcess/soup/NetworkDataTaskSoup.cpp
@@ -444,6 +444,8 @@ bool NetworkDataTaskSoup::tlsConnectionAcceptCertificate(GTlsCertificate* certif
 {
     ASSERT(m_soupRequest);
     URL url = soupURIToURL(soup_request_get_uri(m_soupRequest.get()));
+    if (m_session->ignoreCertificateErrors())
+        return true;
     auto error = static_cast<NetworkSessionSoup&>(*m_session).soupNetworkSession().checkTLSErrors(url, certificate, tlsErrors);
     if (!error)
         return true;
@@ -893,6 +895,7 @@ void NetworkDataTaskSoup::didGetHeaders()
         const char* headerValue;
         while (soup_message_headers_iter_next(&headersIter, &headerName, &headerValue))
             requestHeaders.set(String(headerName), String(headerValue));
+        m_response.m_httpRequestHeaderFields = requestHeaders;
         m_networkLoadMetrics.requestHeaders = WTFMove(requestHeaders);
     }
 }
diff --git a/Source/WebKit/NetworkProcess/soup/NetworkSessionSoup.cpp b/Source/WebKit/NetworkProcess/soup/NetworkSessionSoup.cpp
index 66ff36eec2db1699a9bc2bce8fe0d5124ce19ed2..cc2bda254ce55d574c36b07dbaf95093c782e3a0 100644
--- a/Source/WebKit/NetworkProcess/soup/NetworkSessionSoup.cpp
+++ b/Source/WebKit/NetworkProcess/soup/NetworkSessionSoup.cpp
@@ -112,6 +112,11 @@ static gboolean webSocketAcceptCertificateCallback(GTlsConnection* connection, G
     return !session->soupNetworkSession().checkTLSErrors(soupURIToURL(soup_message_get_uri(soupMessage)), certificate, errors);
 }
 
+static gboolean webSocketAcceptCertificateCallbackIgnoreTLSErrors(GTlsConnection* connection, GTlsCertificate* certificate, GTlsCertificateFlags errors, NetworkSessionSoup* session)
+{
+    return TRUE;
+}
+
 static void webSocketMessageNetworkEventCallback(SoupMessage* soupMessage, GSocketClientEvent event, GIOStream* connection, NetworkSessionSoup* session)
 {
     if (event != G_SOCKET_CLIENT_TLS_HANDSHAKING)
@@ -121,6 +126,15 @@ static void webSocketMessageNetworkEventCallback(SoupMessage* soupMessage, GSock
     g_signal_connect(connection, "accept-certificate", G_CALLBACK(webSocketAcceptCertificateCallback), session);
 }
 
+static void webSocketMessageNetworkEventCallbackIgnoreTLSErrors(SoupMessage* soupMessage, GSocketClientEvent event, GIOStream* connection)
+{
+    if (event != G_SOCKET_CLIENT_TLS_HANDSHAKING)
+        return;
+
+    g_object_set_data(G_OBJECT(connection), "wk-soup-message", soupMessage);
+    g_signal_connect(connection, "accept-certificate", G_CALLBACK(webSocketAcceptCertificateCallbackIgnoreTLSErrors), soupMessage);
+}
+
 std::unique_ptr<WebSocketTask> NetworkSessionSoup::createWebSocketTask(NetworkSocketChannel& channel, const ResourceRequest& request, const String& protocol)
 {
     GUniquePtr<SoupURI> soupURI = request.createSoupURI();
@@ -129,8 +143,12 @@ std::unique_ptr<WebSocketTask> NetworkSessionSoup::createWebSocketTask(NetworkSo
 
     GRefPtr<SoupMessage> soupMessage = adoptGRef(soup_message_new_from_uri(SOUP_METHOD_GET, soupURI.get()));
     request.updateSoupMessage(soupMessage.get(), blobRegistry());
-    if (request.url().protocolIs("wss"))
-        g_signal_connect(soupMessage.get(), "network-event", G_CALLBACK(webSocketMessageNetworkEventCallback), this);
+    if (request.url().protocolIs("wss")) {
+        if (ignoreCertificateErrors())
+          g_signal_connect(soupMessage.get(), "network-event", G_CALLBACK(webSocketMessageNetworkEventCallbackIgnoreTLSErrors), this);
+        else
+          g_signal_connect(soupMessage.get(), "network-event", G_CALLBACK(webSocketMessageNetworkEventCallback), this);
+    }
     return makeUnique<WebSocketTask>(channel, soupSession(), soupMessage.get(), protocol);
 }
 
diff --git a/Source/WebKit/PlatformGTK.cmake b/Source/WebKit/PlatformGTK.cmake
index 715d38d76b891489ef95a74e31389b8844ebf102..d86a1c3cdee68b5646a109d9bf56056634c54cb2 100644
--- a/Source/WebKit/PlatformGTK.cmake
+++ b/Source/WebKit/PlatformGTK.cmake
@@ -444,6 +444,9 @@ list(APPEND WebKit_SYSTEM_INCLUDE_DIRECTORIES
     ${GSTREAMER_PBUTILS_INCLUDE_DIRS}
     ${GTK_INCLUDE_DIRS}
     ${LIBSOUP_INCLUDE_DIRS}
+# Playwright begin
+    ${LIBVPX_INCLUDE_DIRS}
+# Playwright end
 )
 
 if (USE_WPE_RENDERER)
@@ -497,9 +500,18 @@ if (USE_LIBWEBRTC)
     list(APPEND WebKit_SYSTEM_INCLUDE_DIRECTORIES
         "${THIRDPARTY_DIR}/libwebrtc/Source/"
         "${THIRDPARTY_DIR}/libwebrtc/Source/webrtc"
+# Playwright begin
+        "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/include"
+# Playwright end
     )
 endif ()
 
+# Playwright begin
+list(APPEND WebKit_PRIVATE_INCLUDE_DIRECTORIES
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libwebm"
+)
+# Playwright end
+
 # To generate WebKitEnumTypes.h we want to use all installed headers, except WebKitEnumTypes.h itself.
 set(WebKit2GTK_ENUM_GENERATION_HEADERS ${WebKit2GTK_INSTALLED_HEADERS})
 list(REMOVE_ITEM WebKit2GTK_ENUM_GENERATION_HEADERS ${DERIVED_SOURCES_WEBKIT2GTK_API_DIR}/WebKitEnumTypes.h)
diff --git a/Source/WebKit/PlatformWPE.cmake b/Source/WebKit/PlatformWPE.cmake
index a0d83b7d0a54da2e9c9c39b56473743ae48fa9b4..d3b097c89887fb69d374d904691390594c2acd88 100644
--- a/Source/WebKit/PlatformWPE.cmake
+++ b/Source/WebKit/PlatformWPE.cmake
@@ -257,6 +257,7 @@ list(APPEND WebKit_INCLUDE_DIRECTORIES
     "${WEBKIT_DIR}/UIProcess/API/wpe"
     "${WEBKIT_DIR}/UIProcess/CoordinatedGraphics"
     "${WEBKIT_DIR}/UIProcess/geoclue"
+    "${WEBKIT_DIR}/UIProcess/glib"
     "${WEBKIT_DIR}/UIProcess/gstreamer"
     "${WEBKIT_DIR}/UIProcess/linux"
     "${WEBKIT_DIR}/UIProcess/soup"
@@ -281,8 +282,17 @@ list(APPEND WebKit_SYSTEM_INCLUDE_DIRECTORIES
     ${GIO_UNIX_INCLUDE_DIRS}
     ${GLIB_INCLUDE_DIRS}
     ${LIBSOUP_INCLUDE_DIRS}
+# Playwright begin
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/include"
+# Playwright end
 )
 
+# Playwright begin
+list(APPEND WebKit_PRIVATE_INCLUDE_DIRECTORIES
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libwebm"
+)
+# Playwright end
+
 list(APPEND WebKit_LIBRARIES
     Cairo::Cairo
     Freetype::Freetype
diff --git a/Source/WebKit/PlatformWin.cmake b/Source/WebKit/PlatformWin.cmake
index 75a506d6a95c9b02afadf47edd259b725b8a2f6d..36f8ac2934c509eff9566f135c2a499eceb42fd8 100644
--- a/Source/WebKit/PlatformWin.cmake
+++ b/Source/WebKit/PlatformWin.cmake
@@ -58,8 +58,12 @@ list(APPEND WebKit_SOURCES
 
     UIProcess/WebsiteData/win/WebsiteDataStoreWin.cpp
 
+    UIProcess/win/InspectorTargetProxyWin.cpp
+    UIProcess/win/InspectorPlaywrightAgentClientWin.cpp
     UIProcess/win/PageClientImpl.cpp
     UIProcess/win/WebContextMenuProxyWin.cpp
+    UIProcess/win/WebPageInspectorEmulationAgentWin.cpp
+    UIProcess/win/WebPageInspectorInputAgentWin.cpp
     UIProcess/win/WebPageProxyWin.cpp
     UIProcess/win/WebPopupMenuProxyWin.cpp
     UIProcess/win/WebProcessPoolWin.cpp
@@ -116,6 +120,63 @@ list(APPEND WebKit_INCLUDE_DIRECTORIES
     "${WEBKIT_DIR}/win"
 )
 
+# Playwright begin
+list(APPEND WebKit_SYSTEM_INCLUDE_DIRECTORIES
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/include"
+    "${LIBVPX_CUSTOM_INCLUDE_DIR}"
+)
+
+list(APPEND WebKit_PRIVATE_INCLUDE_DIRECTORIES
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libwebm"
+)
+
+list(APPEND WebKit_SOURCES
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libwebm/mkvmuxer/mkvmuxer.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libwebm/mkvmuxer/mkvmuxerutil.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libwebm/mkvmuxer/mkvwriter.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/compare.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/compare_common.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/compare_gcc.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/compare_win.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert_argb.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert_from.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert_from_argb.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert_jpeg.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert_to_argb.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/convert_to_i420.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/cpu_id.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/mjpeg_decoder.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/mjpeg_validate.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/planar_functions.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/compare_neon.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/compare_neon64.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_any.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_argb.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_common.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_gcc.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_neon.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_neon64.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/rotate_win.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/row_any.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/row_common.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/row_gcc.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/row_neon.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/row_neon64.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/row_win.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_any.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_argb.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_common.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_gcc.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_neon.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_neon64.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/scale_win.cc"
+    "${THIRDPARTY_DIR}/libwebrtc/Source/third_party/libyuv/source/video_common.cc"
+)
+# Playwright end
+
 set(WebKitCommonIncludeDirectories ${WebKit_INCLUDE_DIRECTORIES})
 set(WebKitCommonSystemIncludeDirectories ${WebKit_SYSTEM_INCLUDE_DIRECTORIES})
 
@@ -169,6 +230,7 @@ if (${WTF_PLATFORM_WIN_CAIRO})
         OpenSSL::SSL
         mfuuid.lib
         strmiids.lib
+        ${LIBVPX_CUSTOM_LIBRARY}
     )
 endif ()
 
diff --git a/Source/WebKit/Shared/API/c/wpe/WebKit.h b/Source/WebKit/Shared/API/c/wpe/WebKit.h
index 898e30b370db8176e886fbbde0cd960e38a64818..74945e06fac0eb14936578de6a599a123364a63a 100644
--- a/Source/WebKit/Shared/API/c/wpe/WebKit.h
+++ b/Source/WebKit/Shared/API/c/wpe/WebKit.h
@@ -78,6 +78,7 @@
 // From Source/WebKit/UIProcess/API/C
 #include <WebKit/WKBackForwardListItemRef.h>
 #include <WebKit/WKBackForwardListRef.h>
+#include <WebKit/WKBrowserInspector.h>
 #include <WebKit/WKContext.h>
 #include <WebKit/WKContextConfigurationRef.h>
 #include <WebKit/WKCredential.h>
diff --git a/Source/WebKit/Shared/NativeWebKeyboardEvent.h b/Source/WebKit/Shared/NativeWebKeyboardEvent.h
index fd2b55f40fdd3d82d6d6947dc33ad31f24f4c1c7..bb1487b1efcbab2fd7ccf79a50eae99ecf4b4cab 100644
--- a/Source/WebKit/Shared/NativeWebKeyboardEvent.h
+++ b/Source/WebKit/Shared/NativeWebKeyboardEvent.h
@@ -33,6 +33,7 @@
 #if USE(APPKIT)
 #include <wtf/RetainPtr.h>
 OBJC_CLASS NSView;
+OBJC_CLASS NSEvent;
 #endif
 
 #if PLATFORM(GTK)
@@ -65,19 +66,35 @@ public:
 #if USE(APPKIT)
     // FIXME: Share iOS's HandledByInputMethod enum here instead of passing a boolean.
     NativeWebKeyboardEvent(NSEvent *, bool handledByInputMethod, bool replacesSoftSpace, const Vector<WebCore::KeypressCommand>&);
+    NativeWebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp, Vector<WebCore::KeypressCommand>&& commands)
+        : WebKeyboardEvent(type, text, unmodifiedText, key, code, keyIdentifier, windowsVirtualKeyCode, nativeVirtualKeyCode, isAutoRepeat, isKeypad, isSystemKey, modifiers, timestamp, WTFMove(commands))
+    {
+    }
 #elif PLATFORM(GTK)
     NativeWebKeyboardEvent(const NativeWebKeyboardEvent&);
     NativeWebKeyboardEvent(GdkEvent*, const String&, Vector<String>&& commands);
     NativeWebKeyboardEvent(const String&, Optional<Vector<WebCore::CompositionUnderline>>&&, Optional<EditingRange>&&);
     NativeWebKeyboardEvent(Type, const String& text, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, Vector<String>&& commands, bool isKeypad, OptionSet<Modifier>);
+    NativeWebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp, Vector<String>&& commands)
+        : WebKeyboardEvent(type, text, unmodifiedText, key, code, keyIdentifier, windowsVirtualKeyCode, nativeVirtualKeyCode, isAutoRepeat, isKeypad, isSystemKey, modifiers, timestamp, WTFMove(commands))
+    {
+    }
 #elif PLATFORM(IOS_FAMILY)
     enum class HandledByInputMethod : bool { No, Yes };
     NativeWebKeyboardEvent(::WebEvent *, HandledByInputMethod);
 #elif USE(LIBWPE)
     enum class HandledByInputMethod : bool { No, Yes };
     NativeWebKeyboardEvent(struct wpe_input_keyboard_event*, const String&, HandledByInputMethod, Optional<Vector<WebCore::CompositionUnderline>>&&, Optional<EditingRange>&&);
+    NativeWebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp)
+        : WebKeyboardEvent(type, text, unmodifiedText, key, code, keyIdentifier, windowsVirtualKeyCode, nativeVirtualKeyCode, isAutoRepeat, isKeypad, isSystemKey, modifiers, timestamp)
+    {
+    }
 #elif PLATFORM(WIN)
     NativeWebKeyboardEvent(HWND, UINT message, WPARAM, LPARAM, Vector<MSG>&& pendingCharEvents);
+    NativeWebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp)
+        : WebKeyboardEvent(type, text, unmodifiedText, key, code, keyIdentifier, windowsVirtualKeyCode, nativeVirtualKeyCode, isAutoRepeat, isKeypad, isSystemKey, modifiers, timestamp)
+    {
+    }
 #endif
 
 #if USE(APPKIT)
diff --git a/Source/WebKit/Shared/NativeWebMouseEvent.h b/Source/WebKit/Shared/NativeWebMouseEvent.h
index 5e37f73510f73961d97ce8b42de0e1935a170d9b..7e30ef0830d7d98717b7e0cd3935cc2b1803518f 100644
--- a/Source/WebKit/Shared/NativeWebMouseEvent.h
+++ b/Source/WebKit/Shared/NativeWebMouseEvent.h
@@ -76,6 +76,11 @@ public:
     NativeWebMouseEvent(HWND, UINT message, WPARAM, LPARAM, bool);
 #endif
 
+#if PLATFORM(GTK) || USE(LIBWPE) || PLATFORM(WIN)
+    NativeWebMouseEvent(Type type, Button button, unsigned short buttons, const WebCore::IntPoint& position, const WebCore::IntPoint& globalPosition, float deltaX, float deltaY, float deltaZ, int clickCount, OptionSet<Modifier> modifiers, WallTime timestamp)
+       : WebMouseEvent(type, button, buttons, position, globalPosition, deltaX, deltaY, deltaZ, clickCount, modifiers, timestamp) { }
+#endif
+
 #if USE(APPKIT)
     NSEvent* nativeEvent() const { return m_nativeEvent.get(); }
 #elif PLATFORM(GTK)
diff --git a/Source/WebKit/Shared/WebCoreArgumentCoders.cpp b/Source/WebKit/Shared/WebCoreArgumentCoders.cpp
index 9c26db4e9a9f6ba72e4820bb406c2cfbde113e9b..b7ccbbcc7e5595ea2f921d8d26acdd68f8cab10b 100644
--- a/Source/WebKit/Shared/WebCoreArgumentCoders.cpp
+++ b/Source/WebKit/Shared/WebCoreArgumentCoders.cpp
@@ -1438,6 +1438,9 @@ void ArgumentCoder<WindowFeatures>::encode(Encoder& encoder, const WindowFeature
     encoder << windowFeatures.resizable;
     encoder << windowFeatures.fullscreen;
     encoder << windowFeatures.dialog;
+    encoder << windowFeatures.noopener;
+    encoder << windowFeatures.noreferrer;
+    encoder << windowFeatures.additionalFeatures;
 }
 
 bool ArgumentCoder<WindowFeatures>::decode(Decoder& decoder, WindowFeatures& windowFeatures)
@@ -1466,6 +1469,12 @@ bool ArgumentCoder<WindowFeatures>::decode(Decoder& decoder, WindowFeatures& win
         return false;
     if (!decoder.decode(windowFeatures.dialog))
         return false;
+    if (!decoder.decode(windowFeatures.noopener))
+        return false;
+    if (!decoder.decode(windowFeatures.noreferrer))
+        return false;
+    if (!decoder.decode(windowFeatures.additionalFeatures))
+        return false;
     return true;
 }
 
diff --git a/Source/WebKit/Shared/WebEvent.h b/Source/WebKit/Shared/WebEvent.h
index 3ae6504779d3917a79f69f32b58260afeda270b4..72d44c33953cc13bf2ed7c762b4f9a7b88571b56 100644
--- a/Source/WebKit/Shared/WebEvent.h
+++ b/Source/WebKit/Shared/WebEvent.h
@@ -31,6 +31,7 @@
 
 #include <wtf/EnumTraits.h>
 #include <wtf/OptionSet.h>
+#include <wtf/RefCounted.h>
 #include <wtf/WallTime.h>
 #include <wtf/text/WTFString.h>
 
diff --git a/Source/WebKit/Shared/WebKeyboardEvent.cpp b/Source/WebKit/Shared/WebKeyboardEvent.cpp
index bc4322286484e6afdd49353fae6a8fb3cd5e66f2..7af88c4e93f6a0ea61dd107699c04c0695f7842f 100644
--- a/Source/WebKit/Shared/WebKeyboardEvent.cpp
+++ b/Source/WebKit/Shared/WebKeyboardEvent.cpp
@@ -35,6 +35,7 @@ WebKeyboardEvent::WebKeyboardEvent()
 {
 }
 
+
 #if USE(APPKIT)
 
 WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, int macCharCode, bool handledByInputMethod, const Vector<WebCore::KeypressCommand>& commands, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp)
@@ -56,6 +57,24 @@ WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String&
     ASSERT(isKeyboardEventType(type));
 }
 
+WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp, Vector<WebCore::KeypressCommand>&& commands)
+    : WebEvent(type, modifiers, timestamp)
+    , m_text(text)
+    , m_unmodifiedText(text)
+    , m_key(key)
+    , m_code(code)
+    , m_keyIdentifier(keyIdentifier)
+    , m_windowsVirtualKeyCode(windowsVirtualKeyCode)
+    , m_nativeVirtualKeyCode(nativeVirtualKeyCode)
+    , m_macCharCode(0)
+    , m_commands(WTFMove(commands))
+    , m_isAutoRepeat(isAutoRepeat)
+    , m_isKeypad(isKeypad)
+    , m_isSystemKey(isSystemKey)
+{
+    ASSERT(isKeyboardEventType(type));
+}
+
 #elif PLATFORM(GTK)
 
 WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool handledByInputMethod, Optional<Vector<WebCore::CompositionUnderline>>&& preeditUnderlines, Optional<EditingRange>&& preeditSelectionRange, Vector<String>&& commands, bool isKeypad, OptionSet<Modifier> modifiers, WallTime timestamp)
@@ -79,6 +98,24 @@ WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String&
     ASSERT(isKeyboardEventType(type));
 }
 
+WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp, Vector<String>&& commands)
+    : WebEvent(type, modifiers, timestamp)
+    , m_text(text)
+    , m_unmodifiedText(text)
+    , m_key(key)
+    , m_code(code)
+    , m_keyIdentifier(keyIdentifier)
+    , m_windowsVirtualKeyCode(windowsVirtualKeyCode)
+    , m_nativeVirtualKeyCode(nativeVirtualKeyCode)
+    , m_macCharCode(0)
+    , m_commands(WTFMove(commands))
+    , m_isAutoRepeat(isAutoRepeat)
+    , m_isKeypad(isKeypad)
+    , m_isSystemKey(isSystemKey)
+{
+    ASSERT(isKeyboardEventType(type));
+}
+
 #elif PLATFORM(IOS_FAMILY)
 
 WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, int macCharCode, bool handledByInputMethod, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp)
@@ -144,6 +181,27 @@ WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String&
 
 #endif
 
+#if PLATFORM(WIN) || USE(LIBWPE)
+
+WebKeyboardEvent::WebKeyboardEvent(Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier> modifiers, WallTime timestamp)
+    : WebEvent(type, modifiers, timestamp)
+    , m_text(text)
+    , m_unmodifiedText(text)
+    , m_key(key)
+    , m_code(code)
+    , m_keyIdentifier(keyIdentifier)
+    , m_windowsVirtualKeyCode(windowsVirtualKeyCode)
+    , m_nativeVirtualKeyCode(nativeVirtualKeyCode)
+    , m_macCharCode(0)
+    , m_isAutoRepeat(isAutoRepeat)
+    , m_isKeypad(isKeypad)
+    , m_isSystemKey(isSystemKey)
+{
+    ASSERT(isKeyboardEventType(type));
+}
+
+#endif
+
 WebKeyboardEvent::~WebKeyboardEvent()
 {
 }
diff --git a/Source/WebKit/Shared/WebKeyboardEvent.h b/Source/WebKit/Shared/WebKeyboardEvent.h
index cb8029dc46dc2531f5cc23409dc6d2f11d5a3b49..a0e673b9680b0013d56920e525f358e333b06b0b 100644
--- a/Source/WebKit/Shared/WebKeyboardEvent.h
+++ b/Source/WebKit/Shared/WebKeyboardEvent.h
@@ -43,14 +43,18 @@ public:
 
 #if USE(APPKIT)
     WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, int macCharCode, bool handledByInputMethod, const Vector<WebCore::KeypressCommand>&, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp);
+    WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp, Vector<WebCore::KeypressCommand>&& commands);
 #elif PLATFORM(GTK)
     WebKeyboardEvent(Type, const String& text, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool handledByInputMethod, Optional<Vector<WebCore::CompositionUnderline>>&&, Optional<EditingRange>&&, Vector<String>&& commands, bool isKeypad, OptionSet<Modifier>, WallTime timestamp);
+    WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp, Vector<String>&& commands);
 #elif PLATFORM(IOS_FAMILY)
     WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, int macCharCode, bool handledByInputMethod, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp);
 #elif USE(LIBWPE)
     WebKeyboardEvent(Type, const String& text, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool handledByInputMethod, Optional<Vector<WebCore::CompositionUnderline>>&&, Optional<EditingRange>&&, bool isKeypad, OptionSet<Modifier>, WallTime timestamp);
+    WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp);
 #else
     WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, int macCharCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp);
+    WebKeyboardEvent(Type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<Modifier>, WallTime timestamp);
 #endif
 
     const String& text() const { return m_text; }
diff --git a/Source/WebKit/Shared/WebPageCreationParameters.cpp b/Source/WebKit/Shared/WebPageCreationParameters.cpp
index b3a9199e85bc7972cb891949da032f7c141fe939..60ba6392951228fae844936e974adbb1e91fdafc 100644
--- a/Source/WebKit/Shared/WebPageCreationParameters.cpp
+++ b/Source/WebKit/Shared/WebPageCreationParameters.cpp
@@ -152,6 +152,8 @@ void WebPageCreationParameters::encode(IPC::Encoder& encoder) const
     encoder << crossOriginAccessControlCheckEnabled;
     encoder << processDisplayName;
 
+    encoder << shouldPauseInInspectorWhenShown;
+
     encoder << shouldCaptureAudioInUIProcess;
     encoder << shouldCaptureAudioInGPUProcess;
     encoder << shouldCaptureVideoInUIProcess;
@@ -494,7 +496,10 @@ Optional<WebPageCreationParameters> WebPageCreationParameters::decode(IPC::Decod
     if (!processDisplayName)
         return WTF::nullopt;
     parameters.processDisplayName = WTFMove(*processDisplayName);
-    
+
+    if (!decoder.decode(parameters.shouldPauseInInspectorWhenShown))
+        return WTF::nullopt;
+
     if (!decoder.decode(parameters.shouldCaptureAudioInUIProcess))
         return WTF::nullopt;
 
diff --git a/Source/WebKit/Shared/WebPageCreationParameters.h b/Source/WebKit/Shared/WebPageCreationParameters.h
index 0bbaac0a850b13bb99d58e634667aae5c23c110a..f34b126dfc58b419e7ae543fa43de82cecfece38 100644
--- a/Source/WebKit/Shared/WebPageCreationParameters.h
+++ b/Source/WebKit/Shared/WebPageCreationParameters.h
@@ -241,6 +241,8 @@ struct WebPageCreationParameters {
 
     WebCore::ShouldRelaxThirdPartyCookieBlocking shouldRelaxThirdPartyCookieBlocking { WebCore::ShouldRelaxThirdPartyCookieBlocking::No };
 
+    bool shouldPauseInInspectorWhenShown { false };
+
 #if PLATFORM(GTK)
     String themeName;
 #endif
diff --git a/Source/WebKit/Shared/gtk/NativeWebKeyboardEventGtk.cpp b/Source/WebKit/Shared/gtk/NativeWebKeyboardEventGtk.cpp
index c76a9e1f7dae7a31c4048d8f00d849a18ebaff23..1cfd9c7acb69dea69783c42b3f427929509782a4 100644
--- a/Source/WebKit/Shared/gtk/NativeWebKeyboardEventGtk.cpp
+++ b/Source/WebKit/Shared/gtk/NativeWebKeyboardEventGtk.cpp
@@ -50,7 +50,7 @@ NativeWebKeyboardEvent::NativeWebKeyboardEvent(Type type, const String& text, co
 }
 
 NativeWebKeyboardEvent::NativeWebKeyboardEvent(const NativeWebKeyboardEvent& event)
-    : WebKeyboardEvent(event.type(), event.text(), event.key(), event.code(), event.keyIdentifier(), event.windowsVirtualKeyCode(), event.nativeVirtualKeyCode(), event.handledByInputMethod(), Optional<Vector<WebCore::CompositionUnderline>>(event.preeditUnderlines()), Optional<EditingRange>(event.preeditSelectionRange()), Vector<String>(event.commands()), event.isKeypad(), event.modifiers(), event.timestamp())
+    : WebKeyboardEvent(event)
     , m_nativeEvent(event.nativeEvent() ? gdk_event_copy(event.nativeEvent()) : nullptr)
 {
 }
diff --git a/Source/WebKit/Shared/gtk/NativeWebMouseEventGtk.cpp b/Source/WebKit/Shared/gtk/NativeWebMouseEventGtk.cpp
index 66fcf27bcdd78e9c4d2b73e1e05830575bc9c05d..656c79494d4224b958ce338c5ebe0f0bfb8d8977 100644
--- a/Source/WebKit/Shared/gtk/NativeWebMouseEventGtk.cpp
+++ b/Source/WebKit/Shared/gtk/NativeWebMouseEventGtk.cpp
@@ -54,7 +54,7 @@ NativeWebMouseEvent::NativeWebMouseEvent(Type type, Button button, unsigned shor
 }
 
 NativeWebMouseEvent::NativeWebMouseEvent(const NativeWebMouseEvent& event)
-    : WebMouseEvent(event.type(), event.button(), event.buttons(), event.position(), event.globalPosition(), event.deltaX(), event.deltaY(), event.deltaZ(), event.clickCount(), event.modifiers(), event.timestamp())
+    : WebMouseEvent(event)
     , m_nativeEvent(event.nativeEvent() ? gdk_event_copy(const_cast<GdkEvent*>(event.nativeEvent())) : nullptr)
 {
 }
diff --git a/Source/WebKit/Shared/ios/WebPlatformTouchPointIOS.cpp b/Source/WebKit/Shared/ios/WebPlatformTouchPointIOS.cpp
index 2a9db4f8acafe9d64d5d4ebd9913aa161ea0f4c0..f151ef4e8e6abb5e3044771c235139d48e8aa7cf 100644
--- a/Source/WebKit/Shared/ios/WebPlatformTouchPointIOS.cpp
+++ b/Source/WebKit/Shared/ios/WebPlatformTouchPointIOS.cpp
@@ -26,7 +26,7 @@
 #include "config.h"
 #include "WebTouchEvent.h"
 
-#if ENABLE(TOUCH_EVENTS)
+#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
 
 #include "WebCoreArgumentCoders.h"
 
@@ -79,4 +79,4 @@ Optional<WebPlatformTouchPoint> WebPlatformTouchPoint::decode(IPC::Decoder& deco
 
 } // namespace WebKit
 
-#endif // ENABLE(TOUCH_EVENTS)
+#endif // ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
diff --git a/Source/WebKit/Shared/ios/WebTouchEventIOS.cpp b/Source/WebKit/Shared/ios/WebTouchEventIOS.cpp
index e40a6e172bfd2b75076fd4053da643ebab9eb81f..2516655bbc9e5bc863537a554c5faac0f6fc1a09 100644
--- a/Source/WebKit/Shared/ios/WebTouchEventIOS.cpp
+++ b/Source/WebKit/Shared/ios/WebTouchEventIOS.cpp
@@ -26,7 +26,7 @@
 #include "config.h"
 #include "WebTouchEvent.h"
 
-#if ENABLE(TOUCH_EVENTS)
+#if ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
 
 #include "ArgumentCoders.h"
 #include "WebCoreArgumentCoders.h"
@@ -71,4 +71,4 @@ bool WebTouchEvent::decode(IPC::Decoder& decoder, WebTouchEvent& result)
 
 } // namespace WebKit
 
-#endif // ENABLE(TOUCH_EVENTS)
+#endif // ENABLE(TOUCH_EVENTS) && PLATFORM(IOS_FAMILY)
diff --git a/Source/WebKit/Shared/win/WebEventFactory.cpp b/Source/WebKit/Shared/win/WebEventFactory.cpp
index 88d53d236cd6d62735f03678a04ca9c198dddacb..b8f8efc57ab00dc5725660c5a8ad56a3e6384de5 100644
--- a/Source/WebKit/Shared/win/WebEventFactory.cpp
+++ b/Source/WebKit/Shared/win/WebEventFactory.cpp
@@ -473,7 +473,7 @@ WebKeyboardEvent WebEventFactory::createWebKeyboardEvent(HWND hwnd, UINT message
 }
 
 #if ENABLE(TOUCH_EVENTS)
-WebTouchEvent WebEventFactory::createWebTouchEvent(const GdkEvent* event, Vector<WebPlatformTouchPoint>&& touchPoints)
+WebTouchEvent WebEventFactory::createWebTouchEvent()
 {
     return WebTouchEvent();
 }
diff --git a/Source/WebKit/Sources.txt b/Source/WebKit/Sources.txt
index 0481bcc342cacdcea189b980098f9f5c805c2084..437ed6234592c6c662410a72fdad295d63b7b923 100644
--- a/Source/WebKit/Sources.txt
+++ b/Source/WebKit/Sources.txt
@@ -277,16 +277,20 @@ Shared/WebsiteData/WebsiteData.cpp
 
 UIProcess/AuxiliaryProcessProxy.cpp
 UIProcess/BackgroundProcessResponsivenessTimer.cpp
+UIProcess/BrowserInspectorPipe.cpp
 UIProcess/DeviceIdHashSaltStorage.cpp
 UIProcess/DrawingAreaProxy.cpp
 UIProcess/FrameLoadState.cpp
 UIProcess/GeolocationPermissionRequestManagerProxy.cpp
 UIProcess/GeolocationPermissionRequestProxy.cpp
+UIProcess/InspectorDialogAgent.cpp
+UIProcess/InspectorPlaywrightAgent.cpp
 UIProcess/LegacyGlobalSettings.cpp
 UIProcess/PageLoadState.cpp
 UIProcess/ProcessAssertion.cpp
 UIProcess/ProcessThrottler.cpp
 UIProcess/ProvisionalPageProxy.cpp
+UIProcess/RemoteInspectorPipe.cpp
 UIProcess/ResponsivenessTimer.cpp
 UIProcess/SpeechRecognitionServer.cpp
 UIProcess/SuspendedPageProxy.cpp
@@ -325,6 +329,8 @@ UIProcess/WebOpenPanelResultListenerProxy.cpp
 UIProcess/WebPageDiagnosticLoggingClient.cpp
 UIProcess/WebPageGroup.cpp
 UIProcess/WebPageInjectedBundleClient.cpp
+UIProcess/WebPageInspectorEmulationAgent.cpp
+UIProcess/WebPageInspectorInputAgent.cpp
 UIProcess/WebPageProxy.cpp
 UIProcess/WebPasteboardProxy.cpp
 UIProcess/WebPreferences.cpp
@@ -445,6 +451,9 @@ UIProcess/Inspector/WebPageDebuggable.cpp
 UIProcess/Inspector/WebPageInspectorController.cpp
 
 UIProcess/Inspector/Agents/InspectorBrowserAgent.cpp
+UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp
+UIProcess/Inspector/Agents/ScreencastEncoder.cpp
+UIProcess/Inspector/Agents/WebMFileWriter.cpp
 
 UIProcess/Media/AudioSessionRoutingArbitratorProxy.cpp
 UIProcess/Media/MediaUsageManager.cpp
diff --git a/Source/WebKit/SourcesCocoa.txt b/Source/WebKit/SourcesCocoa.txt
index 5d9b93d17af24beaa020e28529856909bcb6eaf2..ad6f2ab1a44d041c6c2ae03d36547fd6391fedec 100644
--- a/Source/WebKit/SourcesCocoa.txt
+++ b/Source/WebKit/SourcesCocoa.txt
@@ -246,6 +246,7 @@ UIProcess/API/Cocoa/_WKApplicationManifest.mm
 UIProcess/API/Cocoa/_WKAttachment.mm
 UIProcess/API/Cocoa/_WKAutomationSession.mm
 UIProcess/API/Cocoa/_WKAutomationSessionConfiguration.mm
+UIProcess/API/Cocoa/_WKBrowserInspector.mm
 UIProcess/API/Cocoa/_WKContentRuleListAction.mm
 UIProcess/API/Cocoa/_WKContextMenuElementInfo.mm
 UIProcess/API/Cocoa/_WKCustomHeaderFields.mm @no-unify
@@ -412,6 +413,7 @@ UIProcess/Inspector/ios/WKInspectorHighlightView.mm
 UIProcess/Inspector/ios/WKInspectorNodeSearchGestureRecognizer.mm
 
 UIProcess/Inspector/mac/RemoteWebInspectorProxyMac.mm
+UIProcess/Inspector/mac/ScreencastEncoderMac.mm
 UIProcess/Inspector/mac/WebInspectorProxyMac.mm
 UIProcess/Inspector/mac/WKInspectorViewController.mm
 UIProcess/Inspector/mac/WKInspectorWKWebView.mm
diff --git a/Source/WebKit/SourcesGTK.txt b/Source/WebKit/SourcesGTK.txt
index 663c2e39a58564f401765c73ade79b7cf490e62c..20bf355bf41e99ab659a42e24a34011789866de8 100644
--- a/Source/WebKit/SourcesGTK.txt
+++ b/Source/WebKit/SourcesGTK.txt
@@ -124,6 +124,7 @@ UIProcess/API/glib/WebKitAuthenticationRequest.cpp @no-unify
 UIProcess/API/glib/WebKitAutomationSession.cpp @no-unify
 UIProcess/API/glib/WebKitBackForwardList.cpp @no-unify
 UIProcess/API/glib/WebKitBackForwardListItem.cpp @no-unify
+UIProcess/API/glib/WebKitBrowserInspector.cpp @no-unify
 UIProcess/API/glib/WebKitContextMenuClient.cpp @no-unify
 UIProcess/API/glib/WebKitCookieManager.cpp @no-unify
 UIProcess/API/glib/WebKitCredential.cpp @no-unify
@@ -236,6 +237,7 @@ UIProcess/WebsiteData/unix/WebsiteDataStoreUnix.cpp
 
 UIProcess/cairo/BackingStoreCairo.cpp @no-unify
 
+UIProcess/glib/InspectorPlaywrightAgentClientGLib.cpp
 UIProcess/glib/WebProcessPoolGLib.cpp
 UIProcess/glib/WebProcessProxyGLib.cpp
 UIProcess/glib/WebsiteDataStoreGLib.cpp @no-unify
@@ -251,6 +253,7 @@ UIProcess/gtk/ClipboardGtk3.cpp @no-unify
 UIProcess/gtk/ClipboardGtk4.cpp @no-unify
 UIProcess/gtk/GestureController.cpp
 UIProcess/gtk/HardwareAccelerationManager.cpp
+UIProcess/gtk/InspectorTargetProxyGtk.cpp
 UIProcess/gtk/KeyBindingTranslator.cpp
 UIProcess/gtk/PointerLockManager.cpp @no-unify
 UIProcess/gtk/PointerLockManagerWayland.cpp @no-unify
@@ -261,6 +264,8 @@ UIProcess/gtk/WaylandCompositor.cpp @no-unify
 UIProcess/gtk/WebColorPickerGtk.cpp
 UIProcess/gtk/WebContextMenuProxyGtk.cpp
 UIProcess/gtk/WebDataListSuggestionsDropdownGtk.cpp
+UIProcess/gtk/WebPageInspectorEmulationAgentGtk.cpp
+UIProcess/gtk/WebPageInspectorInputAgentGtk.cpp
 UIProcess/gtk/WebPageProxyGtk.cpp @no-unify
 UIProcess/gtk/WebPasteboardProxyGtk.cpp
 UIProcess/gtk/WebPopupMenuProxyGtk.cpp
diff --git a/Source/WebKit/SourcesWPE.txt b/Source/WebKit/SourcesWPE.txt
index 5f35531de116eb5de98f24cdf8cbc66c30e47508..5430009f5a26c02607eb6e9961800b76df1601f6 100644
--- a/Source/WebKit/SourcesWPE.txt
+++ b/Source/WebKit/SourcesWPE.txt
@@ -116,6 +116,7 @@ UIProcess/API/glib/WebKitAuthenticationRequest.cpp @no-unify
 UIProcess/API/glib/WebKitAutomationSession.cpp @no-unify
 UIProcess/API/glib/WebKitBackForwardList.cpp @no-unify
 UIProcess/API/glib/WebKitBackForwardListItem.cpp @no-unify
+UIProcess/API/glib/WebKitBrowserInspector.cpp @no-unify
 UIProcess/API/glib/WebKitContextMenuClient.cpp @no-unify
 UIProcess/API/glib/WebKitCookieManager.cpp @no-unify
 UIProcess/API/glib/WebKitCredential.cpp @no-unify
@@ -194,7 +195,7 @@ UIProcess/Automation/wpe/WebAutomationSessionWPE.cpp
 UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.cpp
 
 UIProcess/geoclue/GeoclueGeolocationProvider.cpp
-
+UIProcess/glib/InspectorPlaywrightAgentClientGLib.cpp
 UIProcess/glib/WebProcessPoolGLib.cpp
 UIProcess/glib/WebProcessProxyGLib.cpp
 UIProcess/glib/WebsiteDataStoreGLib.cpp @no-unify
@@ -216,6 +217,10 @@ UIProcess/linux/MemoryPressureMonitor.cpp
 UIProcess/soup/WebCookieManagerProxySoup.cpp
 UIProcess/soup/WebProcessPoolSoup.cpp
 
+UIProcess/wpe/InspectorTargetProxyWPE.cpp
+UIProcess/wpe/WebPageInspectorEmulationAgentWPE.cpp
+UIProcess/wpe/WebPageInspectorInputAgentWPE.cpp
+
 UIProcess/wpe/WebPageProxyWPE.cpp
 
 WebProcess/GPU/media/gstreamer/VideoLayerRemoteGStreamer.cpp
diff --git a/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.cpp b/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.cpp
index 18585f61bb6ecabec39ff0c03b862c65856dca24..21bab039d1f6116ebf9c59bc42a695a45f4701e8 100644
--- a/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.cpp
+++ b/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.cpp
@@ -53,6 +53,9 @@ Ref<ProcessPoolConfiguration> ProcessPoolConfiguration::copy()
     copy->m_ignoreSynchronousMessagingTimeoutsForTesting = this->m_ignoreSynchronousMessagingTimeoutsForTesting;
     copy->m_attrStyleEnabled = this->m_attrStyleEnabled;
     copy->m_overrideLanguages = this->m_overrideLanguages;
+#if PLATFORM(MAC)
+    copy->m_forceOverlayScrollbars = this->m_forceOverlayScrollbars;
+#endif
     copy->m_alwaysRunsAtBackgroundPriority = this->m_alwaysRunsAtBackgroundPriority;
     copy->m_shouldTakeUIBackgroundAssertion = this->m_shouldTakeUIBackgroundAssertion;
     copy->m_shouldCaptureDisplayInUIProcess = this->m_shouldCaptureDisplayInUIProcess;
diff --git a/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h b/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h
index 64924902f19811792537a15a32ed4d706daf9670..28906745477d89bb0e7c2b9c3f1523d2d76803d6 100644
--- a/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h
+++ b/Source/WebKit/UIProcess/API/APIProcessPoolConfiguration.h
@@ -98,6 +98,11 @@ public:
     const Vector<WTF::String>& overrideLanguages() const { return m_overrideLanguages; }
     void setOverrideLanguages(Vector<WTF::String>&& languages) { m_overrideLanguages = WTFMove(languages); }
     
+#if PLATFORM(MAC)
+    bool forceOverlayScrollbars() const { return m_forceOverlayScrollbars; }
+    void setForceOverlayScrollbars(bool forceOverlayScrollbars) { m_forceOverlayScrollbars = forceOverlayScrollbars; }
+#endif
+
     bool alwaysRunsAtBackgroundPriority() const { return m_alwaysRunsAtBackgroundPriority; }
     void setAlwaysRunsAtBackgroundPriority(bool alwaysRunsAtBackgroundPriority) { m_alwaysRunsAtBackgroundPriority = alwaysRunsAtBackgroundPriority; }
 
@@ -157,6 +162,9 @@ private:
     bool m_ignoreSynchronousMessagingTimeoutsForTesting { false };
     bool m_attrStyleEnabled { false };
     Vector<WTF::String> m_overrideLanguages;
+#if PLATFORM(MAC)
+    bool m_forceOverlayScrollbars { false };
+#endif
     bool m_alwaysRunsAtBackgroundPriority { false };
     bool m_shouldTakeUIBackgroundAssertion { true };
     bool m_shouldCaptureDisplayInUIProcess { DEFAULT_CAPTURE_DISPLAY_IN_UI_PROCESS };
diff --git a/Source/WebKit/UIProcess/API/APIUIClient.h b/Source/WebKit/UIProcess/API/APIUIClient.h
index aa7d89c01e73520ce3ee04226b9ae85970bfaa6e..3de061e6128f07304954af89b601e334ca076929 100644
--- a/Source/WebKit/UIProcess/API/APIUIClient.h
+++ b/Source/WebKit/UIProcess/API/APIUIClient.h
@@ -94,6 +94,7 @@ public:
     virtual void runJavaScriptAlert(WebKit::WebPageProxy&, const WTF::String&, WebKit::WebFrameProxy*, WebKit::FrameInfoData&&, Function<void()>&& completionHandler) { completionHandler(); }
     virtual void runJavaScriptConfirm(WebKit::WebPageProxy&, const WTF::String&, WebKit::WebFrameProxy*, WebKit::FrameInfoData&&, Function<void(bool)>&& completionHandler) { completionHandler(false); }
     virtual void runJavaScriptPrompt(WebKit::WebPageProxy&, const WTF::String&, const WTF::String&, WebKit::WebFrameProxy*, WebKit::FrameInfoData&&, Function<void(const WTF::String&)>&& completionHandler) { completionHandler(WTF::String()); }
+    virtual void handleJavaScriptDialog(WebKit::WebPageProxy&, bool, const WTF::String&) { }
 
     virtual void setStatusText(WebKit::WebPageProxy*, const WTF::String&) { }
     virtual void mouseDidMoveOverElement(WebKit::WebPageProxy&, const WebKit::WebHitTestResultData&, OptionSet<WebKit::WebEvent::Modifier>, Object*) { }
diff --git a/Source/WebKit/UIProcess/API/C/WKInspector.cpp b/Source/WebKit/UIProcess/API/C/WKInspector.cpp
index 39327c5c9230591e4f52e4574c416e36687788f0..450033d87fefb743ab7240ce317fae221f91dcf5 100644
--- a/Source/WebKit/UIProcess/API/C/WKInspector.cpp
+++ b/Source/WebKit/UIProcess/API/C/WKInspector.cpp
@@ -28,6 +28,11 @@
 
 #if !PLATFORM(IOS_FAMILY)
 
+#if PLATFORM(WIN)
+#include "BrowserInspectorPipe.h"
+#include "InspectorPlaywrightAgentClientWin.h"
+#endif
+
 #include "WKAPICast.h"
 #include "WebInspectorProxy.h"
 #include "WebPageProxy.h"
@@ -130,4 +135,11 @@ void WKInspectorToggleElementSelection(WKInspectorRef inspectorRef)
     toImpl(inspectorRef)->toggleElementSelection();
 }
 
+void WKInspectorInitializeRemoteInspectorPipe(ConfigureDataStoreCallback configureDataStore, CreatePageCallback createPage, QuitCallback quit)
+{
+#if PLATFORM(WIN)
+    initializeBrowserInspectorPipe(makeUnique<InspectorPlaywrightAgentClientWin>(configureDataStore, createPage, quit));
+#endif
+}
+
 #endif // !PLATFORM(IOS_FAMILY)
diff --git a/Source/WebKit/UIProcess/API/C/WKInspector.h b/Source/WebKit/UIProcess/API/C/WKInspector.h
index 026121d114c5fcad84c1396be8d692625beaa3bd..edd6e5cae033124c589959a42522fde07a42fdf6 100644
--- a/Source/WebKit/UIProcess/API/C/WKInspector.h
+++ b/Source/WebKit/UIProcess/API/C/WKInspector.h
@@ -66,6 +66,10 @@ WK_EXPORT void WKInspectorTogglePageProfiling(WKInspectorRef inspector);
 WK_EXPORT bool WKInspectorIsElementSelectionActive(WKInspectorRef inspector);
 WK_EXPORT void WKInspectorToggleElementSelection(WKInspectorRef inspector);
 
+typedef void (*ConfigureDataStoreCallback)(WKWebsiteDataStoreRef dataStore);
+typedef WKPageRef (*CreatePageCallback)(WKPageConfigurationRef configuration);
+typedef void (*QuitCallback)();
+WK_EXPORT void WKInspectorInitializeRemoteInspectorPipe(ConfigureDataStoreCallback, CreatePageCallback, QuitCallback);
 #ifdef __cplusplus
 }
 #endif
diff --git a/Source/WebKit/UIProcess/API/C/WKPage.cpp b/Source/WebKit/UIProcess/API/C/WKPage.cpp
index e76e00780a41466205ea29f6120553b6b3a6e449..941696279f56aea87cac548184d8c021775dd8d1 100644
--- a/Source/WebKit/UIProcess/API/C/WKPage.cpp
+++ b/Source/WebKit/UIProcess/API/C/WKPage.cpp
@@ -1692,6 +1692,13 @@ void WKPageSetPageUIClient(WKPageRef pageRef, const WKPageUIClientBase* wkClient
             completionHandler(String());
         }
 
+        void handleJavaScriptDialog(WebPageProxy& page, bool accept, const String& value) final {
+            if (m_client.handleJavaScriptDialog) {
+                m_client.handleJavaScriptDialog(toAPI(&page), accept, toAPI(value.impl()), m_client.base.clientInfo);
+                return;
+            }
+        }
+
         void setStatusText(WebPageProxy* page, const String& text) final
         {
             if (!m_client.setStatusText)
@@ -1752,6 +1759,8 @@ void WKPageSetPageUIClient(WKPageRef pageRef, const WKPageUIClientBase* wkClient
         {
             if (!m_client.didNotHandleKeyEvent)
                 return;
+            if (!event.nativeEvent())
+                return;
             m_client.didNotHandleKeyEvent(toAPI(page), event.nativeEvent(), m_client.base.clientInfo);
         }
 
diff --git a/Source/WebKit/UIProcess/API/C/WKPageUIClient.h b/Source/WebKit/UIProcess/API/C/WKPageUIClient.h
index b6388155cd3036e666110f1925616afd37e868ba..c21275123dc4581f51730a2d27deac37c5d30572 100644
--- a/Source/WebKit/UIProcess/API/C/WKPageUIClient.h
+++ b/Source/WebKit/UIProcess/API/C/WKPageUIClient.h
@@ -90,6 +90,7 @@ typedef void (*WKPageRunBeforeUnloadConfirmPanelCallback)(WKPageRef page, WKStri
 typedef void (*WKPageRunJavaScriptAlertCallback)(WKPageRef page, WKStringRef alertText, WKFrameRef frame, WKSecurityOriginRef securityOrigin, WKPageRunJavaScriptAlertResultListenerRef listener, const void *clientInfo);
 typedef void (*WKPageRunJavaScriptConfirmCallback)(WKPageRef page, WKStringRef message, WKFrameRef frame, WKSecurityOriginRef securityOrigin, WKPageRunJavaScriptConfirmResultListenerRef listener, const void *clientInfo);
 typedef void (*WKPageRunJavaScriptPromptCallback)(WKPageRef page, WKStringRef message, WKStringRef defaultValue, WKFrameRef frame, WKSecurityOriginRef securityOrigin, WKPageRunJavaScriptPromptResultListenerRef listener, const void *clientInfo);
+typedef void (*WKPageHandleJavaScriptDialogCallback)(WKPageRef page, bool accept, WKStringRef value, const void *clientInfo);
 typedef void (*WKPageRequestStorageAccessConfirmCallback)(WKPageRef page, WKFrameRef frame, WKStringRef requestingDomain, WKStringRef currentDomain, WKPageRequestStorageAccessConfirmResultListenerRef listener, const void *clientInfo);
 typedef void (*WKPageTakeFocusCallback)(WKPageRef page, WKFocusDirection direction, const void *clientInfo);
 typedef void (*WKPageFocusCallback)(WKPageRef page, const void *clientInfo);
@@ -1351,6 +1352,7 @@ typedef struct WKPageUIClientV14 {
 
     // Version 14.
     WKPageRunWebAuthenticationPanelCallback                             runWebAuthenticationPanel;
+    WKPageHandleJavaScriptDialogCallback                                handleJavaScriptDialog;
 } WKPageUIClientV14;
 
 #ifdef __cplusplus
diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegate.h b/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegate.h
index cad87f3ef2ab93d93a74cec0c34b47c695de6bc6..66145a384638b97ee08516e56e1e86a83713c634 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegate.h
+++ b/Source/WebKit/UIProcess/API/Cocoa/WKUIDelegate.h
@@ -123,6 +123,13 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable result))completionHandler;
 
+/*! @abstract Handle a JavaScript dialog.
+ @param webView The web view invoking the delegate method.
+ @param accept Whether to accept the dialog.
+ @param value Value to use for prompt dialog.
+ */
+- (void)webView:(WKWebView *)webView handleJavaScriptDialog:(BOOL)accept value:(nullable NSString *)value;
+
 #if TARGET_OS_IPHONE
 
 /*! @abstract Allows your app to determine whether or not the given element should show a preview.
diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.h b/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.h
index 245580d7e15679b82a61c4639850da02d81a4e1e..5fd5c4afbdc167f817b4ae961f446ec44a0ae2c1 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.h
+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.h
@@ -24,7 +24,6 @@
  */
 
 #import <WebKit/WKFoundation.h>
-
 #import <WebKit/WKWebsiteDataRecord.h>
 
 NS_ASSUME_NONNULL_BEGIN
@@ -79,6 +78,8 @@ WK_CLASS_AVAILABLE(macos(10.11), ios(9.0))
 /*! @abstract Returns the cookie store representing HTTP cookies in this website data store. */
 @property (nonatomic, readonly) WKHTTPCookieStore *httpCookieStore WK_API_AVAILABLE(macos(10.13), ios(11.0));
 
+- (uint64_t)sessionID;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm b/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm
index e2e9cbc1ef32a023e1ba846f40777ecedd82bcbb..a18696e7ce50d2151d776133a0e791d480161b2d 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm
+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebsiteDataStore.mm
@@ -44,6 +44,7 @@
 #import <WebCore/Credential.h>
 #import <WebCore/RegistrationDatabase.h>
 #import <WebCore/VersionChecks.h>
+#import <pal/SessionID.h>
 #import <wtf/BlockPtr.h>
 #import <wtf/URL.h>
 #import <wtf/WeakObjCPtr.h>
@@ -198,6 +199,11 @@ static WallTime toSystemClockTime(NSDate *date)
     });
 }
 
+- (uint64_t) sessionID
+{
+    return _websiteDataStore->sessionID().toUInt64();
+}
+
 static Vector<WebKit::WebsiteDataRecord> toWebsiteDataRecords(NSArray *dataRecords)
 {
     Vector<WebKit::WebsiteDataRecord> result;
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKBrowserInspector.h b/Source/WebKit/UIProcess/API/Cocoa/_WKBrowserInspector.h
new file mode 100644
index 0000000000000000000000000000000000000000..5fabe06a3289689246c36dfd96eb9900a48b2b0f
--- /dev/null
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKBrowserInspector.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import <WebKit/WKFoundation.h>
+#import <WebKit/WKProcessPool.h>
+#import <WebKit/WKWebsiteDataStore.h>
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class WKWebView;
+
+WK_CLASS_AVAILABLE(macos(10.14.0))
+@interface _WKBrowserContext : NSObject
+@property (nonatomic, strong) WKWebsiteDataStore *dataStore;
+@property (nonatomic, strong) WKProcessPool *processPool;
+@end
+
+@protocol _WKBrowserInspectorDelegate <NSObject>
+- (WKWebView *)createNewPage:(uint64_t)sessionID;
+- (_WKBrowserContext *)createBrowserContext:(NSString *)proxyServer WithBypassList:(NSString *)proxyBypassList;
+- (void)deleteBrowserContext:(uint64_t)sessionID;
+- (void)quit;
+@end
+
+WK_CLASS_AVAILABLE(macos(10.14.0))
+@interface _WKBrowserInspector : NSObject
++ (void)initializeRemoteInspectorPipe:(id<_WKBrowserInspectorDelegate>)delegate headless:(BOOL)headless;
+@end
+
+
+NS_ASSUME_NONNULL_END
+
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKBrowserInspector.mm b/Source/WebKit/UIProcess/API/Cocoa/_WKBrowserInspector.mm
new file mode 100644
index 0000000000000000000000000000000000000000..e7143513ea2be8e1cdab5c86a28643fffea626dd
--- /dev/null
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKBrowserInspector.mm
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "_WKBrowserInspector.h"
+
+#include "BrowserInspectorPipe.h"
+#include "InspectorPlaywrightAgentClientMac.h"
+#include "PageClientImplMac.h"
+#include "WebKit2Initialize.h"
+
+#import "WKWebView.h"
+
+using namespace WebKit;
+
+@implementation _WKBrowserInspector
+
++ (void)initializeRemoteInspectorPipe:(id<_WKBrowserInspectorDelegate>)delegate headless:(BOOL)headless
+{
+#if ENABLE(REMOTE_INSPECTOR)
+    InitializeWebKit2();
+    PageClientImpl::setHeadless(headless);
+    initializeBrowserInspectorPipe(makeUnique<InspectorPlaywrightAgentClientMac>(delegate));
+#endif
+}
+
+@end
+
+@implementation _WKBrowserContext
+- (void)dealloc
+{
+    [_dataStore release];
+    [_processPool release];
+    _dataStore = nil;
+    _processPool = nil;
+    [super dealloc];
+}
+@end
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.h b/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.h
index 7226cc2cb605d2384b5fdf9210ac731b41610c1e..7883367044356751886f5c1f89250c29fcc58d3a 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.h
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.h
@@ -62,6 +62,7 @@ WK_CLASS_AVAILABLE(macos(10.10), ios(8.0))
 #endif
 @property (nonatomic) pid_t presentingApplicationPID WK_API_AVAILABLE(macos(10.13), ios(11.0));
 @property (nonatomic) BOOL processSwapsOnNavigation WK_API_AVAILABLE(macos(10.14), ios(12.0));
+@property (nonatomic) BOOL forceOverlayScrollbars WK_API_AVAILABLE(macos(10.14));
 @property (nonatomic) BOOL alwaysKeepAndReuseSwappedProcesses WK_API_AVAILABLE(macos(10.14), ios(12.0));
 @property (nonatomic) BOOL processSwapsOnWindowOpenWithOpener WK_API_AVAILABLE(macos(10.14), ios(12.0));
 @property (nonatomic) BOOL prewarmsProcessesAutomatically WK_API_AVAILABLE(macos(10.14.4), ios(12.2));
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.mm b/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.mm
index b4c35e8854c61055655aeff2bfb909cdc542839c..11d685c58d7c148430dd664636f5d51e251800c7 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.mm
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKProcessPoolConfiguration.mm
@@ -231,6 +231,16 @@
     return _processPoolConfiguration->processSwapsOnNavigation();
 }
 
+- (void)setForceOverlayScrollbars:(BOOL)force
+{
+    _processPoolConfiguration->setForceOverlayScrollbars(force);
+}
+
+- (BOOL)forceOverlayScrollbars
+{
+    return _processPoolConfiguration->forceOverlayScrollbars();
+}
+
 - (void)setPrewarmsProcessesAutomatically:(BOOL)prewarms
 {
     _processPoolConfiguration->setIsAutomaticProcessWarmingEnabled(prewarms);
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKRemoteWebInspectorViewController.mm b/Source/WebKit/UIProcess/API/Cocoa/_WKRemoteWebInspectorViewController.mm
index 91bd58f4d1228b8fe4f501d2c8f8a5d0a73ea77e..53474cc5aae42811547404f9c874fea8b28c78a4 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/_WKRemoteWebInspectorViewController.mm
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKRemoteWebInspectorViewController.mm
@@ -25,6 +25,7 @@
 
 #import "config.h"
 #import "_WKRemoteWebInspectorViewControllerPrivate.h"
+#import "WKWebViewPrivate.h"
 
 #if PLATFORM(MAC)
 
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.h b/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.h
index e4cf5a2dc102f596d3aefe8c647b6f5aa9b79b02..ff44bb597a9cc8c6c8742000443e57c221531e53 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.h
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.h
@@ -31,6 +31,7 @@ NS_ASSUME_NONNULL_BEGIN
 @class _WKUserContentWorld;
 @class WKContentWorld;
 @class WKWebView;
+@class WKContentWorld;
 
 typedef NS_ENUM(NSInteger, _WKUserStyleLevel) {
     _WKUserStyleUserLevel,
diff --git a/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.mm b/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.mm
index 7915ea3b2f65da48cf4ea982025a93e4e18a7ffa..158bdf1d097c2d98765e362e1f8e6629f8c20350 100644
--- a/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.mm
+++ b/Source/WebKit/UIProcess/API/Cocoa/_WKUserStyleSheet.mm
@@ -34,6 +34,7 @@
 #import "WebKit2Initialize.h"
 #import "WebPageProxy.h"
 #import "_WKUserContentWorldInternal.h"
+#import <WebKit/WKContentWorldInternal.h>
 #import <wtf/cocoa/VectorCocoa.h>
 
 @implementation _WKUserStyleSheet
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitBrowserInspector.cpp b/Source/WebKit/UIProcess/API/glib/WebKitBrowserInspector.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..54529a23f53cebe6f8a96873ca6c2f31f0481ae0
--- /dev/null
+++ b/Source/WebKit/UIProcess/API/glib/WebKitBrowserInspector.cpp
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebKitBrowserInspector.h"
+
+#include "BrowserInspectorPipe.h"
+#include "InspectorPlaywrightAgentClientGLib.h"
+#include "WebKitBrowserInspectorPrivate.h"
+#include "WebKitWebViewPrivate.h"
+#include <wtf/glib/GRefPtr.h>
+#include <wtf/glib/WTFGType.h>
+
+/**
+ * SECTION: WebKitBrowserInspector
+ * @Short_description: Access to the WebKit browser inspector
+ * @Title: WebKitBrowserInspector
+ *
+ * The WebKit Browser Inspector is an experimental API that provides
+ * access to the inspector via the remote debugging protocol. The protocol
+ * allows to create ephemeral contexts and create pages in them and then
+ * manipulate them using the inspector commands. This may be useful for
+ * the browser automation or remote debugging.
+ *
+ * Currently the protocol can be exposed to the parent process via a unix
+ * pipe.
+ */
+
+enum {
+    CREATE_NEW_PAGE,
+    QUIT_APPLICATION,
+
+    LAST_SIGNAL
+};
+
+struct _WebKitBrowserInspectorPrivate {
+    int unused { 0 };
+};
+
+WEBKIT_DEFINE_TYPE(WebKitBrowserInspector, webkit_browser_inspector, G_TYPE_OBJECT)
+
+static guint signals[LAST_SIGNAL] = { 0, };
+
+static void webkit_browser_inspector_class_init(WebKitBrowserInspectorClass* findClass)
+{
+    GObjectClass* gObjectClass = G_OBJECT_CLASS(findClass);
+
+    /**
+     * WebKitBrowserInspector::create-new-page:
+     * @inspector: the #WebKitBrowserInspector on which the signal is emitted
+     *
+     * Emitted when the inspector is requested to create a new page in the provided
+     * #WebKitWebContext.
+     *
+     * This signal is emitted when inspector receives 'Browser.createPage' command
+     * from its remote client. If the signal is not handled the command will fail.
+     *
+     * Returns: %WebKitWebView that contains created page.
+     */
+    signals[CREATE_NEW_PAGE] = g_signal_new(
+        "create-new-page",
+        G_TYPE_FROM_CLASS(gObjectClass),
+        G_SIGNAL_RUN_LAST,
+        G_STRUCT_OFFSET(WebKitBrowserInspectorClass, create_new_page),
+        nullptr, nullptr,
+        g_cclosure_marshal_generic,
+#if PLATFORM(GTK)
+        GTK_TYPE_WIDGET,
+#else
+        WEBKIT_TYPE_WEB_VIEW,
+#endif
+        1,
+        WEBKIT_TYPE_WEB_CONTEXT);
+
+    /**
+     * WebKitBrowserInspector::quit-application:
+     * @inspector: the #WebKitBrowserInspector on which the signal is emitted
+     *
+     * Emitted when the inspector is requested to close the browser application.
+     *
+     * This signal is emitted when inspector receives 'Browser.close' command
+     * from its remote client. If the signal is not handled the command will fail.
+     */
+    signals[QUIT_APPLICATION] = g_signal_new(
+        "quit-application",
+        G_TYPE_FROM_CLASS(gObjectClass),
+        G_SIGNAL_RUN_LAST,
+        G_STRUCT_OFFSET(WebKitBrowserInspectorClass, quit_application),
+        nullptr, nullptr,
+        g_cclosure_marshal_VOID__VOID,
+        G_TYPE_NONE, 0);
+}
+
+WebKit::WebPageProxy* webkitBrowserInspectorCreateNewPageInContext(WebKitWebContext* context)
+{
+    WebKitWebView* newWebView;
+    g_signal_emit(webkit_browser_inspector_get_default(), signals[CREATE_NEW_PAGE], 0, context, &newWebView);
+    if (!newWebView)
+        return nullptr;
+    return  &webkitWebViewGetPage(newWebView);
+}
+
+void webkitBrowserInspectorQuitApplication()
+{
+    g_signal_emit(webkit_browser_inspector_get_default(), signals[QUIT_APPLICATION], 0, NULL);
+}
+
+static gpointer createWebKitBrowserInspector(gpointer)
+{
+    static GRefPtr<WebKitBrowserInspector> browserInspector = adoptGRef(WEBKIT_BROWSER_INSPECTOR(g_object_new(WEBKIT_TYPE_BROWSER_INSPECTOR, nullptr)));
+    return browserInspector.get();
+}
+
+/**
+ * webkit_browser_inspector_get_default:
+ *
+ * Gets the default instance of the browser inspector.
+ *
+ * Returns: (transfer none): a #WebKitBrowserInspector
+ */
+WebKitBrowserInspector* webkit_browser_inspector_get_default(void)
+{
+    static GOnce onceInit = G_ONCE_INIT;
+    return WEBKIT_BROWSER_INSPECTOR(g_once(&onceInit, createWebKitBrowserInspector, 0));
+}
+
+/**
+ * webkit_browser_inspector_initialize_pipe:
+ *
+ * Creates browser inspector and configures pipe handler to communicate with
+ * the parent process.
+ */
+void webkit_browser_inspector_initialize_pipe(const char* defaultProxyURI, const char* const* ignoreHosts)
+{
+    WebKit::initializeBrowserInspectorPipe(makeUnique<WebKit::InspectorPlaywrightAgentClientGlib>(defaultProxyURI, ignoreHosts));
+}
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitBrowserInspectorPrivate.h b/Source/WebKit/UIProcess/API/glib/WebKitBrowserInspectorPrivate.h
new file mode 100644
index 0000000000000000000000000000000000000000..e0b1da48465c850f541532ed961d1b778bea6028
--- /dev/null
+++ b/Source/WebKit/UIProcess/API/glib/WebKitBrowserInspectorPrivate.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "WebKitBrowserInspector.h"
+#include "WebPageProxy.h"
+
+WebKit::WebPageProxy* webkitBrowserInspectorCreateNewPageInContext(WebKitWebContext*);
+void webkitBrowserInspectorQuitApplication();
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitUIClient.cpp b/Source/WebKit/UIProcess/API/glib/WebKitUIClient.cpp
index 2ceb2b4f49f409bbe6e6810115e36d0c84f83b5d..16d2062b746b80ace6f39d779e9c3b8796b581b1 100644
--- a/Source/WebKit/UIProcess/API/glib/WebKitUIClient.cpp
+++ b/Source/WebKit/UIProcess/API/glib/WebKitUIClient.cpp
@@ -93,6 +93,10 @@ private:
     {
         webkitWebViewRunJavaScriptPrompt(m_webView, message.utf8(), defaultValue.utf8(), WTFMove(completionHandler));
     }
+    void handleJavaScriptDialog(WebPageProxy&, bool accept, const String& value) final
+    {
+        webkitWebViewHandleJavaScriptDialog(m_webView, accept, value);
+    }
 
     bool canRunBeforeUnloadConfirmPanel() const final { return true; }
 
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitWebContext.cpp b/Source/WebKit/UIProcess/API/glib/WebKitWebContext.cpp
index f7faa5880bf02b28157276b60ca100ed38fbf990..aaa967adaa366a72ce5229efb96a01864546a543 100644
--- a/Source/WebKit/UIProcess/API/glib/WebKitWebContext.cpp
+++ b/Source/WebKit/UIProcess/API/glib/WebKitWebContext.cpp
@@ -120,8 +120,8 @@ enum {
     PROP_LOCAL_STORAGE_DIRECTORY,
 #endif
     PROP_WEBSITE_DATA_MANAGER,
-#if PLATFORM(GTK)
     PROP_PSON_ENABLED,
+#if PLATFORM(GTK)
 #if !USE(GTK4)
     PROP_USE_SYSYEM_APPEARANCE_FOR_SCROLLBARS
 #endif
@@ -206,8 +206,8 @@ struct _WebKitWebContextPrivate {
 
     RefPtr<WebProcessPool> processPool;
     bool clientsDetached;
-#if PLATFORM(GTK)
     bool psonEnabled;
+#if PLATFORM(GTK)
 #if !USE(GTK4)
     bool useSystemAppearanceForScrollbars;
 #endif
@@ -306,11 +306,9 @@ WEBKIT_DEFINE_TYPE(WebKitWebContext, webkit_web_context, G_TYPE_OBJECT)
 
 static const char* injectedBundleDirectory()
 {
-#if ENABLE(DEVELOPER_MODE)
     const char* bundleDirectory = g_getenv("WEBKIT_INJECTED_BUNDLE_PATH");
     if (bundleDirectory && g_file_test(bundleDirectory, G_FILE_TEST_IS_DIR))
         return bundleDirectory;
-#endif
 
 #if PLATFORM(GTK)
     static const char* injectedBundlePath = LIBDIR G_DIR_SEPARATOR_S "webkit2gtk-" WEBKITGTK_API_VERSION_STRING
@@ -335,10 +333,10 @@ static void webkitWebContextGetProperty(GObject* object, guint propID, GValue* v
     case PROP_WEBSITE_DATA_MANAGER:
         g_value_set_object(value, webkit_web_context_get_website_data_manager(context));
         break;
-#if PLATFORM(GTK)
     case PROP_PSON_ENABLED:
         g_value_set_boolean(value, context->priv->psonEnabled);
         break;
+#if PLATFORM(GTK)
 #if !USE(GTK4)
     case PROP_USE_SYSYEM_APPEARANCE_FOR_SCROLLBARS:
         g_value_set_boolean(value, webkit_web_context_get_use_system_appearance_for_scrollbars(context));
@@ -365,10 +363,10 @@ static void webkitWebContextSetProperty(GObject* object, guint propID, const GVa
         context->priv->websiteDataManager = manager ? WEBKIT_WEBSITE_DATA_MANAGER(manager) : nullptr;
         break;
     }
-#if PLATFORM(GTK)
     case PROP_PSON_ENABLED:
         context->priv->psonEnabled = g_value_get_boolean(value);
         break;
+#if PLATFORM(GTK)
 #if !USE(GTK4)
     case PROP_USE_SYSYEM_APPEARANCE_FOR_SCROLLBARS:
         webkit_web_context_set_use_system_appearance_for_scrollbars(context, g_value_get_boolean(value));
@@ -380,10 +378,19 @@ static void webkitWebContextSetProperty(GObject* object, guint propID, const GVa
     }
 }
 
+static int webkitWebContext = 0;
+
+int webkitWebContextExistingCount()
+{
+    return webkitWebContext;
+}
+
 static void webkitWebContextConstructed(GObject* object)
 {
     G_OBJECT_CLASS(webkit_web_context_parent_class)->constructed(object);
 
+    ++webkitWebContext;
+
     GUniquePtr<char> bundleFilename(g_build_filename(injectedBundleDirectory(), INJECTED_BUNDLE_FILENAME, nullptr));
 
     WebKitWebContext* webContext = WEBKIT_WEB_CONTEXT(object);
@@ -391,8 +398,8 @@ static void webkitWebContextConstructed(GObject* object)
 
     API::ProcessPoolConfiguration configuration;
     configuration.setInjectedBundlePath(FileSystem::stringFromFileSystemRepresentation(bundleFilename.get()));
-#if PLATFORM(GTK)
     configuration.setProcessSwapsOnNavigation(priv->psonEnabled);
+#if PLATFORM(GTK)
 #if !USE(GTK4)
     configuration.setUseSystemAppearanceForScrollbars(priv->useSystemAppearanceForScrollbars);
 #endif
@@ -429,6 +436,8 @@ static void webkitWebContextConstructed(GObject* object)
 
 static void webkitWebContextDispose(GObject* object)
 {
+    --webkitWebContext;
+
     WebKitWebContextPrivate* priv = WEBKIT_WEB_CONTEXT(object)->priv;
     if (!priv->clientsDetached) {
         priv->clientsDetached = true;
@@ -501,7 +510,6 @@ static void webkit_web_context_class_init(WebKitWebContextClass* webContextClass
             WEBKIT_TYPE_WEBSITE_DATA_MANAGER,
             static_cast<GParamFlags>(WEBKIT_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY)));
 
-#if PLATFORM(GTK)
     /**
      * WebKitWebContext:process-swap-on-cross-site-navigation-enabled:
      *
@@ -525,6 +533,7 @@ static void webkit_web_context_class_init(WebKitWebContextClass* webContextClass
             FALSE,
             static_cast<GParamFlags>(WEBKIT_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY)));
 
+#if PLATFORM(GTK)
 #if !USE(GTK4)
     /**
      * WebKitWebContext:use-system-appearance-for-scrollbars:
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitWebContextPrivate.h b/Source/WebKit/UIProcess/API/glib/WebKitWebContextPrivate.h
index 78d1578f94793e9e59a3d4d2b33e79ea8530fa04..493cdadac3873508b3efa3048638e73a13f4c976 100644
--- a/Source/WebKit/UIProcess/API/glib/WebKitWebContextPrivate.h
+++ b/Source/WebKit/UIProcess/API/glib/WebKitWebContextPrivate.h
@@ -45,3 +45,4 @@ void webkitWebContextInitializeNotificationPermissions(WebKitWebContext*);
 #if ENABLE(REMOTE_INSPECTOR)
 void webkitWebContextWillCloseAutomationSession(WebKitWebContext*);
 #endif
+int webkitWebContextExistingCount();
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp b/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp
index b3c7c0827747fed78dd9e355ad02d089ce059a1b..07183d2c8009ab6bf07d826c876a2c2ffeb7e94e 100644
--- a/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp
+++ b/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp
@@ -31,6 +31,7 @@
 #include "WebCertificateInfo.h"
 #include "WebContextMenuItem.h"
 #include "WebContextMenuItemData.h"
+#include "WebPageInspectorController.h"
 #include "WebKitAuthenticationRequestPrivate.h"
 #include "WebKitBackForwardListPrivate.h"
 #include "WebKitContextMenuClient.h"
@@ -132,6 +133,7 @@ enum {
     CLOSE,
 
     SCRIPT_DIALOG,
+    SCRIPT_DIALOG_HANDLED,
 
     DECIDE_POLICY,
     PERMISSION_REQUEST,
@@ -435,6 +437,9 @@ void WebKitWebViewClient::handleDownloadRequest(WKWPE::View&, DownloadProxy& dow
 
 void WebKitWebViewClient::frameDisplayed(WKWPE::View&)
 {
+    if (RefPtr<cairo_surface_t> surface = adoptRef(webkitWebViewBackendTakeScreenshot(m_webView->priv->backend.get())))
+        getPage(m_webView).inspectorController().didPaint(surface.get());
+
     {
         SetForScope<bool> inFrameDisplayedGuard(m_webView->priv->inFrameDisplayed, true);
         for (const auto& callback : m_webView->priv->frameDisplayedCallbacks) {
@@ -465,6 +470,7 @@ void WebKitWebViewClient::didReceiveUserMessage(WKWPE::View&, UserMessage&& mess
 {
     webkitWebViewDidReceiveUserMessage(m_webView, WTFMove(message), WTFMove(completionHandler));
 }
+
 #endif
 
 static gboolean webkitWebViewLoadFail(WebKitWebView* webView, WebKitLoadEvent, const char* failingURI, GError* error)
@@ -1593,6 +1599,15 @@ static void webkit_web_view_class_init(WebKitWebViewClass* webViewClass)
         G_TYPE_BOOLEAN, 1,
         WEBKIT_TYPE_SCRIPT_DIALOG);
 
+    signals[SCRIPT_DIALOG_HANDLED] = g_signal_new(
+        "script-dialog-handled",
+        G_TYPE_FROM_CLASS(webViewClass),
+        G_SIGNAL_RUN_LAST,
+        G_STRUCT_OFFSET(WebKitWebViewClass, script_dialog),
+        g_signal_accumulator_true_handled, nullptr,
+        g_cclosure_marshal_generic,
+        G_TYPE_BOOLEAN, 1);
+
     /**
      * WebKitWebView::decide-policy:
      * @web_view: the #WebKitWebView on which the signal is emitted
@@ -2486,6 +2501,23 @@ void webkitWebViewRunJavaScriptBeforeUnloadConfirm(WebKitWebView* webView, const
     webkit_script_dialog_unref(webView->priv->currentScriptDialog);
 }
 
+void webkitWebViewHandleJavaScriptDialog(WebKitWebView* webView, bool accept, const String& value) {
+    auto* dialog = webView->priv->currentScriptDialog;
+#if PLATFORM(WPE)
+    dialog->isUserHandled = false;
+#endif
+    webkit_script_dialog_ref(dialog);
+    if (!value.isNull())
+        webkitWebViewSetCurrentScriptDialogUserInput(webView, value);
+    if (accept)
+        webkitWebViewAcceptCurrentScriptDialog(webView);
+    else
+        webkitWebViewDismissCurrentScriptDialog(webView);
+    gboolean returnValue;
+    g_signal_emit(webView, signals[SCRIPT_DIALOG_HANDLED], 0, dialog, &returnValue);
+    webkit_script_dialog_unref(dialog);
+}
+
 bool webkitWebViewIsShowingScriptDialog(WebKitWebView* webView)
 {
     if (!webView->priv->currentScriptDialog)
diff --git a/Source/WebKit/UIProcess/API/glib/WebKitWebViewPrivate.h b/Source/WebKit/UIProcess/API/glib/WebKitWebViewPrivate.h
index b9e56fc55fd7dfa821f789264b0c15f9b4c7b412..4138d5b42077f735264ac7a168cce329ebaa89c3 100644
--- a/Source/WebKit/UIProcess/API/glib/WebKitWebViewPrivate.h
+++ b/Source/WebKit/UIProcess/API/glib/WebKitWebViewPrivate.h
@@ -60,6 +60,7 @@ void webkitWebViewRunJavaScriptAlert(WebKitWebView*, const CString& message, Fun
 void webkitWebViewRunJavaScriptConfirm(WebKitWebView*, const CString& message, Function<void(bool)>&& completionHandler);
 void webkitWebViewRunJavaScriptPrompt(WebKitWebView*, const CString& message, const CString& defaultText, Function<void(const String&)>&& completionHandler);
 void webkitWebViewRunJavaScriptBeforeUnloadConfirm(WebKitWebView*, const CString& message, Function<void(bool)>&& completionHandler);
+void webkitWebViewHandleJavaScriptDialog(WebKitWebView*, bool accept, const String& value);
 bool webkitWebViewIsShowingScriptDialog(WebKitWebView*);
 bool webkitWebViewIsScriptDialogRunning(WebKitWebView*, WebKitScriptDialog*);
 String webkitWebViewGetCurrentScriptDialogMessage(WebKitWebView*);
diff --git a/Source/WebKit/UIProcess/API/gtk/PageClientImpl.cpp b/Source/WebKit/UIProcess/API/gtk/PageClientImpl.cpp
index 57139e2d910cf1834d071d482b3967194dd0fda1..3b6ecd1ace15fdaded93b9207446f2810aaf7dbd 100644
--- a/Source/WebKit/UIProcess/API/gtk/PageClientImpl.cpp
+++ b/Source/WebKit/UIProcess/API/gtk/PageClientImpl.cpp
@@ -241,6 +241,8 @@ void PageClientImpl::doneWithKeyEvent(const NativeWebKeyboardEvent& event, bool
 {
     if (wasEventHandled || event.type() != WebEvent::Type::KeyDown || !event.nativeEvent())
         return;
+    if (!event.nativeEvent())
+        return;
 
     WebKitWebViewBase* webkitWebViewBase = WEBKIT_WEB_VIEW_BASE(m_viewWidget);
     webkitWebViewBaseForwardNextKeyEvent(webkitWebViewBase);
diff --git a/Source/WebKit/UIProcess/API/gtk/WebKitBrowserInspector.h b/Source/WebKit/UIProcess/API/gtk/WebKitBrowserInspector.h
new file mode 100644
index 0000000000000000000000000000000000000000..9f1a0173a5641d6f158d815b8f7b9ea66f65c26d
--- /dev/null
+++ b/Source/WebKit/UIProcess/API/gtk/WebKitBrowserInspector.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if !defined(__WEBKIT2_H_INSIDE__) && !defined(WEBKIT2_COMPILATION)
+#error "Only <webkit2/webkit2.h> can be included directly."
+#endif
+
+#ifndef WebKitBrowserInspector_h
+#define WebKitBrowserInspector_h
+
+#include <glib-object.h>
+#include <webkit2/WebKitDefines.h>
+#include <webkit2/WebKitWebView.h>
+
+G_BEGIN_DECLS
+
+#define WEBKIT_TYPE_BROWSER_INSPECTOR            (webkit_browser_inspector_get_type())
+#define WEBKIT_BROWSER_INSPECTOR(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), WEBKIT_TYPE_BROWSER_INSPECTOR, WebKitBrowserInspector))
+#define WEBKIT_IS_BROWSER_INSPECTOR(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), WEBKIT_TYPE_BROWSER_INSPECTOR))
+#define WEBKIT_BROWSER_INSPECTOR_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass),  WEBKIT_TYPE_BROWSER_INSPECTOR, WebKitBrowserInspectorClass))
+#define WEBKIT_IS_BROWSER_INSPECTOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),  WEBKIT_TYPE_BROWSER_INSPECTOR))
+#define WEBKIT_BROWSER_INSPECTOR_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj),  WEBKIT_TYPE_BROWSER_INSPECTOR, WebKitBrowserInspectorClass))
+
+typedef struct _WebKitBrowserInspector        WebKitBrowserInspector;
+typedef struct _WebKitBrowserInspectorClass   WebKitBrowserInspectorClass;
+typedef struct _WebKitBrowserInspectorPrivate WebKitBrowserInspectorPrivate;
+
+struct _WebKitBrowserInspector {
+    GObject parent;
+
+    WebKitBrowserInspectorPrivate *priv;
+};
+
+struct _WebKitBrowserInspectorClass {
+    GObjectClass parent_class;
+
+    WebKitWebView *(* create_new_page)           (WebKitBrowserInspector    *browser_inspector,
+                                                  WebKitWebContext          *context);
+    WebKitWebView *(* quit_application)          (WebKitBrowserInspector    *browser_inspector);
+
+    void (*_webkit_reserved0) (void);
+    void (*_webkit_reserved1) (void);
+    void (*_webkit_reserved2) (void);
+    void (*_webkit_reserved3) (void);
+};
+
+WEBKIT_API GType
+webkit_browser_inspector_get_type                     (void);
+
+WEBKIT_API WebKitBrowserInspector *
+webkit_browser_inspector_get_default                  (void);
+
+WEBKIT_API void
+webkit_browser_inspector_initialize_pipe              (const char* defaultProxyURI,
+                                                       const char* const* ignoreHosts);
+
+G_END_DECLS
+
+#endif
diff --git a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp
index f4c7c7a40351e8d1df8ddb615b12cda6e228592c..13fa06163ba552c584a40aec7669689ba48584b9 100644
--- a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp
+++ b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp
@@ -2266,6 +2266,11 @@ void webkitWebViewBaseResetClickCounter(WebKitWebViewBase* webkitWebViewBase)
 #endif
 }
 
+WebKit::AcceleratedBackingStore* webkitWebViewBaseGetAcceleratedBackingStore(WebKitWebViewBase* webkitWebViewBase)
+{
+    return webkitWebViewBase->priv->acceleratedBackingStore.get();
+}
+
 void webkitWebViewBaseEnterAcceleratedCompositingMode(WebKitWebViewBase* webkitWebViewBase, const LayerTreeContext& layerTreeContext)
 {
     ASSERT(webkitWebViewBase->priv->acceleratedBackingStore);
diff --git a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBasePrivate.h b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBasePrivate.h
index d09aea45d94fb7367ba88fdf8326dea1209d02ce..dac8f3ec62ace87fc82c997feb950733aa59a996 100644
--- a/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBasePrivate.h
+++ b/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBasePrivate.h
@@ -27,6 +27,7 @@
 
 #pragma once
 
+#include "AcceleratedBackingStore.h"
 #include "APIPageConfiguration.h"
 #include "GestureController.h"
 #include "InputMethodState.h"
@@ -120,3 +121,5 @@ void webkitWebViewBaseDidLosePointerLock(WebKitWebViewBase*);
 void webkitWebViewBaseSetInputMethodContext(WebKitWebViewBase*, WebKitInputMethodContext*);
 WebKitInputMethodContext* webkitWebViewBaseGetInputMethodContext(WebKitWebViewBase*);
 void webkitWebViewBaseSynthesizeCompositionKeyPress(WebKitWebViewBase*, const String& text, Optional<Vector<WebCore::CompositionUnderline>>&&, Optional<WebKit::EditingRange>&&);
+
+WebKit::AcceleratedBackingStore* webkitWebViewBaseGetAcceleratedBackingStore(WebKitWebViewBase*);
diff --git a/Source/WebKit/UIProcess/API/gtk/webkit2.h b/Source/WebKit/UIProcess/API/gtk/webkit2.h
index c358118360a38c7b462227aa4ab8388bd7942c3e..70bdfbda231b481e8c5ac34fe6d8825f2350d71e 100644
--- a/Source/WebKit/UIProcess/API/gtk/webkit2.h
+++ b/Source/WebKit/UIProcess/API/gtk/webkit2.h
@@ -32,6 +32,7 @@
 #include <webkit2/WebKitAutomationSession.h>
 #include <webkit2/WebKitBackForwardList.h>
 #include <webkit2/WebKitBackForwardListItem.h>
+#include <webkit2/WebKitBrowserInspector.h>
 #include <webkit2/WebKitContextMenu.h>
 #include <webkit2/WebKitContextMenuActions.h>
 #include <webkit2/WebKitContextMenuItem.h>
diff --git a/Source/WebKit/UIProcess/API/wpe/PageClientImpl.cpp b/Source/WebKit/UIProcess/API/wpe/PageClientImpl.cpp
index 2e758227c7274e8a1297c35bfea7ffc2861f6759..160fbce41d7fb868fc8acaab815e7b80593865e6 100644
--- a/Source/WebKit/UIProcess/API/wpe/PageClientImpl.cpp
+++ b/Source/WebKit/UIProcess/API/wpe/PageClientImpl.cpp
@@ -194,7 +194,7 @@ WebCore::IntPoint PageClientImpl::accessibilityScreenToRootView(const WebCore::I
 
 WebCore::IntRect PageClientImpl::rootViewToAccessibilityScreen(const WebCore::IntRect& rect)
 {
-    return rootViewToScreen(rect);    
+    return rootViewToScreen(rect);
 }
 
 void PageClientImpl::doneWithKeyEvent(const NativeWebKeyboardEvent&, bool)
diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitBrowserInspector.h b/Source/WebKit/UIProcess/API/wpe/WebKitBrowserInspector.h
new file mode 100644
index 0000000000000000000000000000000000000000..cb1a540d341b07581ec87b922b7d007ce45ba989
--- /dev/null
+++ b/Source/WebKit/UIProcess/API/wpe/WebKitBrowserInspector.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if !defined(__WEBKIT_H_INSIDE__) && !defined(WEBKIT2_COMPILATION)
+#error "Only <wpe/webkit.h> can be included directly."
+#endif
+
+#ifndef WebKitBrowserInspector_h
+#define WebKitBrowserInspector_h
+
+#include <glib-object.h>
+#include <wpe/WebKitDefines.h>
+#include <wpe/WebKitWebView.h>
+
+G_BEGIN_DECLS
+
+#define WEBKIT_TYPE_BROWSER_INSPECTOR            (webkit_browser_inspector_get_type())
+#define WEBKIT_BROWSER_INSPECTOR(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), WEBKIT_TYPE_BROWSER_INSPECTOR, WebKitBrowserInspector))
+#define WEBKIT_IS_BROWSER_INSPECTOR(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), WEBKIT_TYPE_BROWSER_INSPECTOR))
+#define WEBKIT_BROWSER_INSPECTOR_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass),  WEBKIT_TYPE_BROWSER_INSPECTOR, WebKitBrowserInspectorClass))
+#define WEBKIT_IS_BROWSER_INSPECTOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),  WEBKIT_TYPE_BROWSER_INSPECTOR))
+#define WEBKIT_BROWSER_INSPECTOR_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj),  WEBKIT_TYPE_BROWSER_INSPECTOR, WebKitBrowserInspectorClass))
+
+typedef struct _WebKitBrowserInspector        WebKitBrowserInspector;
+typedef struct _WebKitBrowserInspectorClass   WebKitBrowserInspectorClass;
+typedef struct _WebKitBrowserInspectorPrivate WebKitBrowserInspectorPrivate;
+
+struct _WebKitBrowserInspector {
+    GObject parent;
+
+    WebKitBrowserInspectorPrivate *priv;
+};
+
+struct _WebKitBrowserInspectorClass {
+    GObjectClass parent_class;
+
+    WebKitWebView *(* create_new_page)           (WebKitBrowserInspector    *browser_inspector,
+                                                  WebKitWebContext          *context);
+    WebKitWebView *(* quit_application)          (WebKitBrowserInspector    *browser_inspector);
+
+    void (*_webkit_reserved0) (void);
+    void (*_webkit_reserved1) (void);
+    void (*_webkit_reserved2) (void);
+    void (*_webkit_reserved3) (void);
+};
+
+WEBKIT_API GType
+webkit_browser_inspector_get_type                     (void);
+
+WEBKIT_API WebKitBrowserInspector *
+webkit_browser_inspector_get_default                  (void);
+
+WEBKIT_API void
+webkit_browser_inspector_initialize_pipe              (const char* defaultProxyURI,
+                                                       const char* const* ignoreHosts);
+
+G_END_DECLS
+
+#endif
diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.cpp b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.cpp
index e0fc205b39095cf8aae201a1dcca520461c60de4..872186ad99a7b82f0c61705ff6c5ae4453e5e1d4 100644
--- a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.cpp
+++ b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.cpp
@@ -54,6 +54,7 @@ struct _WebKitWebViewBackend {
     struct wpe_view_backend* backend;
     GDestroyNotify notifyCallback;
     gpointer notifyCallbackData;
+    take_screenshot_callback screenshotCallback;
     int referenceCount { 1 };
 };
 
@@ -116,6 +117,19 @@ struct wpe_view_backend* webkit_web_view_backend_get_wpe_backend(WebKitWebViewBa
     return viewBackend->backend;
 }
 
+void webkit_web_view_backend_set_screenshot_callback(WebKitWebViewBackend *view_backend, take_screenshot_callback callback)
+{
+    view_backend->screenshotCallback = callback;
+}
+
+cairo_surface_t* webkitWebViewBackendTakeScreenshot(WebKitWebViewBackend* view_backend)
+{
+    if (!view_backend->screenshotCallback)
+        return nullptr;
+
+    return view_backend->screenshotCallback(view_backend->notifyCallbackData);
+}
+
 namespace WTF {
 
 template <> WebKitWebViewBackend* refGPtr(WebKitWebViewBackend* ptr)
diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.h b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.h
index 6663964d5abac79e123d90e0351590884c66aa72..13ba5e7c3895c6e4efda95f1f90b9baea1c1bf30 100644
--- a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.h
+++ b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackend.h
@@ -27,6 +27,7 @@
 #include <glib-object.h>
 #include <wpe/WebKitDefines.h>
 #include <wpe/wpe.h>
+#include <cairo.h>
 
 G_BEGIN_DECLS
 
@@ -44,6 +45,12 @@ webkit_web_view_backend_new             (struct wpe_view_backend *backend,
 WEBKIT_API struct wpe_view_backend *
 webkit_web_view_backend_get_wpe_backend (WebKitWebViewBackend    *view_backend);
 
+typedef cairo_surface_t* (*take_screenshot_callback)(gpointer              user_data);
+
+WEBKIT_API void
+webkit_web_view_backend_set_screenshot_callback   (WebKitWebViewBackend      *view_backend,
+                                                   take_screenshot_callback  callback);
+
 G_END_DECLS
 
 #endif /* WebKitWebViewBackend_h */
diff --git a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackendPrivate.h b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackendPrivate.h
index e4b92ace1531090ae38a7aec3d3d4febf19aee84..43690f9ef4969a39084501613bfc00a77fd5df49 100644
--- a/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackendPrivate.h
+++ b/Source/WebKit/UIProcess/API/wpe/WebKitWebViewBackendPrivate.h
@@ -31,3 +31,5 @@ template <> void derefGPtr(WebKitWebViewBackend* ptr);
 }
 
 void webkitWebViewBackendUnref(WebKitWebViewBackend*);
+
+cairo_surface_t* webkitWebViewBackendTakeScreenshot(WebKitWebViewBackend*);
diff --git a/Source/WebKit/UIProcess/API/wpe/docs/wpe-1.0-sections.txt b/Source/WebKit/UIProcess/API/wpe/docs/wpe-1.0-sections.txt
index 0ee250e56338cda7332d70508582a59a7ad21c80..c875e31ed4476d1f5923572d07d02ec85a93184d 100644
--- a/Source/WebKit/UIProcess/API/wpe/docs/wpe-1.0-sections.txt
+++ b/Source/WebKit/UIProcess/API/wpe/docs/wpe-1.0-sections.txt
@@ -317,6 +317,8 @@ WEBKIT_TYPE_WEB_VIEW_BACKEND
 WebKitWebViewBackend
 webkit_web_view_backend_get_wpe_backend
 webkit_web_view_backend_new
+take_screenshot_callback
+webkit_web_view_backend_set_screenshot_callback
 
 <SUBSECTION Private>
 webkit_web_view_backend_get_type
diff --git a/Source/WebKit/UIProcess/API/wpe/webkit.h b/Source/WebKit/UIProcess/API/wpe/webkit.h
index 27c680d46428d349b0d1119f12da56ff283a60aa..1980aff7d662a1eea450d2db78b41f12a04f715e 100644
--- a/Source/WebKit/UIProcess/API/wpe/webkit.h
+++ b/Source/WebKit/UIProcess/API/wpe/webkit.h
@@ -32,6 +32,7 @@
 #include <wpe/WebKitAutomationSession.h>
 #include <wpe/WebKitBackForwardList.h>
 #include <wpe/WebKitBackForwardListItem.h>
+#include <wpe/WebKitBrowserInspector.h>
 #include <wpe/WebKitContextMenu.h>
 #include <wpe/WebKitContextMenuActions.h>
 #include <wpe/WebKitContextMenuItem.h>
diff --git a/Source/WebKit/UIProcess/BackingStore.h b/Source/WebKit/UIProcess/BackingStore.h
index fe3c63e61f778762dc2c2080c74ec53fdf8c2e5f..c43a8226c9be702e248f1712e465efa396ee8969 100644
--- a/Source/WebKit/UIProcess/BackingStore.h
+++ b/Source/WebKit/UIProcess/BackingStore.h
@@ -60,6 +60,7 @@ public:
 
 #if USE(CAIRO)
     typedef cairo_t* PlatformGraphicsContext;
+    cairo_surface_t* surface() const;
 #elif USE(DIRECT2D)
     struct DXConnections {
         ID3D11DeviceContext1* immediateContext { nullptr };
diff --git a/Source/WebKit/UIProcess/BrowserInspectorPipe.cpp b/Source/WebKit/UIProcess/BrowserInspectorPipe.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..dc8af6fe1c57bcd62d605fd1daa3da13361858bb
--- /dev/null
+++ b/Source/WebKit/UIProcess/BrowserInspectorPipe.cpp
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "BrowserInspectorPipe.h"
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorPlaywrightAgent.h"
+#include "RemoteInspectorPipe.h"
+#include <wtf/NeverDestroyed.h>
+#include "InspectorPlaywrightAgentClient.h"
+
+namespace WebKit {
+
+void initializeBrowserInspectorPipe(std::unique_ptr<InspectorPlaywrightAgentClient> client)
+{
+    class BrowserInspectorPipe {
+    public:
+        BrowserInspectorPipe(std::unique_ptr<InspectorPlaywrightAgentClient> client)
+            : m_playwrightAgent(std::move(client))
+            , m_remoteInspectorPipe(m_playwrightAgent)
+        {
+        }
+
+        InspectorPlaywrightAgent m_playwrightAgent;
+        RemoteInspectorPipe m_remoteInspectorPipe;
+    };
+
+    static NeverDestroyed<BrowserInspectorPipe> pipe(std::move(client));
+}
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/BrowserInspectorPipe.h b/Source/WebKit/UIProcess/BrowserInspectorPipe.h
new file mode 100644
index 0000000000000000000000000000000000000000..cd66887de171cda7d15a8e4dc6dbff63665dc619
--- /dev/null
+++ b/Source/WebKit/UIProcess/BrowserInspectorPipe.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+namespace WebKit {
+
+class InspectorPlaywrightAgentClient;
+
+void initializeBrowserInspectorPipe(std::unique_ptr<InspectorPlaywrightAgentClient> client);
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.h b/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.h
index 454c61ffdefecc476d1560c7c43f5b5d345f281d..6de7509037b7683ddd403ee247bdf2845ce4e87a 100644
--- a/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.h
+++ b/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.h
@@ -27,6 +27,8 @@
 
 #if HAVE(APP_SSO)
 
+#include <wtf/Forward.h>
+#include <wtf/CompletionHandler.h>
 #include "SOAuthorizationSession.h"
 #include <wtf/CompletionHandler.h>
 
@@ -39,6 +41,8 @@ class NavigationAction;
 
 namespace WebKit {
 
+class WebPageProxy;
+
 // FSM: Idle => Active => Completed
 class PopUpSOAuthorizationSession final : public SOAuthorizationSession {
 public:
diff --git a/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.mm b/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.mm
index 0f18038de989e69a8432c85b71b6c04e931302b3..82a966779403346aed174dcfcd01a79691956d7b 100644
--- a/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.mm
+++ b/Source/WebKit/UIProcess/Cocoa/SOAuthorization/PopUpSOAuthorizationSession.mm
@@ -29,6 +29,7 @@
 #if HAVE(APP_SSO)
 
 #import "APINavigationAction.h"
+#import "WebPageProxy.h"
 #import "WKNavigationDelegatePrivate.h"
 #import "WKUIDelegate.h"
 #import "WKWebViewConfigurationPrivate.h"
diff --git a/Source/WebKit/UIProcess/Cocoa/UIDelegate.h b/Source/WebKit/UIProcess/Cocoa/UIDelegate.h
index 8a094745c1f24be105dbb02ab91e307b31d486b1..95d3fee2eefac113def2eace3cd40a6f06fa74d3 100644
--- a/Source/WebKit/UIProcess/Cocoa/UIDelegate.h
+++ b/Source/WebKit/UIProcess/Cocoa/UIDelegate.h
@@ -91,6 +91,7 @@ private:
         void runJavaScriptAlert(WebPageProxy&, const WTF::String&, WebFrameProxy*, FrameInfoData&&, Function<void()>&& completionHandler) final;
         void runJavaScriptConfirm(WebPageProxy&, const WTF::String&, WebFrameProxy*, FrameInfoData&&, Function<void(bool)>&& completionHandler) final;
         void runJavaScriptPrompt(WebPageProxy&, const WTF::String&, const WTF::String&, WebFrameProxy*, FrameInfoData&&, Function<void(const WTF::String&)>&&) final;
+        void handleJavaScriptDialog(WebKit::WebPageProxy&, bool accept, const WTF::String&) final;
         void presentStorageAccessConfirmDialog(const WTF::String& requestingDomain, const WTF::String& currentDomain, CompletionHandler<void(bool)>&&);
         void requestStorageAccessConfirm(WebPageProxy&, WebFrameProxy*, const WebCore::RegistrableDomain& requestingDomain, const WebCore::RegistrableDomain& currentDomain, CompletionHandler<void(bool)>&&) final;
         void decidePolicyForGeolocationPermissionRequest(WebPageProxy&, WebFrameProxy&, const FrameInfoData&, Function<void(bool)>&) final;
@@ -174,6 +175,7 @@ private:
         bool webViewRunJavaScriptAlertPanelWithMessageInitiatedByFrameCompletionHandler : 1;
         bool webViewRunJavaScriptConfirmPanelWithMessageInitiatedByFrameCompletionHandler : 1;
         bool webViewRunJavaScriptTextInputPanelWithPromptDefaultTextInitiatedByFrameCompletionHandler : 1;
+        bool webViewHandleJavaScriptDialogValue : 1;
         bool webViewRequestStorageAccessPanelUnderFirstPartyCompletionHandler : 1;
         bool webViewRunBeforeUnloadConfirmPanelWithMessageInitiatedByFrameCompletionHandler : 1;
         bool webViewRequestGeolocationPermissionForFrameDecisionHandler : 1;
diff --git a/Source/WebKit/UIProcess/Cocoa/UIDelegate.mm b/Source/WebKit/UIProcess/Cocoa/UIDelegate.mm
index d0338f8d6e3b9a13df2af153acb5deb38e1fcd9b..12f2d19b10de8ac14eb078f8ec6c67cf861985cc 100644
--- a/Source/WebKit/UIProcess/Cocoa/UIDelegate.mm
+++ b/Source/WebKit/UIProcess/Cocoa/UIDelegate.mm
@@ -104,6 +104,7 @@ void UIDelegate::setDelegate(id <WKUIDelegate> delegate)
     m_delegateMethods.webViewRunJavaScriptAlertPanelWithMessageInitiatedByFrameCompletionHandler = [delegate respondsToSelector:@selector(webView:runJavaScriptAlertPanelWithMessage:initiatedByFrame:completionHandler:)];
     m_delegateMethods.webViewRunJavaScriptConfirmPanelWithMessageInitiatedByFrameCompletionHandler = [delegate respondsToSelector:@selector(webView:runJavaScriptConfirmPanelWithMessage:initiatedByFrame:completionHandler:)];
     m_delegateMethods.webViewRunJavaScriptTextInputPanelWithPromptDefaultTextInitiatedByFrameCompletionHandler = [delegate respondsToSelector:@selector(webView:runJavaScriptTextInputPanelWithPrompt:defaultText:initiatedByFrame:completionHandler:)];
+    m_delegateMethods.webViewHandleJavaScriptDialogValue = [delegate respondsToSelector:@selector(webView:handleJavaScriptDialog:value:)];
     m_delegateMethods.webViewRequestStorageAccessPanelUnderFirstPartyCompletionHandler = [delegate respondsToSelector:@selector(_webView:requestStorageAccessPanelForDomain:underCurrentDomain:completionHandler:)];
     m_delegateMethods.webViewRunBeforeUnloadConfirmPanelWithMessageInitiatedByFrameCompletionHandler = [delegate respondsToSelector:@selector(_webView:runBeforeUnloadConfirmPanelWithMessage:initiatedByFrame:completionHandler:)];
     m_delegateMethods.webViewRequestGeolocationPermissionForFrameDecisionHandler = [delegate respondsToSelector:@selector(_webView:requestGeolocationPermissionForFrame:decisionHandler:)];
@@ -345,6 +346,15 @@ void UIDelegate::UIClient::runJavaScriptPrompt(WebPageProxy& page, const WTF::St
     }).get()];
 }
 
+void UIDelegate::UIClient::handleJavaScriptDialog(WebKit::WebPageProxy&, bool accept, const WTF::String& value) {
+    if (!m_uiDelegate.m_delegateMethods.webViewHandleJavaScriptDialogValue)
+        return;
+    auto delegate = m_uiDelegate.m_delegate.get();
+    if (!delegate)
+        return;
+    [delegate webView:m_uiDelegate.m_webView handleJavaScriptDialog:accept value:value];
+}
+
 void UIDelegate::UIClient::requestStorageAccessConfirm(WebPageProxy&, WebFrameProxy*, const WebCore::RegistrableDomain& requestingDomain, const WebCore::RegistrableDomain& currentDomain, CompletionHandler<void(bool)>&& completionHandler)
 {
     auto delegate = m_uiDelegate.m_delegate.get();
diff --git a/Source/WebKit/UIProcess/Cocoa/WebProcessPoolCocoa.mm b/Source/WebKit/UIProcess/Cocoa/WebProcessPoolCocoa.mm
index a766ec5f97c45c90f16e77d3da05f1a0af098ea0..327de55ce0ad36777094ecf09247174fdae2306e 100644
--- a/Source/WebKit/UIProcess/Cocoa/WebProcessPoolCocoa.mm
+++ b/Source/WebKit/UIProcess/Cocoa/WebProcessPoolCocoa.mm
@@ -382,7 +382,7 @@ void WebProcessPool::platformInitializeWebProcess(const WebProcessProxy& process
     auto screenProperties = WebCore::collectScreenProperties();
     parameters.screenProperties = WTFMove(screenProperties);
 #if PLATFORM(MAC)
-    parameters.useOverlayScrollbars = ([NSScroller preferredScrollerStyle] == NSScrollerStyleOverlay);
+    parameters.useOverlayScrollbars = m_configuration->forceOverlayScrollbars() || ([NSScroller preferredScrollerStyle] == NSScrollerStyleOverlay);
 #endif
     
 #if PLATFORM(IOS)
@@ -631,8 +631,8 @@ void WebProcessPool::registerNotificationObservers()
 
 #if ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
     m_scrollerStyleNotificationObserver = [[NSNotificationCenter defaultCenter] addObserverForName:NSPreferredScrollerStyleDidChangeNotification object:nil queue:[NSOperationQueue currentQueue] usingBlock:^(NSNotification *notification) {
-        auto scrollbarStyle = [NSScroller preferredScrollerStyle];
-        sendToAllProcesses(Messages::WebProcess::ScrollerStylePreferenceChanged(scrollbarStyle));
+        bool useOverlayScrollbars = m_configuration->forceOverlayScrollbars() || ([NSScroller preferredScrollerStyle] == NSScrollerStyleOverlay);
+        sendToAllProcesses(Messages::WebProcess::ScrollerStylePreferenceChanged(useOverlayScrollbars));
     }];
 #endif
 
diff --git a/Source/WebKit/UIProcess/Cocoa/WebViewImpl.h b/Source/WebKit/UIProcess/Cocoa/WebViewImpl.h
index 70084ece22ea8fb1ce6d4d6f4d0e4300d0b46781..11ec3abcf31e2e4b9e0c44bbee0c3f15ff248af0 100644
--- a/Source/WebKit/UIProcess/Cocoa/WebViewImpl.h
+++ b/Source/WebKit/UIProcess/Cocoa/WebViewImpl.h
@@ -491,6 +491,9 @@ public:
     void provideDataForPasteboard(NSPasteboard *, NSString *type);
     NSArray *namesOfPromisedFilesDroppedAtDestination(NSURL *dropDestination);
 
+// Paywright begin
+    RetainPtr<CGImageRef> takeSnapshotForAutomation();
+// Paywright end
     RefPtr<ViewSnapshot> takeViewSnapshot();
     void saveBackForwardSnapshotForCurrentItem();
     void saveBackForwardSnapshotForItem(WebBackForwardListItem&);
diff --git a/Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm b/Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm
index d06013b887b2c82650962cf581d1b7fe598bfcae..8753478696db815004598f82453037eb7d838647 100644
--- a/Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm
+++ b/Source/WebKit/UIProcess/Cocoa/WebViewImpl.mm
@@ -4513,6 +4513,18 @@ static RetainPtr<CGImageRef> takeWindowSnapshot(CGSWindowID windowID, bool captu
     return adoptCF(CGWindowListCreateImage(CGRectNull, kCGWindowListOptionIncludingWindow, windowID, imageOptions));
 }
 
+// Paywright begin
+RetainPtr<CGImageRef> WebViewImpl::takeSnapshotForAutomation() {
+    NSWindow *window = [m_view window];
+
+    CGSWindowID windowID = (CGSWindowID)window.windowNumber;
+    if (!windowID || !window.isVisible)
+        return nullptr;
+
+    return takeWindowSnapshot(windowID, true);
+}
+// Paywright end
+
 RefPtr<ViewSnapshot> WebViewImpl::takeViewSnapshot()
 {
     NSWindow *window = [m_view window];
diff --git a/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.cpp b/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.cpp
index 5a51b9ec1d68feecb5cf46a10d07c62785ad1fb0..1e165124020ac9e520123a0503d2a4ec30d7c32b 100644
--- a/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.cpp
+++ b/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.cpp
@@ -32,13 +32,16 @@
 #include "DrawingAreaProxyMessages.h"
 #include "LayerTreeContext.h"
 #include "UpdateInfo.h"
+#include "WebPageInspectorController.h"
 #include "WebPageProxy.h"
 #include "WebPreferences.h"
 #include "WebProcessProxy.h"
 #include <WebCore/PlatformDisplay.h>
 #include <WebCore/Region.h>
+#include <wtf/Vector.h>
 
 #if PLATFORM(GTK)
+#include "WebKitWebViewBasePrivate.h"
 #include <gtk/gtk.h>
 #endif
 
@@ -51,6 +54,13 @@
 #include <d3d11_1.h>
 #endif
 
+#if PLATFORM(WIN)
+#include <cairo-win32.h>
+#include <windows.h>
+#include <WebCore/HWndDC.h>
+#include <WebCore/RefPtrCairo.h>
+#endif
+
 namespace WebKit {
 using namespace WebCore;
 
@@ -119,6 +129,10 @@ void DrawingAreaProxyCoordinatedGraphics::paint(BackingStore::PlatformGraphicsCo
 
 void DrawingAreaProxyCoordinatedGraphics::sizeDidChange()
 {
+    for (auto& value : m_callbacks)
+        value();
+    m_callbacks.clear();
+
 #if USE(DIRECT2D)
     m_backingStore = nullptr;
 #endif
@@ -133,6 +147,11 @@ void DrawingAreaProxyCoordinatedGraphics::deviceScaleFactorDidChange()
     backingStoreStateDidChange(RespondImmediately);
 }
 
+void DrawingAreaProxyCoordinatedGraphics::waitForSizeUpdate(Function<void ()>&& callback)
+{
+    m_callbacks.append(WTFMove(callback));
+}
+
 void DrawingAreaProxyCoordinatedGraphics::waitForBackingStoreUpdateOnNextPaint()
 {
     m_hasReceivedFirstUpdate = true;
@@ -238,6 +257,45 @@ void DrawingAreaProxyCoordinatedGraphics::updateAcceleratedCompositingMode(uint6
     updateAcceleratedCompositingMode(layerTreeContext);
 }
 
+#if PLATFORM(WIN)
+void DrawingAreaProxyCoordinatedGraphics::didChangeAcceleratedCompositingMode(bool enabled)
+{
+    m_isInAcceleratedCompositingMode = enabled;
+}
+#endif
+
+#if !PLATFORM(WPE)
+void DrawingAreaProxyCoordinatedGraphics::captureFrame()
+{
+    RefPtr<cairo_surface_t> surface;
+#if PLATFORM(WIN)
+    HWndDC dc;
+    if (m_isInAcceleratedCompositingMode) {
+        dc.setHWnd(m_webPageProxy.viewWidget());
+        surface = adoptRef(cairo_win32_surface_create(dc));
+#else
+    if (isInAcceleratedCompositingMode()) {
+#  if PLATFORM(GTK)
+        AcceleratedBackingStore* backingStore = webkitWebViewBaseGetAcceleratedBackingStore(WEBKIT_WEB_VIEW_BASE(m_webPageProxy.viewWidget()));
+        if (!backingStore)
+            return;
+
+        surface = backingStore->surface();
+#  else
+        fprintf(stderr, "captureFrame() is not supported in accelerated compositing mode on this platform.\n");
+#  endif
+#endif
+    } else if (m_backingStore) {
+        surface = m_backingStore->surface();
+    }
+
+    if (!surface)
+        return;
+
+    m_webPageProxy.inspectorController().didPaint(surface.get());
+}
+#endif
+
 #if !PLATFORM(WPE)
 void DrawingAreaProxyCoordinatedGraphics::incorporateUpdate(const UpdateInfo& updateInfo)
 {
diff --git a/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.h b/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.h
index d7695088e7cfc4f638f157338754f9f157489749..f99c2b7c2a2b5fa666aa7db96a124717eee0e922 100644
--- a/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.h
+++ b/Source/WebKit/UIProcess/CoordinatedGraphics/DrawingAreaProxyCoordinatedGraphics.h
@@ -30,6 +30,7 @@
 #include "BackingStore.h"
 #include "DrawingAreaProxy.h"
 #include "LayerTreeContext.h"
+#include <wtf/Function.h>
 #include <wtf/RunLoop.h>
 
 namespace WebCore {
@@ -49,6 +50,10 @@ public:
 
     bool isInAcceleratedCompositingMode() const { return !m_layerTreeContext.isEmpty(); }
     const LayerTreeContext& layerTreeContext() const { return m_layerTreeContext; }
+    void waitForSizeUpdate(Function<void ()>&&);
+#if !PLATFORM(WPE)
+    void captureFrame();
+#endif
 
 private:
     // DrawingAreaProxy
@@ -63,6 +68,9 @@ private:
     void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&) override;
     void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&) override;
     void updateAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&) override;
+#if PLATFORM(WIN)
+    void didChangeAcceleratedCompositingMode(bool enabled) override;
+#endif
 
 #if !PLATFORM(WPE)
     void incorporateUpdate(const UpdateInfo&);
@@ -126,12 +134,18 @@ private:
     // For a new Drawing Area don't draw anything until the WebProcess has sent over the first content.
     bool m_hasReceivedFirstUpdate { false };
 
+    Vector<Function<void ()>> m_callbacks;
+
 #if !PLATFORM(WPE)
     bool m_isBackingStoreDiscardable { true };
     std::unique_ptr<BackingStore> m_backingStore;
     RunLoop::Timer<DrawingAreaProxyCoordinatedGraphics> m_discardBackingStoreTimer;
 #endif
     std::unique_ptr<DrawingMonitor> m_drawingMonitor;
+
+#if PLATFORM(WIN)
+    bool m_isInAcceleratedCompositingMode { false };
+#endif
 };
 
 } // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Downloads/DownloadProxy.cpp b/Source/WebKit/UIProcess/Downloads/DownloadProxy.cpp
index 29c17beb33ed676c9c444a4d72a601f4cd077f36..a0bb6e0682768e86ca7bec9b1a3f28bb5c309b95 100644
--- a/Source/WebKit/UIProcess/Downloads/DownloadProxy.cpp
+++ b/Source/WebKit/UIProcess/Downloads/DownloadProxy.cpp
@@ -42,8 +42,10 @@
 #include <WebCore/MIMETypeRegistry.h>
 #include <WebCore/ResourceResponseBase.h>
 #include <wtf/FileSystem.h>
+#include <wtf/NeverDestroyed.h>
 #include <wtf/text/CString.h>
 #include <wtf/text/WTFString.h>
+#include <wtf/UUID.h>
 
 namespace WebKit {
 using namespace WebCore;
@@ -56,7 +58,10 @@ DownloadProxy::DownloadProxy(DownloadProxyMap& downloadProxyMap, WebsiteDataStor
     , m_request(resourceRequest)
     , m_originatingPage(makeWeakPtr(originatingPage))
     , m_frameInfo(API::FrameInfo::create(FrameInfoData { frameInfoData }, originatingPage))
+    , m_uuid(createCanonicalUUIDString())
 {
+    if (auto* instrumentation = m_dataStore->downloadInstrumentation())
+      instrumentation->downloadCreated(m_uuid, m_request, frameInfoData, originatingPage);
 }
 
 DownloadProxy::~DownloadProxy() = default;
@@ -75,6 +80,8 @@ void DownloadProxy::cancel(CompletionHandler<void(API::Data*)>&& completionHandl
             m_legacyResumeData = createData(resumeData);
             completionHandler(m_legacyResumeData.get());
             m_downloadProxyMap.downloadFinished(*this);
+            if (auto* instrumentation = m_dataStore->downloadInstrumentation())
+                instrumentation->downloadFinished(m_uuid, "canceled"_s);
         });
     } else
         completionHandler(nullptr);
@@ -147,6 +154,20 @@ void DownloadProxy::didReceiveData(uint64_t bytesWritten, uint64_t totalBytesWri
 
 void DownloadProxy::decideDestinationWithSuggestedFilename(const WebCore::ResourceResponse& response, const String& suggestedFilename, CompletionHandler<void(String, SandboxExtension::Handle, AllowOverwrite)>&& completionHandler)
 {
+    if (auto* instrumentation = m_dataStore->downloadInstrumentation())
+      instrumentation->downloadFilenameSuggested(m_uuid, suggestedFilename);
+
+    if (m_dataStore->allowDownloadForAutomation()) {
+        SandboxExtension::Handle sandboxExtensionHandle;
+        String destination;
+        if (*m_dataStore->allowDownloadForAutomation()) {
+            destination = FileSystem::pathByAppendingComponent(m_dataStore->downloadPathForAutomation(), m_uuid);
+            SandboxExtension::createHandle(destination, SandboxExtension::Type::ReadWrite, sandboxExtensionHandle);
+        }
+        completionHandler(destination, WTFMove(sandboxExtensionHandle), AllowOverwrite::Yes);
+        return;
+    }
+
     m_client->decideDestinationWithSuggestedFilename(*this, response, ResourceResponseBase::sanitizeSuggestedFilename(suggestedFilename), [completionHandler = WTFMove(completionHandler)] (AllowOverwrite allowOverwrite, String destination) mutable {
         SandboxExtension::Handle sandboxExtensionHandle;
         if (!destination.isNull())
@@ -164,6 +185,8 @@ void DownloadProxy::didCreateDestination(const String& path)
 void DownloadProxy::didFinish()
 {
     m_client->didFinish(*this);
+    if (auto* instrumentation = m_dataStore->downloadInstrumentation())
+      instrumentation->downloadFinished(m_uuid, String());
 
     // This can cause the DownloadProxy object to be deleted.
     m_downloadProxyMap.downloadFinished(*this);
@@ -174,6 +197,8 @@ void DownloadProxy::didFail(const ResourceError& error, const IPC::DataReference
     m_legacyResumeData = createData(resumeData);
 
     m_client->didFail(*this, error);
+    if (auto* instrumentation = m_dataStore->downloadInstrumentation())
+      instrumentation->downloadFinished(m_uuid, error.localizedDescription());
 
     // This can cause the DownloadProxy object to be deleted.
     m_downloadProxyMap.downloadFinished(*this);
diff --git a/Source/WebKit/UIProcess/Downloads/DownloadProxy.h b/Source/WebKit/UIProcess/Downloads/DownloadProxy.h
index 0718e893ab255bb3a35df7eda9c3292c1f718a4c..6f549c5a5eb744b4c48f5dca6b4b80474f3586af 100644
--- a/Source/WebKit/UIProcess/Downloads/DownloadProxy.h
+++ b/Source/WebKit/UIProcess/Downloads/DownloadProxy.h
@@ -134,6 +134,7 @@ private:
     Vector<URL> m_redirectChain;
     bool m_wasUserInitiated { true };
     Ref<API::FrameInfo> m_frameInfo;
+    String m_uuid;
 };
 
 } // namespace WebKit
diff --git a/Source/WebKit/UIProcess/DrawingAreaProxy.h b/Source/WebKit/UIProcess/DrawingAreaProxy.h
index 59cdfdafab1d85ea3a5aecb3cd2293e6dfb1eb8d..2c9d8122919bed0b6d7e6f600e5b0c0f9732d1ff 100644
--- a/Source/WebKit/UIProcess/DrawingAreaProxy.h
+++ b/Source/WebKit/UIProcess/DrawingAreaProxy.h
@@ -75,6 +75,7 @@ public:
 
     const WebCore::IntSize& size() const { return m_size; }
     bool setSize(const WebCore::IntSize&, const WebCore::IntSize& scrollOffset = { });
+    void waitForSizeUpdate(Function<void ()>&&);
 
 #if USE(COORDINATED_GRAPHICS) || USE(TEXTURE_MAPPER)
     // The timeout we use when waiting for a DidUpdateGeometry message.
@@ -160,6 +161,9 @@ private:
     virtual void update(uint64_t /* backingStoreStateID */, const UpdateInfo&) { }
     virtual void didUpdateBackingStoreState(uint64_t /* backingStoreStateID */, const UpdateInfo&, const LayerTreeContext&) { }
     virtual void exitAcceleratedCompositingMode(uint64_t /* backingStoreStateID */, const UpdateInfo&) { }
+#endif
+#if PLATFORM(WIN)
+    virtual void didChangeAcceleratedCompositingMode(bool) { }
 #endif
     bool m_startedReceivingMessages { false };
 };
diff --git a/Source/WebKit/UIProcess/DrawingAreaProxy.messages.in b/Source/WebKit/UIProcess/DrawingAreaProxy.messages.in
index b0722e7da81e56530deb570b82ed7cfece970362..05ec3e3ea97ba49135a27d7f9b91f14c507d9318 100644
--- a/Source/WebKit/UIProcess/DrawingAreaProxy.messages.in
+++ b/Source/WebKit/UIProcess/DrawingAreaProxy.messages.in
@@ -36,4 +36,7 @@ messages -> DrawingAreaProxy NotRefCounted {
     DidUpdateBackingStoreState(uint64_t backingStoreStateID, WebKit::UpdateInfo updateInfo, WebKit::LayerTreeContext context)
     ExitAcceleratedCompositingMode(uint64_t backingStoreStateID, WebKit::UpdateInfo updateInfo)
 #endif
+#if PLATFORM(WIN)
+    DidChangeAcceleratedCompositingMode(bool enabled)
+#endif
 }
diff --git a/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp b/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..31abb688f09ce933d4eb33f09873ac38d788f1b2
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.cpp
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorScreencastAgent.h"
+
+#include "GenericCallback.h"
+#include "PageClient.h"
+#include "ScreencastEncoder.h"
+#include "WebPageInspectorController.h"
+#include "WebPageProxy.h"
+#include "WebsiteDataStore.h"
+#include <JavaScriptCore/InspectorFrontendDispatchers.h>
+#include <JavaScriptCore/InspectorFrontendRouter.h>
+#include <WebCore/NotImplemented.h>
+#include <wtf/RunLoop.h>
+#include <wtf/UUID.h>
+
+#if USE(CAIRO)
+#include "DrawingAreaProxyCoordinatedGraphics.h"
+#include "DrawingAreaProxy.h"
+#endif
+
+namespace WebKit {
+
+using namespace Inspector;
+
+InspectorScreencastAgent::InspectorScreencastAgent(BackendDispatcher& backendDispatcher, Inspector::FrontendRouter& frontendRouter, WebPageProxy& page)
+    : InspectorAgentBase("Screencast"_s)
+    , m_backendDispatcher(ScreencastBackendDispatcher::create(backendDispatcher, this))
+    , m_page(page)
+{
+}
+
+InspectorScreencastAgent::~InspectorScreencastAgent()
+{
+}
+
+void InspectorScreencastAgent::didCreateFrontendAndBackend(FrontendRouter*, BackendDispatcher*)
+{
+}
+
+void InspectorScreencastAgent::willDestroyFrontendAndBackend(DisconnectReason)
+{
+    if (!m_encoder)
+        return;
+
+    // The agent may be destroyed when the callback is invoked.
+    m_encoder->finish([sessionID = m_page.websiteDataStore().sessionID(), screencastID = WTFMove(m_currentScreencastID)] {
+        if (WebPageInspectorController::observer())
+            WebPageInspectorController::observer()->didFinishScreencast(sessionID, screencastID);
+    });
+
+    m_encoder = nullptr;
+}
+
+#if USE(CAIRO)
+void InspectorScreencastAgent::didPaint(cairo_surface_t* surface)
+{
+    if (m_encoder)
+        m_encoder->encodeFrame(surface, m_page.drawingArea()->size());
+}
+#endif
+
+Inspector::Protocol::ErrorStringOr<String /* screencastID */> InspectorScreencastAgent::start(const String& file, int width, int height, Optional<double>&& scale)
+{
+    if (m_encoder)
+        return makeUnexpected("Already recording"_s);
+
+    if (width < 10 || width > 10000 || height < 10 || height > 10000)
+        return makeUnexpected("Invalid size"_s);
+
+    if (scale && (*scale <= 0 || *scale > 1))
+        return makeUnexpected("Unsupported scale"_s);
+
+    String errorString;
+    m_encoder = ScreencastEncoder::create(errorString, file, WebCore::IntSize(width, height), WTFMove(scale));
+    if (!m_encoder)
+        return makeUnexpected(errorString);
+
+    m_currentScreencastID = createCanonicalUUIDString();
+
+#if PLATFORM(MAC)
+    m_encoder->setOffsetTop(m_page.pageClient().browserToolbarHeight());
+#endif
+#if !PLATFORM(WPE)
+    scheduleFrameEncoding();
+#endif
+    // Force at least one frame on WPE.
+    m_page.forceRepaint(VoidCallback::create([] (CallbackBase::Error) { }));
+
+    return { { m_currentScreencastID } };
+}
+
+void InspectorScreencastAgent::stop(Ref<StopCallback>&& callback)
+{
+    if (!m_encoder) {
+        callback->sendFailure("Not recording"_s);
+        return;
+    }
+
+    // The agent may be destroyed when the callback is invoked.
+    m_encoder->finish([sessionID = m_page.websiteDataStore().sessionID(), screencastID = WTFMove(m_currentScreencastID), callback = WTFMove(callback)] {
+        if (WebPageInspectorController::observer())
+            WebPageInspectorController::observer()->didFinishScreencast(sessionID, screencastID);
+        callback->sendSuccess();
+    });
+    m_encoder = nullptr;
+}
+
+#if !PLATFORM(WPE)
+void InspectorScreencastAgent::scheduleFrameEncoding()
+{
+    if (!m_encoder)
+        return;
+
+    RunLoop::main().dispatchAfter(Seconds(1.0 / ScreencastEncoder::fps), [agent = makeWeakPtr(this)]() mutable {
+        if (!agent)
+            return;
+
+        agent->encodeFrame();
+        agent->scheduleFrameEncoding();
+    });
+}
+#endif
+
+#if PLATFORM(MAC)
+void InspectorScreencastAgent::encodeFrame()
+{
+    if (m_encoder)
+        m_encoder->encodeFrame(m_page.pageClient().takeSnapshotForAutomation());
+}
+#endif
+
+#if USE(CAIRO) && !PLATFORM(WPE)
+void InspectorScreencastAgent::encodeFrame()
+{
+    if (!m_encoder)
+        return;
+
+    if (auto* drawingArea = m_page.drawingArea())
+        static_cast<DrawingAreaProxyCoordinatedGraphics*>(drawingArea)->captureFrame();
+}
+#endif
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.h b/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..0d4a837cbb0bbba71e32ed083a4c4cfe9b5e4a27
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/Agents/InspectorScreencastAgent.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <JavaScriptCore/InspectorAgentBase.h>
+#include <JavaScriptCore/InspectorBackendDispatchers.h>
+
+#include <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/WeakPtr.h>
+
+namespace Inspector {
+class BackendDispatcher;
+class FrontendChannel;
+class FrontendRouter;
+class ScreencastFrontendDispatcher;
+}
+
+namespace WebKit {
+
+class ScreencastEncoder;
+class WebPageProxy;
+
+class InspectorScreencastAgent : public Inspector::InspectorAgentBase, public Inspector::ScreencastBackendDispatcherHandler, public CanMakeWeakPtr<InspectorScreencastAgent> {
+    WTF_MAKE_NONCOPYABLE(InspectorScreencastAgent);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    InspectorScreencastAgent(Inspector::BackendDispatcher& backendDispatcher, Inspector::FrontendRouter& frontendRouter, WebPageProxy& page);
+    ~InspectorScreencastAgent() override;
+
+    void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) override;
+    void willDestroyFrontendAndBackend(Inspector::DisconnectReason) override;
+
+#if USE(CAIRO)
+    void didPaint(cairo_surface_t*);
+#endif
+
+    Inspector::Protocol::ErrorStringOr<String /* screencastID */> start(const String& file, int width, int height, Optional<double>&& scale) override;
+    void stop(Ref<StopCallback>&&) override;
+
+
+private:
+#if !PLATFORM(WPE)
+    void scheduleFrameEncoding();
+    void encodeFrame();
+#endif
+
+    Ref<Inspector::ScreencastBackendDispatcher> m_backendDispatcher;
+    WebPageProxy& m_page;
+    RefPtr<ScreencastEncoder> m_encoder;
+    String m_currentScreencastID;
+};
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/Agents/ScreencastEncoder.cpp b/Source/WebKit/UIProcess/Inspector/Agents/ScreencastEncoder.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..bc0bca0fcd5fe15d6ace9acb6bd21045633dc0de
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/Agents/ScreencastEncoder.cpp
@@ -0,0 +1,394 @@
+/*
+ * Copyright (c) 2010, The WebM Project authors. All rights reserved.
+ * Copyright (c) 2013 The Chromium Authors. All rights reserved.
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ScreencastEncoder.h"
+
+#include "WebMFileWriter.h"
+#include <algorithm>
+#include <libyuv.h>
+#include <vpx/vp8.h>
+#include <vpx/vp8cx.h>
+#include <vpx/vpx_encoder.h>
+#include <wtf/RunLoop.h>
+#include <wtf/UniqueArray.h>
+#include <wtf/WorkQueue.h>
+#include <wtf/text/StringConcatenateNumbers.h>
+
+#if USE(CAIRO)
+#include <WebCore/RefPtrCairo.h>
+#endif
+
+using namespace WebCore;
+
+namespace WebKit {
+
+namespace {
+
+// Number of timebase unints per one frame.
+constexpr int timeScale = 1000;
+
+// Defines the dimension of a macro block. This is used to compute the active
+// map for the encoder.
+const int kMacroBlockSize = 16;
+
+void createImage(unsigned int width, unsigned int height,
+                 std::unique_ptr<vpx_image_t>& out_image,
+                 std::unique_ptr<uint8_t[]>& out_image_buffer) {
+  std::unique_ptr<vpx_image_t> image(new vpx_image_t());
+  memset(image.get(), 0, sizeof(vpx_image_t));
+
+  // libvpx seems to require both to be assigned.
+  image->d_w = width;
+  image->w = width;
+  image->d_h = height;
+  image->h = height;
+
+  // I420
+  image->fmt = VPX_IMG_FMT_YV12;
+  image->x_chroma_shift = 1;
+  image->y_chroma_shift = 1;
+
+  // libyuv's fast-path requires 16-byte aligned pointers and strides, so pad
+  // the Y, U and V planes' strides to multiples of 16 bytes.
+  const int y_stride = ((image->w - 1) & ~15) + 16;
+  const int uv_unaligned_stride = y_stride >> image->x_chroma_shift;
+  const int uv_stride = ((uv_unaligned_stride - 1) & ~15) + 16;
+
+  // libvpx accesses the source image in macro blocks, and will over-read
+  // if the image is not padded out to the next macroblock: crbug.com/119633.
+  // Pad the Y, U and V planes' height out to compensate.
+  // Assuming macroblocks are 16x16, aligning the planes' strides above also
+  // macroblock aligned them.
+  static_assert(kMacroBlockSize == 16, "macroblock_size_not_16");
+  const int y_rows = ((image->h - 1) & ~(kMacroBlockSize-1)) + kMacroBlockSize;
+  const int uv_rows = y_rows >> image->y_chroma_shift;
+
+  // Allocate a YUV buffer large enough for the aligned data & padding.
+  const int buffer_size = y_stride * y_rows + 2*uv_stride * uv_rows;
+  std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[buffer_size]);
+
+  // Reset image value to 128 so we just need to fill in the y plane.
+  memset(image_buffer.get(), 128, buffer_size);
+
+  // Fill in the information for |image_|.
+  unsigned char* uchar_buffer =
+      reinterpret_cast<unsigned char*>(image_buffer.get());
+  image->planes[0] = uchar_buffer;
+  image->planes[1] = image->planes[0] + y_stride * y_rows;
+  image->planes[2] = image->planes[1] + uv_stride * uv_rows;
+  image->stride[0] = y_stride;
+  image->stride[1] = uv_stride;
+  image->stride[2] = uv_stride;
+
+  out_image = std::move(image);
+  out_image_buffer = std::move(image_buffer);
+}
+
+} // namespace
+
+class ScreencastEncoder::VPXFrame {
+    WTF_MAKE_NONCOPYABLE(VPXFrame);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+#if USE(CAIRO)
+    explicit VPXFrame(RefPtr<cairo_surface_t>&& surface)
+        : m_surface(WTFMove(surface))
+    { }
+#elif PLATFORM(MAC)
+    VPXFrame(RetainPtr<CGImageRef> windowImage, Optional<double> scale, int offsetTop)
+        : m_windowImage(WTFMove(windowImage))
+        , m_scale(scale)
+        , m_offsetTop(offsetTop)
+    { }
+#endif
+
+    void setDuration(Seconds duration) { m_duration = duration; }
+    Seconds duration() const { return m_duration; }
+
+    void convertToVpxImage(vpx_image_t* image)
+    {
+#if USE(CAIRO)
+        // Convert the updated region to YUV ready for encoding.
+        const uint8_t* argb_data = cairo_image_surface_get_data(m_surface.get());
+        int argb_stride = cairo_image_surface_get_stride(m_surface.get());
+#elif PLATFORM(MAC)
+        int argb_stride = image->w * 4;
+        UniqueArray<uint8_t> buffer = makeUniqueArray<uint8_t>(argb_stride * image->h);
+        uint8_t* argb_data = buffer.get();
+        ScreencastEncoder::imageToARGB(m_windowImage.get(), argb_data, image->w, image->h, m_scale, m_offsetTop);
+#endif
+        const int y_stride = image->stride[0];
+        ASSERT(image->stride[1] == image->stride[2]);
+        const int uv_stride = image->stride[1];
+        uint8_t* y_data = image->planes[0];
+        uint8_t* u_data = image->planes[1];
+        uint8_t* v_data = image->planes[2];
+
+        // TODO: redraw only damaged regions?
+        libyuv::ARGBToI420(argb_data, argb_stride,
+                            y_data, y_stride,
+                            u_data, uv_stride,
+                            v_data, uv_stride,
+                            image->w, image->h);
+    }
+
+private:
+#if USE(CAIRO)
+    RefPtr<cairo_surface_t> m_surface;
+#elif PLATFORM(MAC)
+    RetainPtr<CGImageRef> m_windowImage;
+    Optional<double> m_scale;
+    int m_offsetTop { 0 };
+#endif
+    Seconds m_duration;
+};
+
+
+class ScreencastEncoder::VPXCodec {
+public:
+    VPXCodec(vpx_codec_ctx_t codec, vpx_codec_enc_cfg_t cfg, FILE* file)
+        : m_encoderQueue(WorkQueue::create("Screencast encoder"))
+        , m_codec(codec)
+        , m_cfg(cfg)
+        , m_file(file)
+        , m_writer(new WebMFileWriter(file, &m_cfg))
+    {
+        createImage(cfg.g_w, cfg.g_h, m_image, m_imageBuffer);
+    }
+
+    void encodeFrameAsync(std::unique_ptr<VPXFrame>&& frame)
+    {
+        m_encoderQueue->dispatch([this, frame = WTFMove(frame)] {
+            frame->convertToVpxImage(m_image.get());
+            double frameCount = frame->duration().seconds() * fps;
+            // For long duration repeat frame at 1 fps to ensure last frame duration is short enough.
+            // TODO: figure out why simply passing duration doesn't work well.
+            for (;frameCount > 1.5; frameCount -= 1) {
+                encodeFrame(m_image.get(), timeScale);
+            }
+            encodeFrame(m_image.get(), std::max<int>(1, frameCount * timeScale));
+        });
+    }
+
+    void finishAsync(Function<void()>&& callback)
+    {
+        m_encoderQueue->dispatch([this, callback = WTFMove(callback)] {
+            finish();
+            callback();
+        });
+    }
+
+private:
+    bool encodeFrame(vpx_image_t *img, int duration)
+    {
+        vpx_codec_iter_t iter = nullptr;
+        const vpx_codec_cx_pkt_t *pkt = nullptr;
+        int flags = 0;
+        const vpx_codec_err_t res = vpx_codec_encode(&m_codec, img, m_pts, duration, flags, VPX_DL_REALTIME);
+        if (res != VPX_CODEC_OK) {
+            fprintf(stderr, "Failed to encode frame: %s\n", vpx_codec_error(&m_codec));
+            return false;
+        }
+
+        bool gotPkts = false;
+        while ((pkt = vpx_codec_get_cx_data(&m_codec, &iter)) != nullptr) {
+            gotPkts = true;
+
+            if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
+                if (!m_writer->writeFrame(pkt)) {
+                    fprintf(stderr, "Failed to write compressed frame\n");
+                    return false;
+                }
+                bool keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
+                ++m_frameCount;
+                fprintf(stderr, "  #%03d %spts=%" PRId64 " sz=%zd\n", m_frameCount, keyframe ? "[K] " : "", pkt->data.frame.pts, pkt->data.frame.sz);
+                m_pts += pkt->data.frame.duration;
+            }
+        }
+
+        return gotPkts;
+    }
+
+    void finish()
+    {
+        // Flush encoder.
+        while (encodeFrame(nullptr, 1))
+            ++m_frameCount;
+
+        m_writer->finish();
+        fclose(m_file);
+        fprintf(stderr, "ScreencastEncoder::finish %d frames\n", m_frameCount);
+    }
+
+    Ref<WorkQueue> m_encoderQueue;
+    vpx_codec_ctx_t m_codec;
+    vpx_codec_enc_cfg_t m_cfg;
+    FILE* m_file { nullptr };
+    std::unique_ptr<WebMFileWriter> m_writer;
+    int m_frameCount { 0 };
+    int64_t m_pts { 0 };
+    std::unique_ptr<uint8_t[]> m_imageBuffer;
+    std::unique_ptr<vpx_image_t> m_image;
+};
+
+ScreencastEncoder::ScreencastEncoder(std::unique_ptr<VPXCodec>&& vpxCodec, IntSize size, Optional<double> scale)
+    : m_vpxCodec(WTFMove(vpxCodec))
+    , m_size(size)
+    , m_scale(scale)
+{
+    ASSERT(!size.isZero());
+}
+
+ScreencastEncoder::~ScreencastEncoder()
+{
+}
+
+RefPtr<ScreencastEncoder> ScreencastEncoder::create(String& errorString, const String& filePath, IntSize size, Optional<double> scale)
+{
+    vpx_codec_iface_t* codec_interface = vpx_codec_vp8_cx();
+    if (!codec_interface) {
+        errorString = "Codec not found.";
+        return nullptr;
+    }
+
+    if (size.width() <= 0 || size.height() <= 0 || (size.width() % 2) != 0 || (size.height() % 2) != 0) {
+        errorString = makeString("Invalid frame size: "_s, size.width(), "x"_s, size.height());
+        return nullptr;
+    }
+
+    vpx_codec_enc_cfg_t cfg;
+    memset(&cfg, 0, sizeof(cfg));
+    vpx_codec_err_t error = vpx_codec_enc_config_default(codec_interface, &cfg, 0);
+    if (error) {
+        errorString = makeString("Failed to get default codec config: "_s, vpx_codec_err_to_string(error));
+        return nullptr;
+    }
+
+    cfg.g_w = size.width();
+    cfg.g_h = size.height();
+    cfg.g_timebase.num = 1;
+    cfg.g_timebase.den = fps * timeScale;
+    cfg.g_error_resilient = VPX_ERROR_RESILIENT_DEFAULT;
+
+    vpx_codec_ctx_t codec;
+    if (vpx_codec_enc_init(&codec, codec_interface, &cfg, 0)) {
+        errorString = makeString("Failed to initialize encoder: "_s, vpx_codec_error(&codec));
+        return nullptr;
+    }
+
+    FILE* file = fopen(filePath.utf8().data(), "wb");
+    if (!file) {
+        errorString = makeString("Failed to open file '", filePath, "' for writing: ", strerror(errno));
+        return nullptr;
+    }
+
+    std::unique_ptr<VPXCodec> vpxCodec(new VPXCodec(codec, cfg, file));
+    fprintf(stderr, "ScreencastEncoder initialized with: %s\n", vpx_codec_iface_name(codec_interface));
+    return adoptRef(new ScreencastEncoder(WTFMove(vpxCodec), size, scale));
+}
+
+void ScreencastEncoder::flushLastFrame()
+{
+    MonotonicTime now = MonotonicTime::now();
+    if (m_lastFrameTimestamp) {
+        // If previous frame encoding failed for some rason leave the timestampt intact.
+        if (!m_lastFrame)
+            return;
+
+        Seconds seconds = now - m_lastFrameTimestamp;
+        m_lastFrame->setDuration(seconds);
+        m_vpxCodec->encodeFrameAsync(WTFMove(m_lastFrame));
+    }
+    m_lastFrameTimestamp = now;
+}
+
+#if USE(CAIRO)
+void ScreencastEncoder::encodeFrame(cairo_surface_t* drawingAreaSurface, IntSize size)
+{
+    fprintf(stderr, "ScreencastEncoder::encodeFrame\n");
+    flushLastFrame();
+    // Note that in WPE drawing area size is updated asynchronously and may differ from acutal
+    // size of the surface.
+    if (size.isZero()) {
+        fprintf(stderr, "Cairo surface size is 0\n");
+        return;
+    }
+
+    // TODO: adjust device scale factor?
+    RefPtr<cairo_surface_t> surface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, m_size.width(), m_size.height()));
+    {
+        RefPtr<cairo_t> cr = adoptRef(cairo_create(surface.get()));
+
+        // TODO: compare to libyuv scale functions?
+        cairo_matrix_t transform;
+        if (m_scale) {
+            cairo_matrix_init_scale(&transform, *m_scale, *m_scale);
+            cairo_transform(cr.get(), &transform);
+        } else if (size.width() > m_size.width() || size.height() > m_size.height()) {
+            // If no scale is specified shrink to fit the frame.
+            double scale = std::min(static_cast<double>(m_size.width()) / size.width(),
+                                    static_cast<double>(m_size.height()) / size.height());
+            cairo_matrix_init_scale(&transform, scale, scale);
+            cairo_transform(cr.get(), &transform);
+        }
+
+        // Record top left part of the drawing area that fits into the frame.
+        cairo_set_source_surface(cr.get(), drawingAreaSurface, 0, 0);
+        cairo_paint(cr.get());
+    }
+    cairo_surface_flush(surface.get());
+
+    m_lastFrame = makeUnique<VPXFrame>(WTFMove(surface));
+}
+#elif PLATFORM(MAC)
+void ScreencastEncoder::encodeFrame(RetainPtr<CGImageRef>&& windowImage)
+{
+    fprintf(stderr, "ScreencastEncoder::encodeFrame\n");
+    flushLastFrame();
+
+    m_lastFrame = makeUnique<VPXFrame>(WTFMove(windowImage), m_scale, m_offsetTop);
+}
+#endif
+
+void ScreencastEncoder::finish(Function<void()>&& callback)
+{
+    if (!m_vpxCodec) {
+        callback();
+        return;
+    }
+
+    flushLastFrame();
+    m_vpxCodec->finishAsync([protectRef = makeRef(*this), callback = WTFMove(callback)] () mutable {
+        RunLoop::main().dispatch([callback = WTFMove(callback)] {
+            callback();
+        });
+    });
+}
+
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/Agents/ScreencastEncoder.h b/Source/WebKit/UIProcess/Inspector/Agents/ScreencastEncoder.h
new file mode 100644
index 0000000000000000000000000000000000000000..c9ff0442e072d54c089540d291b7963688b6474b
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/Agents/ScreencastEncoder.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <WebCore/IntSize.h>
+#include <wtf/Forward.h>
+#include <wtf/MonotonicTime.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/ThreadSafeRefCounted.h>
+#include <wtf/WeakPtr.h>
+
+#if USE(CAIRO)
+#include <cairo.h>
+#endif
+
+namespace WebKit {
+
+class WebPageProxy;
+
+class ScreencastEncoder : public ThreadSafeRefCounted<ScreencastEncoder> {
+    WTF_MAKE_NONCOPYABLE(ScreencastEncoder);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static constexpr int fps = 25;
+
+    static RefPtr<ScreencastEncoder> create(String& errorString, const String& filePath, WebCore::IntSize, Optional<double> scale);
+
+    class VPXCodec;
+    ScreencastEncoder(std::unique_ptr<VPXCodec>&&, WebCore::IntSize, Optional<double> scale);
+    ~ScreencastEncoder();
+
+#if USE(CAIRO)
+    void encodeFrame(cairo_surface_t*, WebCore::IntSize);
+#elif PLATFORM(MAC)
+    void encodeFrame(RetainPtr<CGImageRef>&&);
+    void setOffsetTop(int offset) { m_offsetTop = offset;}
+#endif
+
+    void finish(Function<void()>&& callback);
+
+private:
+    void flushLastFrame();
+#if PLATFORM(MAC)
+    static void imageToARGB(CGImageRef, uint8_t* rgba_data, int width, int height, Optional<double> scale, int offsetTop);
+#endif
+
+    std::unique_ptr<VPXCodec> m_vpxCodec;
+    const WebCore::IntSize m_size;
+    Optional<double> m_scale;
+    MonotonicTime m_lastFrameTimestamp;
+    class VPXFrame;
+    std::unique_ptr<VPXFrame> m_lastFrame;
+#if PLATFORM(MAC)
+    int m_offsetTop { 0 };
+#endif
+};
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/Agents/WebMFileWriter.cpp b/Source/WebKit/UIProcess/Inspector/Agents/WebMFileWriter.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9b269b356e206f0252245a1497adb0d05128c9b4
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/Agents/WebMFileWriter.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2014 The WebM project authors. All Rights Reserved.
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebMFileWriter.h"
+
+#include <string>
+#include "mkvmuxer/mkvmuxerutil.h"
+
+namespace WebKit {
+
+WebMFileWriter::WebMFileWriter(FILE* file, vpx_codec_enc_cfg_t* cfg)
+    : m_cfg(cfg)
+    , m_writer(new mkvmuxer::MkvWriter(file))
+    , m_segment(new mkvmuxer::Segment()) {
+  m_segment->Init(m_writer.get());
+  m_segment->set_mode(mkvmuxer::Segment::kFile);
+  m_segment->OutputCues(true);
+
+  mkvmuxer::SegmentInfo* info = m_segment->GetSegmentInfo();
+  std::string version = "Playwright " + std::string(vpx_codec_version_str());
+  info->set_writing_app(version.c_str());
+
+  // Add vp8 track.
+  m_videoTrackId = m_segment->AddVideoTrack(
+      static_cast<int>(m_cfg->g_w), static_cast<int>(m_cfg->g_h), 0);
+  if (!m_videoTrackId) {
+    fprintf(stderr, "Failed to add video track\n");
+  }
+}
+
+WebMFileWriter::~WebMFileWriter() {}
+
+bool WebMFileWriter::writeFrame(const vpx_codec_cx_pkt_t* pkt) {
+  int64_t pts_ns = pkt->data.frame.pts * 1000000000ll * m_cfg->g_timebase.num /
+                   m_cfg->g_timebase.den;
+  return m_segment->AddFrame(static_cast<uint8_t*>(pkt->data.frame.buf),
+                             pkt->data.frame.sz, m_videoTrackId, pts_ns,
+                             pkt->data.frame.flags & VPX_FRAME_IS_KEY);
+}
+
+void WebMFileWriter::finish() {
+  m_segment->Finalize();
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/Agents/WebMFileWriter.h b/Source/WebKit/UIProcess/Inspector/Agents/WebMFileWriter.h
new file mode 100644
index 0000000000000000000000000000000000000000..e2ce910f3fd7f587add552275b7e7176cf8b2723
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/Agents/WebMFileWriter.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <memory>
+#include <stdio.h>
+#include <stdlib.h>
+#include "vpx/vpx_encoder.h"
+
+#include "mkvmuxer/mkvmuxer.h"
+#include "mkvmuxer/mkvwriter.h"
+
+namespace WebKit {
+
+class WebMFileWriter {
+public:
+    WebMFileWriter(FILE*, vpx_codec_enc_cfg_t* cfg);
+    ~WebMFileWriter();
+
+    bool writeFrame(const vpx_codec_cx_pkt_t* pkt);
+    void finish();
+
+private:
+    vpx_codec_enc_cfg_t* m_cfg = nullptr;
+    std::unique_ptr<mkvmuxer::MkvWriter> m_writer;
+    std::unique_ptr<mkvmuxer::Segment> m_segment;
+    uint64_t m_videoTrackId = 0;
+};
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.cpp b/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.cpp
index 6928ca2fbfb6939062e3cd14bb7ba6f2fdc87f5f..621b99e233ed5cf504fedbd3ca3209c03bcd611f 100644
--- a/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.cpp
+++ b/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.cpp
@@ -27,11 +27,10 @@
 #include "InspectorTargetProxy.h"
 
 #include "ProvisionalPageProxy.h"
-#include "WebFrameProxy.h"
+#include "WebPageInspectorController.h"
 #include "WebPageInspectorTarget.h"
 #include "WebPageMessages.h"
 #include "WebPageProxy.h"
-#include "WebProcessProxy.h"
 
 namespace WebKit {
 
@@ -39,18 +38,17 @@ using namespace Inspector;
 
 std::unique_ptr<InspectorTargetProxy> InspectorTargetProxy::create(WebPageProxy& page, const String& targetId, Inspector::InspectorTargetType type)
 {
-    return makeUnique<InspectorTargetProxy>(page, targetId, type);
+    return makeUnique<InspectorTargetProxy>(page, nullptr, targetId, type);
 }
 
-std::unique_ptr<InspectorTargetProxy> InspectorTargetProxy::create(ProvisionalPageProxy& provisionalPage, const String& targetId, Inspector::InspectorTargetType type)
+std::unique_ptr<InspectorTargetProxy> InspectorTargetProxy::create(ProvisionalPageProxy& provisionalPage, const String& targetId)
 {
-    auto target = InspectorTargetProxy::create(provisionalPage.page(), targetId, type);
-    target->m_provisionalPage = makeWeakPtr(provisionalPage);
-    return target;
+    return makeUnique<InspectorTargetProxy>(provisionalPage.page(), &provisionalPage, targetId, Inspector::InspectorTargetType::Page);
 }
 
-InspectorTargetProxy::InspectorTargetProxy(WebPageProxy& page, const String& targetId, Inspector::InspectorTargetType type)
+InspectorTargetProxy::InspectorTargetProxy(WebPageProxy& page, ProvisionalPageProxy* provisionalPage, const String& targetId, Inspector::InspectorTargetType type)
     : m_page(page)
+    , m_provisionalPage(makeWeakPtr(provisionalPage))
     , m_identifier(targetId)
     , m_type(type)
 {
@@ -97,6 +95,31 @@ void InspectorTargetProxy::didCommitProvisionalTarget()
     m_provisionalPage = nullptr;
 }
 
+void InspectorTargetProxy::willResume()
+{
+    if (m_page.hasRunningProcess())
+        m_page.send(Messages::WebPage::ResumeInspectorIfPausedInNewWindow());
+}
+
+void InspectorTargetProxy::activate(String& error)
+{
+    if (m_type != Inspector::InspectorTargetType::Page)
+        return InspectorTarget::activate(error);
+
+    platformActivate(error);
+}
+
+void InspectorTargetProxy::close(String& error, bool runBeforeUnload)
+{
+    if (m_type != Inspector::InspectorTargetType::Page)
+        return InspectorTarget::close(error, runBeforeUnload);
+
+    if (runBeforeUnload)
+        m_page.tryClose();
+    else
+        m_page.closePage();
+}
+
 bool InspectorTargetProxy::isProvisional() const
 {
     return !!m_provisionalPage;
diff --git a/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.h b/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.h
index a2239cec8e18850f35f7f88a9c4ebadc62bf4023..79f3ff84327dc075ec96983e04db4b10343b7fae 100644
--- a/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.h
+++ b/Source/WebKit/UIProcess/Inspector/InspectorTargetProxy.h
@@ -37,13 +37,13 @@ class WebPageProxy;
 // NOTE: This UIProcess side InspectorTarget doesn't care about the frontend channel, since
 // any target -> frontend messages will be routed to the WebPageProxy with a targetId.
 
-class InspectorTargetProxy final : public Inspector::InspectorTarget {
+class InspectorTargetProxy : public Inspector::InspectorTarget {
     WTF_MAKE_FAST_ALLOCATED;
     WTF_MAKE_NONCOPYABLE(InspectorTargetProxy);
 public:
     static std::unique_ptr<InspectorTargetProxy> create(WebPageProxy&, const String& targetId, Inspector::InspectorTargetType);
-    static std::unique_ptr<InspectorTargetProxy> create(ProvisionalPageProxy&, const String& targetId, Inspector::InspectorTargetType);
-    InspectorTargetProxy(WebPageProxy&, const String& targetId, Inspector::InspectorTargetType);
+    static std::unique_ptr<InspectorTargetProxy> create(ProvisionalPageProxy&, const String& targetId);
+    InspectorTargetProxy(WebPageProxy&, ProvisionalPageProxy*, const String& targetId, Inspector::InspectorTargetType);
     ~InspectorTargetProxy() = default;
 
     Inspector::InspectorTargetType type() const final { return m_type; }
@@ -55,12 +55,17 @@ public:
     void connect(Inspector::FrontendChannel::ConnectionType) override;
     void disconnect() override;
     void sendMessageToTargetBackend(const String&) override;
+    void activate(String& error) override;
+    void close(String& error, bool runBeforeUnload) override;
 
 private:
+    void willResume() override;
+    void platformActivate(String& error) const;
+
     WebPageProxy& m_page;
+    WeakPtr<ProvisionalPageProxy> m_provisionalPage;
     String m_identifier;
     Inspector::InspectorTargetType m_type;
-    WeakPtr<ProvisionalPageProxy> m_provisionalPage;
 };
 
 } // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.cpp b/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.cpp
index 1861cff806131196ea49b4f8aca6665beebbf6e8..901c0fdd6bc1bd62b078a07cc9dd3a4c46c2bfd8 100644
--- a/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.cpp
+++ b/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.cpp
@@ -26,12 +26,20 @@
 #include "config.h"
 #include "WebPageInspectorController.h"
 
+#include "APINavigation.h"
 #include "InspectorBrowserAgent.h"
+#include "InspectorDialogAgent.h"
+#include "InspectorScreencastAgent.h"
 #include "ProvisionalPageProxy.h"
 #include "WebFrameProxy.h"
 #include "WebPageInspectorAgentBase.h"
+#include "WebPageInspectorEmulationAgent.h"
+#include "WebPageInspectorInputAgent.h"
 #include "WebPageInspectorTarget.h"
 #include "WebPageProxy.h"
+#include "WebPreferences.h"
+#include <WebCore/ResourceError.h>
+#include <WebCore/WindowFeatures.h>
 #include <JavaScriptCore/InspectorAgentBase.h>
 #include <JavaScriptCore/InspectorBackendDispatcher.h>
 #include <JavaScriptCore/InspectorBackendDispatchers.h>
@@ -48,27 +56,108 @@ static String getTargetID(const ProvisionalPageProxy& provisionalPage)
     return WebPageInspectorTarget::toTargetID(provisionalPage.webPageID());
 }
 
+WebPageInspectorControllerObserver* WebPageInspectorController::s_observer = nullptr;
+
+void WebPageInspectorController::setObserver(WebPageInspectorControllerObserver* observer)
+{
+    s_observer = observer;
+}
+
+WebPageInspectorControllerObserver* WebPageInspectorController::observer() {
+    return s_observer;
+}
+
 WebPageInspectorController::WebPageInspectorController(WebPageProxy& page)
     : m_frontendRouter(FrontendRouter::create())
     , m_backendDispatcher(BackendDispatcher::create(m_frontendRouter.copyRef()))
     , m_page(page)
 {
-    auto targetAgent = makeUnique<InspectorTargetAgent>(m_frontendRouter.get(), m_backendDispatcher.get());
-    m_targetAgent = targetAgent.get();
-    m_agents.append(WTFMove(targetAgent));
 }
 
 void WebPageInspectorController::init()
 {
+    auto targetAgent = makeUnique<InspectorTargetAgent>(m_frontendRouter.get(), m_backendDispatcher.get());
+    m_targetAgent = targetAgent.get();
+    m_agents.append(WTFMove(targetAgent));
+    auto emulationAgent = makeUnique<WebPageInspectorEmulationAgent>(m_backendDispatcher.get(), m_page);
+    m_emulationAgent = emulationAgent.get();
+    m_agents.append(WTFMove(emulationAgent));
+    auto inputAgent = makeUnique<WebPageInspectorInputAgent>(m_backendDispatcher.get(), m_page);
+    m_inputAgent = inputAgent.get();
+    m_agents.append(WTFMove(inputAgent));
+    m_agents.append(makeUnique<InspectorDialogAgent>(m_backendDispatcher.get(), m_frontendRouter.get(), m_page));
+    auto screencastAgent = makeUnique<InspectorScreencastAgent>(m_backendDispatcher.get(), m_frontendRouter.get(), m_page);
+    m_screecastAgent = screencastAgent.get();
+    m_agents.append(WTFMove(screencastAgent));
+    if (s_observer)
+        s_observer->didCreateInspectorController(m_page);
+
+    // window.open will create page with already running process.
+    if (!m_page.hasRunningProcess())
+        return;
     String pageTargetId = WebPageInspectorTarget::toTargetID(m_page.webPageID());
     createInspectorTarget(pageTargetId, Inspector::InspectorTargetType::Page);
 }
 
+void WebPageInspectorController::didFinishAttachingToWebProcess()
+{
+    String pageTargetID = WebPageInspectorTarget::toTargetID(m_page.webPageID());
+    // Create target only after attaching to a Web Process first time. Before that
+    // we cannot event establish frontend connection.
+    if (m_targets.contains(pageTargetID))
+        return;
+    createInspectorTarget(pageTargetID, Inspector::InspectorTargetType::Page);
+}
+
 void WebPageInspectorController::pageClosed()
 {
+    String pageTargetId = WebPageInspectorTarget::toTargetID(m_page.webPageID());
+    destroyInspectorTarget(pageTargetId);
+
     disconnectAllFrontends();
 
     m_agents.discardValues();
+
+    if (s_observer)
+        s_observer->willDestroyInspectorController(m_page);
+}
+
+bool WebPageInspectorController::pageCrashed(ProcessTerminationReason reason)
+{
+    if (reason != ProcessTerminationReason::Crash)
+        return false;
+    String targetId = WebPageInspectorTarget::toTargetID(m_page.webPageID());
+    auto it = m_targets.find(targetId);
+    if (it == m_targets.end())
+        return false;
+    m_targetAgent->targetCrashed(*it->value);
+    m_targets.remove(it);
+
+    return m_targetAgent->isConnected();
+}
+
+void WebPageInspectorController::willCreateNewPage(const WebCore::WindowFeatures& features, const URL& url)
+{
+    if (s_observer)
+        s_observer->willCreateNewPage(m_page, features, url);
+}
+
+void WebPageInspectorController::didShowPage()
+{
+    if (m_frontendRouter->hasFrontends())
+        m_emulationAgent->didShowPage();
+}
+
+void WebPageInspectorController::didProcessAllPendingKeyboardEvents()
+{
+    if (m_frontendRouter->hasFrontends())
+        m_inputAgent->didProcessAllPendingKeyboardEvents();
+}
+
+void WebPageInspectorController::didProcessAllPendingMouseEvents()
+{
+    if (m_frontendRouter->hasFrontends())
+        m_inputAgent->didProcessAllPendingMouseEvents();
 }
 
 bool WebPageInspectorController::hasLocalFrontend() const
@@ -82,6 +171,17 @@ void WebPageInspectorController::connectFrontend(Inspector::FrontendChannel& fro
 
     bool connectingFirstFrontend = !m_frontendRouter->hasFrontends();
 
+    // HACK: forcefully disconnect remote connections to show local inspector starting with initial
+    // agents' state.
+    if (frontendChannel.connectionType() == Inspector::FrontendChannel::ConnectionType::Local &&
+        !connectingFirstFrontend && !m_frontendRouter->hasLocalFrontend()) {
+        disconnectAllFrontends();
+        connectingFirstFrontend = true;
+    }
+
+    if (connectingFirstFrontend)
+        adjustPageSettings();
+
     m_frontendRouter->connectFrontend(frontendChannel);
 
     if (connectingFirstFrontend)
@@ -100,8 +200,10 @@ void WebPageInspectorController::disconnectFrontend(FrontendChannel& frontendCha
     m_frontendRouter->disconnectFrontend(frontendChannel);
 
     bool disconnectingLastFrontend = !m_frontendRouter->hasFrontends();
-    if (disconnectingLastFrontend)
+    if (disconnectingLastFrontend) {
         m_agents.willDestroyFrontendAndBackend(DisconnectReason::InspectorDestroyed);
+        m_pendingNavigations.clear();
+    }
 
     m_page.didChangeInspectorFrontendCount(m_frontendRouter->frontendCount());
 
@@ -124,6 +226,8 @@ void WebPageInspectorController::disconnectAllFrontends()
     // Disconnect any remaining remote frontends.
     m_frontendRouter->disconnectAllFrontends();
 
+    m_pendingNavigations.clear();
+
     m_page.didChangeInspectorFrontendCount(m_frontendRouter->frontendCount());
 
 #if ENABLE(REMOTE_INSPECTOR)
@@ -150,6 +254,66 @@ void WebPageInspectorController::setIndicating(bool indicating)
 }
 #endif
 
+#if USE(CAIRO)
+void WebPageInspectorController::didPaint(cairo_surface_t* surface)
+{
+    if (!m_frontendRouter->hasFrontends())
+        return;
+
+    m_screecastAgent->didPaint(surface);
+}
+#endif
+
+
+void WebPageInspectorController::navigate(WebCore::ResourceRequest&& request, WebFrameProxy* frame, NavigationHandler&& completionHandler)
+{
+    auto navigation = m_page.loadRequestForInspector(WTFMove(request), frame);
+    if (!navigation) {
+        completionHandler("Failed to navigate"_s, 0);
+        return;
+    }
+
+    m_pendingNavigations.set(navigation->navigationID(), WTFMove(completionHandler));
+}
+
+void WebPageInspectorController::didReceivePolicyDecision(WebCore::PolicyAction action, uint64_t navigationID)
+{
+    if (!m_frontendRouter->hasFrontends())
+        return;
+
+    if (!navigationID)
+        return;
+
+    auto completionHandler = m_pendingNavigations.take(navigationID);
+    if (!completionHandler)
+        return;
+
+    if (action == WebCore::PolicyAction::Ignore)
+        completionHandler("Navigation cancelled"_s, 0);
+    else
+        completionHandler(String(), navigationID);
+}
+
+void WebPageInspectorController::didDestroyNavigation(uint64_t navigationID)
+{
+    if (!m_frontendRouter->hasFrontends())
+        return;
+
+    auto completionHandler = m_pendingNavigations.take(navigationID);
+    if (!completionHandler)
+        return;
+
+    // Inspector initiated navigation is destroyed before policy check only when it
+    // becomes a fragment navigation (which always reuses current navigation).
+    completionHandler(String(), 0);
+}
+
+void WebPageInspectorController::didFailProvisionalLoadForFrame(uint64_t navigationID, const WebCore::ResourceError& error)
+{
+    if (s_observer)
+        s_observer->didFailProvisionalLoad(m_page, navigationID, error.localizedDescription());
+}
+
 void WebPageInspectorController::createInspectorTarget(const String& targetId, Inspector::InspectorTargetType type)
 {
     addTarget(InspectorTargetProxy::create(m_page, targetId, type));
@@ -169,6 +333,32 @@ void WebPageInspectorController::sendMessageToInspectorFrontend(const String& ta
     m_targetAgent->sendMessageFromTargetToFrontend(targetId, message);
 }
 
+void WebPageInspectorController::setPauseOnStart(bool shouldPause)
+{
+    ASSERT(m_frontendRouter->hasFrontends());
+    m_targetAgent->setPauseOnStart(shouldPause);
+}
+
+bool WebPageInspectorController::shouldPauseLoading() const
+{
+    if (!m_frontendRouter->hasFrontends())
+        return false;
+
+    if (!m_page.isPageOpenedByDOMShowingInitialEmptyDocument())
+        return false;
+
+    auto* target = m_targets.get(WebPageInspectorTarget::toTargetID(m_page.webPageID()));
+    ASSERT(target);
+    return target->isPaused();
+}
+
+void WebPageInspectorController::setContinueLoadingCallback(WTF::Function<void()>&& callback)
+{
+    auto* target = m_targets.get(WebPageInspectorTarget::toTargetID(m_page.webPageID()));
+    ASSERT(target);
+    target->setResumeCallback(WTFMove(callback));
+}
+
 bool WebPageInspectorController::shouldPauseLoading(const ProvisionalPageProxy& provisionalPage) const
 {
     if (!m_frontendRouter->hasFrontends())
@@ -188,7 +378,7 @@ void WebPageInspectorController::setContinueLoadingCallback(const ProvisionalPag
 
 void WebPageInspectorController::didCreateProvisionalPage(ProvisionalPageProxy& provisionalPage)
 {
-    addTarget(InspectorTargetProxy::create(provisionalPage, getTargetID(provisionalPage), Inspector::InspectorTargetType::Page));
+    addTarget(InspectorTargetProxy::create(provisionalPage, getTargetID(provisionalPage)));
 }
 
 void WebPageInspectorController::willDestroyProvisionalPage(const ProvisionalPageProxy& provisionalPage)
@@ -241,4 +431,20 @@ void WebPageInspectorController::addTarget(std::unique_ptr<InspectorTargetProxy>
     m_targets.set(target->identifier(), WTFMove(target));
 }
 
+void WebPageInspectorController::adjustPageSettings()
+{
+    // Set this to true as otherwise updating any preferences will override its
+    // value in the Web Process to false (and InspectorController sets it locally
+    // to true when frontend is connected).
+    m_page.preferences().setDeveloperExtrasEnabled(true);
+
+    // Navigation to cached pages doesn't fire some of the events (e.g. execution context created)
+    // that inspector depends on. So we disable the cache when front-end connects.
+    m_page.preferences().setUsesBackForwardCache(false);
+
+    // Enable popup debugging.
+    // TODO: allow to set preferences over the inspector protocol or find a better place for this.
+    m_page.preferences().setJavaScriptCanOpenWindowsAutomatically(true);
+}
+
 } // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.h b/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.h
index f9c26832d3e91e8d747c5c1e0f0d76c34f4c3096..8b73efbba93362d8eebcc3a52158d8b0f6e4c59d 100644
--- a/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.h
+++ b/Source/WebKit/UIProcess/Inspector/WebPageInspectorController.h
@@ -26,17 +26,35 @@
 #pragma once
 
 #include "InspectorTargetProxy.h"
+#include "ProcessTerminationReason.h"
 #include <JavaScriptCore/InspectorAgentRegistry.h>
 #include <JavaScriptCore/InspectorTargetAgent.h>
 #include <WebCore/PageIdentifier.h>
 #include <wtf/Forward.h>
 #include <wtf/Noncopyable.h>
 #include <wtf/text/WTFString.h>
+#include <wtf/URL.h>
+
+#if USE(CAIRO)
+#include <cairo.h>
+#endif
 
 namespace Inspector {
 class BackendDispatcher;
 class FrontendChannel;
 class FrontendRouter;
+class InspectorTarget;
+}
+
+namespace WebCore {
+class ResourceError;
+class ResourceRequest;
+enum class PolicyAction : uint8_t;
+struct WindowFeatures;
+}
+
+namespace PAL {
+class SessionID;
 }
 
 namespace WebKit {
@@ -44,6 +62,23 @@ namespace WebKit {
 class InspectorBrowserAgent;
 struct WebPageAgentContext;
 
+class InspectorScreencastAgent;
+class WebFrameProxy;
+class WebPageInspectorEmulationAgent;
+class WebPageInspectorInputAgent;
+
+class WebPageInspectorControllerObserver {
+public:
+    virtual void didCreateInspectorController(WebPageProxy&) = 0;
+    virtual void willDestroyInspectorController(WebPageProxy&) = 0;
+    virtual void didFailProvisionalLoad(WebPageProxy&, uint64_t navigationID, const String& error) = 0;
+    virtual void willCreateNewPage(WebPageProxy&, const WebCore::WindowFeatures&, const URL&) = 0;
+    virtual void didFinishScreencast(const PAL::SessionID& sessionID, const String& screencastID) = 0;
+
+protected:
+    virtual ~WebPageInspectorControllerObserver() = default;
+};
+
 class WebPageInspectorController {
     WTF_MAKE_NONCOPYABLE(WebPageInspectorController);
     WTF_MAKE_FAST_ALLOCATED;
@@ -51,7 +86,20 @@ public:
     WebPageInspectorController(WebPageProxy&);
 
     void init();
+    void didFinishAttachingToWebProcess();
+
+    static void setObserver(WebPageInspectorControllerObserver*);
+    static WebPageInspectorControllerObserver* observer();
+
     void pageClosed();
+    bool pageCrashed(ProcessTerminationReason);
+
+    void willCreateNewPage(const WebCore::WindowFeatures&, const URL&);
+
+    void didShowPage();
+
+    void didProcessAllPendingKeyboardEvents();
+    void didProcessAllPendingMouseEvents();
 
     bool hasLocalFrontend() const;
 
@@ -64,11 +112,25 @@ public:
 #if ENABLE(REMOTE_INSPECTOR)
     void setIndicating(bool);
 #endif
+#if USE(CAIRO)
+    void didPaint(cairo_surface_t*);
+#endif
+    using NavigationHandler = Function<void(const String&, uint64_t)>;
+    void navigate(WebCore::ResourceRequest&&, WebFrameProxy*, NavigationHandler&&);
+    void didReceivePolicyDecision(WebCore::PolicyAction action, uint64_t navigationID);
+    void didDestroyNavigation(uint64_t navigationID);
+
+    void didFailProvisionalLoadForFrame(uint64_t navigationID, const WebCore::ResourceError& error);
 
     void createInspectorTarget(const String& targetId, Inspector::InspectorTargetType);
     void destroyInspectorTarget(const String& targetId);
     void sendMessageToInspectorFrontend(const String& targetId, const String& message);
 
+    void setPauseOnStart(bool);
+
+    bool shouldPauseLoading() const;
+    void setContinueLoadingCallback(WTF::Function<void()>&&);
+
     bool shouldPauseLoading(const ProvisionalPageProxy&) const;
     void setContinueLoadingCallback(const ProvisionalPageProxy&, WTF::Function<void()>&&);
 
@@ -84,6 +146,7 @@ private:
     void createLazyAgents();
 
     void addTarget(std::unique_ptr<InspectorTargetProxy>&&);
+    void adjustPageSettings();
 
     Ref<Inspector::FrontendRouter> m_frontendRouter;
     Ref<Inspector::BackendDispatcher> m_backendDispatcher;
@@ -92,11 +155,17 @@ private:
     WebPageProxy& m_page;
 
     Inspector::InspectorTargetAgent* m_targetAgent { nullptr };
+    WebPageInspectorEmulationAgent* m_emulationAgent { nullptr };
+    WebPageInspectorInputAgent* m_inputAgent { nullptr };
+    InspectorScreencastAgent* m_screecastAgent { nullptr };
     HashMap<String, std::unique_ptr<InspectorTargetProxy>> m_targets;
 
     InspectorBrowserAgent* m_enabledBrowserAgent;
 
     bool m_didCreateLazyAgents { false };
+    HashMap<uint64_t, NavigationHandler> m_pendingNavigations;
+
+    static WebPageInspectorControllerObserver* s_observer;
 };
 
 } // namespace WebKit
diff --git a/Source/WebKit/UIProcess/Inspector/mac/ScreencastEncoderMac.mm b/Source/WebKit/UIProcess/Inspector/mac/ScreencastEncoderMac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..0700f3624b34ab536f4101a12ba5fbd9a81e9a58
--- /dev/null
+++ b/Source/WebKit/UIProcess/Inspector/mac/ScreencastEncoderMac.mm
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ScreencastEncoder.h"
+
+#include <algorithm>
+#include <CoreGraphics/CoreGraphics.h>
+#include <wtf/RetainPtr.h>
+
+namespace WebKit {
+
+void ScreencastEncoder::imageToARGB(CGImageRef image, uint8_t* argb_data, int width, int height, Optional<double> scale, int offsetTop)
+{
+    size_t bitsPerComponent = 8;
+    size_t bytesPerPixel = 4;
+    size_t bytesPerRow = bytesPerPixel * width;
+    RetainPtr<CGColorSpaceRef> colorSpace = adoptCF(CGColorSpaceCreateDeviceRGB());
+    RetainPtr<CGContextRef> context = adoptCF(CGBitmapContextCreate(argb_data, width, height, bitsPerComponent, bytesPerRow, colorSpace.get(), kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little));
+    double imageWidth = CGImageGetWidth(image);
+    double imageHeight = CGImageGetHeight(image);
+    // TODO: exclude controls from original screenshot
+    double pageHeight = imageHeight - offsetTop;
+    double ratio = 1;
+    if (scale) {
+        ratio = *scale;
+    } else if (imageWidth > width || pageHeight > height) {
+        ratio = std::min(width / imageWidth, height / pageHeight);
+    }
+    imageWidth *= ratio;
+    imageHeight *= ratio;
+    pageHeight *= ratio;
+    CGContextDrawImage(context.get(), CGRectMake(0, height - pageHeight, imageWidth, imageHeight), image);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/InspectorDialogAgent.cpp b/Source/WebKit/UIProcess/InspectorDialogAgent.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..663f92f0df76042cf6385b056f8a917d688259f9
--- /dev/null
+++ b/Source/WebKit/UIProcess/InspectorDialogAgent.cpp
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorDialogAgent.h"
+
+#include "APINavigation.h"
+#include "APIUIClient.h"
+#include "WebPageProxy.h"
+#include <JavaScriptCore/InspectorFrontendRouter.h>
+
+
+namespace WebKit {
+
+using namespace Inspector;
+
+InspectorDialogAgent::InspectorDialogAgent(Inspector::BackendDispatcher& backendDispatcher, Inspector::FrontendRouter& frontendRouter, WebPageProxy& page)
+    : InspectorAgentBase("Dialog"_s)
+    , m_frontendDispatcher(makeUnique<DialogFrontendDispatcher>(frontendRouter))
+    , m_backendDispatcher(DialogBackendDispatcher::create(backendDispatcher, this))
+    , m_page(page)
+{
+}
+
+InspectorDialogAgent::~InspectorDialogAgent()
+{
+    disable();
+}
+
+void InspectorDialogAgent::didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*)
+{
+}
+
+void InspectorDialogAgent::willDestroyFrontendAndBackend(Inspector::DisconnectReason)
+{
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorDialogAgent::enable()
+{
+    if (m_page.inspectorDialogAgent())
+        return makeUnexpected("Dialog domain is already enabled."_s);
+
+    m_page.setInspectorDialogAgent(this);
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorDialogAgent::disable()
+{
+    if (m_page.inspectorDialogAgent() != this)
+        return { };
+
+    m_page.setInspectorDialogAgent(nullptr);
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorDialogAgent::handleJavaScriptDialog(bool accept, const String& value)
+{
+    m_page.uiClient().handleJavaScriptDialog(m_page, accept, value);
+    return { };
+}
+
+void InspectorDialogAgent::javascriptDialogOpening(const String& type, const String& message, const String& defaultValue) {
+    m_frontendDispatcher->javascriptDialogOpening(type, message, defaultValue);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/InspectorDialogAgent.h b/Source/WebKit/UIProcess/InspectorDialogAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..d0e11ed81a6257c011df23d5870da7403f8e9fe4
--- /dev/null
+++ b/Source/WebKit/UIProcess/InspectorDialogAgent.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "WebEvent.h"
+
+#include <JavaScriptCore/InspectorAgentBase.h>
+#include <JavaScriptCore/InspectorBackendDispatchers.h>
+#include <JavaScriptCore/InspectorFrontendDispatchers.h>
+
+#include <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+
+namespace Inspector {
+class FrontendChannel;
+class FrontendRouter;
+}
+
+namespace WebKit {
+
+class NativeWebKeyboardEvent;
+class WebPageProxy;
+
+class InspectorDialogAgent : public Inspector::InspectorAgentBase, public Inspector::DialogBackendDispatcherHandler {
+    WTF_MAKE_NONCOPYABLE(InspectorDialogAgent);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    InspectorDialogAgent(Inspector::BackendDispatcher& backendDispatcher, Inspector::FrontendRouter& frontendRouter, WebPageProxy& page);
+    ~InspectorDialogAgent() override;
+
+    void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) override;
+    void willDestroyFrontendAndBackend(Inspector::DisconnectReason) override;
+
+    Inspector::Protocol::ErrorStringOr<void> enable() override;
+    Inspector::Protocol::ErrorStringOr<void> disable() override;
+    Inspector::Protocol::ErrorStringOr<void> handleJavaScriptDialog(bool accept, const String& promptText) override;
+
+    void javascriptDialogOpening(const String& type, const String& message, const String& defaultValue = String());
+
+private:
+    void platformHandleJavaScriptDialog(bool accept, const String* promptText);
+    std::unique_ptr<Inspector::DialogFrontendDispatcher> m_frontendDispatcher;
+    Ref<Inspector::DialogBackendDispatcher> m_backendDispatcher;
+    WebPageProxy& m_page;
+};
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/InspectorPlaywrightAgent.cpp b/Source/WebKit/UIProcess/InspectorPlaywrightAgent.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..04d06589d224df007a9a1c3b3ffcf3d56b1744a3
--- /dev/null
+++ b/Source/WebKit/UIProcess/InspectorPlaywrightAgent.cpp
@@ -0,0 +1,882 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorPlaywrightAgent.h"
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "APIPageConfiguration.h"
+#include "FrameInfoData.h"
+#include "InspectorPlaywrightAgentClient.h"
+#include "InspectorTargetProxy.h"
+#include "NetworkProcessMessages.h"
+#include "NetworkProcessProxy.h"
+#include "PageClient.h"
+#include "WebAutomationSession.h"
+#include "WebGeolocationManagerProxy.h"
+#include "WebGeolocationPosition.h"
+#include "WebInspectorUtilities.h"
+#include "WebPageInspectorController.h"
+#include "WebPageInspectorTarget.h"
+#include "WebPageProxy.h"
+#include "WebProcessPool.h"
+#include "WebProcessProxy.h"
+#include <WebCore/FrameIdentifier.h>
+#include <WebCore/GeolocationPositionData.h>
+#include <WebCore/InspectorPageAgent.h>
+#include <WebCore/ProcessIdentifier.h>
+#include <WebCore/ResourceRequest.h>
+#include <WebCore/WindowFeatures.h>
+#include <JavaScriptCore/InspectorBackendDispatcher.h>
+#include <JavaScriptCore/InspectorFrontendChannel.h>
+#include <JavaScriptCore/InspectorFrontendRouter.h>
+#include <pal/SessionID.h>
+#include <stdlib.h>
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/HexNumber.h>
+#include <wtf/URL.h>
+
+
+using namespace Inspector;
+
+namespace WebKit {
+
+class InspectorPlaywrightAgent::PageProxyChannel : public FrontendChannel {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    PageProxyChannel(FrontendChannel& frontendChannel, String browserContextID, String pageProxyID, WebPageProxy& page)
+        : m_browserContextID(browserContextID)
+        , m_pageProxyID(pageProxyID)
+        , m_frontendChannel(frontendChannel)
+        , m_page(page)
+    {
+    }
+
+    ~PageProxyChannel() override = default;
+
+    void dispatchMessageFromFrontend(const String& message)
+    {
+        m_page.inspectorController().dispatchMessageFromFrontend(message);
+    }
+
+    WebPageProxy& page() { return m_page; }
+
+    void disconnect()
+    {
+        m_page.inspectorController().disconnectFrontend(*this);
+    }
+
+private:
+    ConnectionType connectionType() const override { return m_frontendChannel.connectionType(); }
+    void sendMessageToFrontend(const String& message) override
+    {
+        m_frontendChannel.sendMessageToFrontend(addTabIdToMessage(message));
+    }
+
+    String addTabIdToMessage(const String& message) {
+        RefPtr<JSON::Value> parsedMessage = JSON::Value::parseJSON(message);
+        if (!parsedMessage)
+            return message;
+
+        RefPtr<JSON::Object> messageObject = parsedMessage->asObject();
+        if (!messageObject)
+            return message;
+
+        messageObject->setString("browserContextId"_s, m_browserContextID);
+        messageObject->setString("pageProxyId"_s, m_pageProxyID);
+        return messageObject->toJSONString();
+    }
+
+    String m_browserContextID;
+    String m_pageProxyID;
+    FrontendChannel& m_frontendChannel;
+    WebPageProxy& m_page;
+};
+
+namespace {
+
+String toBrowserContextIDProtocolString(const PAL::SessionID& sessionID)
+{
+    StringBuilder builder;
+    builder.append(hex(sessionID.toUInt64(), 16));
+    return builder.toString();
+}
+
+String toPageProxyIDProtocolString(const WebPageProxy& page)
+{
+    return makeString(page.identifier().toUInt64());
+}
+
+
+static Ref<JSON::ArrayOf<String>> getEnabledWindowFeatures(const WebCore::WindowFeatures& features) {
+  auto result = JSON::ArrayOf<String>::create();
+  if (features.x)
+    result->addItem("left=" + String::number(*features.x));
+  if (features.y)
+    result->addItem("top=" + String::number(*features.y));
+  if (features.width)
+    result->addItem("width=" + String::number(*features.width));
+  if (features.height)
+    result->addItem("height=" + String::number(*features.height));
+  if (features.menuBarVisible)
+    result->addItem("menubar");
+  if (features.toolBarVisible)
+    result->addItem("toolbar");
+  if (features.statusBarVisible)
+    result->addItem("status");
+  if (features.locationBarVisible)
+    result->addItem("location");
+  if (features.scrollbarsVisible)
+    result->addItem("scrollbars");
+  if (features.resizable)
+    result->addItem("resizable");
+  if (features.fullscreen)
+    result->addItem("fullscreen");
+  if (features.dialog)
+    result->addItem("dialog");
+  if (features.noopener)
+    result->addItem("noopener");
+  if (features.noreferrer)
+    result->addItem("noreferrer");
+  for (const auto& additionalFeature : features.additionalFeatures)
+    result->addItem(additionalFeature);
+  return result;
+}
+
+Inspector::Protocol::Playwright::CookieSameSitePolicy cookieSameSitePolicy(WebCore::Cookie::SameSitePolicy policy)
+{
+    switch (policy) {
+    case WebCore::Cookie::SameSitePolicy::None:
+        return Inspector::Protocol::Playwright::CookieSameSitePolicy::None;
+    case WebCore::Cookie::SameSitePolicy::Lax:
+        return Inspector::Protocol::Playwright::CookieSameSitePolicy::Lax;
+    case WebCore::Cookie::SameSitePolicy::Strict:
+        return Inspector::Protocol::Playwright::CookieSameSitePolicy::Strict;
+    }
+    ASSERT_NOT_REACHED();
+    return Inspector::Protocol::Playwright::CookieSameSitePolicy::None;
+}
+
+Ref<Inspector::Protocol::Playwright::Cookie> buildObjectForCookie(const WebCore::Cookie& cookie)
+{
+    return Inspector::Protocol::Playwright::Cookie::create()
+        .setName(cookie.name)
+        .setValue(cookie.value)
+        .setDomain(cookie.domain)
+        .setPath(cookie.path)
+        .setExpires(cookie.expires.valueOr(-1))
+        .setHttpOnly(cookie.httpOnly)
+        .setSecure(cookie.secure)
+        .setSession(cookie.session)
+        .setSameSite(cookieSameSitePolicy(cookie.sameSite))
+        .release();
+}
+
+}  // namespace
+
+BrowserContext::BrowserContext() = default;
+
+BrowserContext::~BrowserContext() = default;
+
+class InspectorPlaywrightAgent::BrowserContextDeletion {
+    WTF_MAKE_NONCOPYABLE(BrowserContextDeletion);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    BrowserContextDeletion(std::unique_ptr<BrowserContext>&& context, size_t numberOfPages, Ref<DeleteContextCallback>&& callback)
+        : m_browserContext(WTFMove(context))
+        , m_numberOfPages(numberOfPages)
+        , m_callback(WTFMove(callback)) { }
+
+    void didDestroyPage(const WebPageProxy& page)
+    {
+        ASSERT(m_browserContext->dataStore->sessionID() == page.sessionID());
+        // Check if new pages have been created during the context destruction and
+        // close all of them if necessary.
+        if (m_numberOfPages == 1) {
+            auto pages = m_browserContext->pages;
+            size_t numberOfPages = pages.size();
+            if (numberOfPages > 1) {
+                m_numberOfPages = numberOfPages;
+                for (auto* existingPage : pages) {
+                    if (existingPage != &page)
+                        existingPage->closePage();
+                }
+            }
+        }
+        --m_numberOfPages;
+        if (m_numberOfPages)
+            return;
+        m_callback->sendSuccess();
+    }
+
+    bool isFinished() const { return !m_numberOfPages; }
+
+    BrowserContext* context() const { return m_browserContext.get(); }
+
+private:
+    std::unique_ptr<BrowserContext> m_browserContext;
+    size_t m_numberOfPages;
+    Ref<DeleteContextCallback> m_callback;
+};
+
+
+InspectorPlaywrightAgent::InspectorPlaywrightAgent(std::unique_ptr<InspectorPlaywrightAgentClient> client)
+    : m_frontendChannel(nullptr)
+    , m_frontendRouter(FrontendRouter::create())
+    , m_backendDispatcher(BackendDispatcher::create(m_frontendRouter.copyRef()))
+    , m_client(std::move(client))
+    , m_frontendDispatcher(makeUnique<PlaywrightFrontendDispatcher>(m_frontendRouter))
+    , m_playwrightDispatcher(PlaywrightBackendDispatcher::create(m_backendDispatcher.get(), this))
+{
+}
+
+InspectorPlaywrightAgent::~InspectorPlaywrightAgent()
+{
+    if (m_frontendChannel)
+        disconnectFrontend();
+}
+
+void InspectorPlaywrightAgent::connectFrontend(FrontendChannel& frontendChannel)
+{
+    ASSERT(!m_frontendChannel);
+    m_frontendChannel = &frontendChannel;
+    WebPageInspectorController::setObserver(this);
+
+    m_frontendRouter->connectFrontend(frontendChannel);
+}
+
+void InspectorPlaywrightAgent::disconnectFrontend()
+{
+    ASSERT(m_frontendChannel);
+
+    disable();
+
+    m_frontendRouter->disconnectFrontend(*m_frontendChannel);
+    ASSERT(!m_frontendRouter->hasFrontends());
+
+    WebPageInspectorController::setObserver(nullptr);
+    m_frontendChannel = nullptr;
+}
+
+void InspectorPlaywrightAgent::dispatchMessageFromFrontend(const String& message)
+{
+    m_backendDispatcher->dispatch(message, [&](const RefPtr<JSON::Object>& messageObject) {
+        RefPtr<JSON::Value> idValue;
+        if (!messageObject->getValue("id"_s, idValue))
+            return BackendDispatcher::InterceptionResult::Continue;
+        RefPtr<JSON::Value> pageProxyIDValue;
+        if (!messageObject->getValue("pageProxyId"_s, pageProxyIDValue))
+            return BackendDispatcher::InterceptionResult::Continue;
+
+        String pageProxyID;
+        if (!pageProxyIDValue->asString(pageProxyID)) {
+            m_backendDispatcher->reportProtocolError(BackendDispatcher::InvalidRequest, "The type of 'pageProxyId' must be string"_s);
+            m_backendDispatcher->sendPendingErrors();
+            return BackendDispatcher::InterceptionResult::Intercepted;
+        }
+
+        if (auto pageProxyChannel = m_pageProxyChannels.get(pageProxyID)) {
+            pageProxyChannel->dispatchMessageFromFrontend(message);
+            return BackendDispatcher::InterceptionResult::Intercepted;
+        }
+
+        Optional<int> requestId = idValue->asInteger();
+        if (!requestId) {
+            m_backendDispatcher->reportProtocolError(BackendDispatcher::InvalidRequest, "The type of 'id' must be number"_s);
+            m_backendDispatcher->sendPendingErrors();
+            return BackendDispatcher::InterceptionResult::Intercepted;
+        }
+
+        m_backendDispatcher->reportProtocolError(*requestId, BackendDispatcher::InvalidParams, "Cannot find page proxy with provided 'pageProxyId'"_s);
+        m_backendDispatcher->sendPendingErrors();
+        return BackendDispatcher::InterceptionResult::Intercepted;
+    });
+}
+
+void InspectorPlaywrightAgent::didCreateInspectorController(WebPageProxy& page)
+{
+    if (!m_isEnabled)
+        return;
+
+    if (isInspectorProcessPool(page.process().processPool()))
+        return;
+
+    ASSERT(m_frontendChannel);
+
+    String browserContextID = toBrowserContextIDProtocolString(page.sessionID());
+    String pageProxyID = toPageProxyIDProtocolString(page);
+    auto* opener = page.configuration().relatedPage();
+    String openerId;
+    if (opener)
+        openerId = toPageProxyIDProtocolString(*opener);
+
+    BrowserContext* browserContext = getExistingBrowserContext(browserContextID);
+    browserContext->pages.add(&page);
+    m_frontendDispatcher->pageProxyCreated(browserContextID, pageProxyID, openerId);
+
+    // Auto-connect to all new pages.
+    auto pageProxyChannel = makeUnique<PageProxyChannel>(*m_frontendChannel, browserContextID, pageProxyID, page);
+    page.inspectorController().connectFrontend(*pageProxyChannel);
+    // Always pause new targets if controlled remotely.
+    page.inspectorController().setPauseOnStart(true);
+    m_pageProxyChannels.set(pageProxyID, WTFMove(pageProxyChannel));
+}
+
+void InspectorPlaywrightAgent::willDestroyInspectorController(WebPageProxy& page)
+{
+    if (!m_isEnabled)
+        return;
+
+    if (isInspectorProcessPool(page.process().processPool()))
+        return;
+
+    String browserContextID = toBrowserContextIDProtocolString(page.sessionID());
+    BrowserContext* browserContext = getExistingBrowserContext(browserContextID);
+    browserContext->pages.remove(&page);
+    m_frontendDispatcher->pageProxyDestroyed(toPageProxyIDProtocolString(page));
+
+    auto it = m_browserContextDeletions.find(browserContextID);
+    if (it != m_browserContextDeletions.end()) {
+        it->value->didDestroyPage(page);
+        if (it->value->isFinished())
+            m_browserContextDeletions.remove(it);
+    }
+
+    String pageProxyID = toPageProxyIDProtocolString(page);
+    auto channelIt = m_pageProxyChannels.find(pageProxyID);
+    ASSERT(channelIt != m_pageProxyChannels.end());
+    channelIt->value->disconnect();
+    m_pageProxyChannels.remove(channelIt);
+}
+
+void InspectorPlaywrightAgent::didFailProvisionalLoad(WebPageProxy& page, uint64_t navigationID, const String& error)
+{
+    if (!m_isEnabled)
+        return;
+
+    m_frontendDispatcher->provisionalLoadFailed(
+        toPageProxyIDProtocolString(page),
+        String::number(navigationID), error);
+}
+
+void InspectorPlaywrightAgent::willCreateNewPage(WebPageProxy& page, const WebCore::WindowFeatures& features, const URL& url)
+{
+    if (!m_isEnabled)
+        return;
+
+    m_frontendDispatcher->windowOpen(
+        toPageProxyIDProtocolString(page),
+        url.string(),
+        getEnabledWindowFeatures(features));
+}
+
+void InspectorPlaywrightAgent::didFinishScreencast(const PAL::SessionID& sessionID, const String& screencastID)
+{
+    if (!m_isEnabled)
+        return;
+
+    m_frontendDispatcher->screencastFinished(screencastID);
+}
+
+static WebsiteDataStore* findDefaultWebsiteDataStore() {
+    WebsiteDataStore* result = nullptr;
+    WebsiteDataStore::forEachWebsiteDataStore([&result] (WebsiteDataStore& dataStore) {
+        if (dataStore.isPersistent()) {
+            RELEASE_ASSERT(result == nullptr);
+            result = &dataStore;
+        }
+    });
+    return result;
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorPlaywrightAgent::enable()
+{
+    if (m_isEnabled)
+        return { };
+
+    m_isEnabled = true;
+
+    auto* defaultDataStore = findDefaultWebsiteDataStore();
+    if (!m_defaultContext && defaultDataStore) {
+        auto context = std::make_unique<BrowserContext>();
+        m_defaultContext = context.get();
+        context->processPool = WebProcessPool::allProcessPools().first();
+        context->dataStore = defaultDataStore;
+        // Add default context to the map so that we can easily find it for
+        // created/deleted pages.
+        PAL::SessionID sessionID = context->dataStore->sessionID();
+        m_browserContexts.set(toBrowserContextIDProtocolString(sessionID), WTFMove(context));
+    }
+
+    WebsiteDataStore::forEachWebsiteDataStore([this] (WebsiteDataStore& dataStore) {
+        dataStore.setDownloadInstrumentation(this);
+    });
+    for (auto& pool : WebProcessPool::allProcessPools()) {
+        for (auto& process : pool->processes()) {
+            for (auto* page : process->pages())
+                didCreateInspectorController(*page);
+        }
+    }
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorPlaywrightAgent::disable()
+{
+    if (!m_isEnabled)
+        return { };
+
+    m_isEnabled = false;
+
+    for (auto it = m_pageProxyChannels.begin(); it != m_pageProxyChannels.end(); ++it)
+        it->value->disconnect();
+    m_pageProxyChannels.clear();
+
+    WebsiteDataStore::forEachWebsiteDataStore([] (WebsiteDataStore& dataStore) {
+        dataStore.setDownloadInstrumentation(nullptr);
+        dataStore.setDownloadForAutomation(Optional<bool>(), String());
+    });
+    for (auto& it : m_browserContexts) {
+        it.value->dataStore->setDownloadInstrumentation(nullptr);
+        it.value->pages.clear();
+    }
+    m_browserContextDeletions.clear();
+    return { };
+}
+
+void InspectorPlaywrightAgent::close(Ref<CloseCallback>&& callback)
+{
+    Vector<WebPageProxy*> pages;
+    // If Web Process crashed it will be disconnected from its pool until
+    // the page reloads. So we cannot discover such processes and the pages
+    // by traversing all process pools and their processes. Instead we look at
+    // all existing Web Processes wether in a pool or not.
+    for (auto* process : WebProcessProxy::allProcessesForInspector()) {
+        for (auto* page : process->pages())
+            pages.append(page);
+    }
+    for (auto* page : pages)
+        page->closePage();
+
+    if (!WebProcessPool::allProcessPools().size()) {
+        m_client->closeBrowser();
+        callback->sendSuccess();
+        return;
+    }
+
+    if (!m_defaultContext) {
+        m_client->closeBrowser();
+        callback->sendSuccess();
+        return;
+    }
+
+    m_defaultContext->dataStore->syncLocalStorage([this, callback = WTFMove(callback)] () {
+        if (!callback->isActive())
+            return;
+
+        if (m_client == nullptr) {
+            callback->sendFailure("no platform delegate to close browser");
+        } else {
+            m_client->closeBrowser();
+            callback->sendSuccess();
+        }
+    });
+
+}
+
+Inspector::Protocol::ErrorStringOr<String /* browserContextID */> InspectorPlaywrightAgent::createContext(const String& proxyServer, const String& proxyBypassList)
+{
+    String errorString;
+    std::unique_ptr<BrowserContext> browserContext = m_client->createBrowserContext(errorString, proxyServer, proxyBypassList);
+    if (!browserContext)
+        return makeUnexpected(errorString);
+
+    // Ensure network process.
+    browserContext->dataStore->networkProcess();
+    browserContext->dataStore->setDownloadInstrumentation(this);
+
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+    String browserContextID = toBrowserContextIDProtocolString(sessionID);
+    m_browserContexts.set(browserContextID, WTFMove(browserContext));
+    return browserContextID;
+}
+
+void InspectorPlaywrightAgent::deleteContext(const String& browserContextID, Ref<DeleteContextCallback>&& callback)
+{
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!lookupBrowserContext(errorString, browserContextID)) {
+        callback->sendFailure(errorString);
+        return;
+    }
+
+    if (browserContext == m_defaultContext) {
+        callback->sendFailure("Cannot delete default context"_s);
+        return;
+    }
+
+    auto pages = browserContext->pages;
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+    auto contextHolder = m_browserContexts.take(browserContextID);
+    if (pages.isEmpty()) {
+        callback->sendSuccess();
+    } else {
+        m_browserContextDeletions.set(browserContextID, makeUnique<BrowserContextDeletion>(WTFMove(contextHolder), pages.size(), WTFMove(callback)));
+        for (auto* page : pages)
+            page->closePage();
+    }
+    m_client->deleteBrowserContext(errorString, sessionID);
+}
+
+Inspector::Protocol::ErrorStringOr<String /* pageProxyID */> InspectorPlaywrightAgent::createPage(const String& browserContextID)
+{
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!browserContext)
+        return makeUnexpected(errorString);
+
+    RefPtr<WebPageProxy> page = m_client->createPage(errorString, *browserContext);
+    if (!page)
+        return makeUnexpected(errorString);
+
+    return toPageProxyIDProtocolString(*page);
+}
+
+WebFrameProxy* InspectorPlaywrightAgent::frameForID(const String& frameID, String& error)
+{
+    size_t dotPos = frameID.find(".");
+    if (dotPos == notFound) {
+        error = "Invalid frame id"_s;
+        return nullptr;
+    }
+
+    if (!frameID.isAllASCII()) {
+        error = "Invalid frame id"_s;
+        return nullptr;
+    }
+
+    String processIDString = frameID.left(dotPos);
+    uint64_t pid = strtoull(processIDString.ascii().data(), 0, 10);
+    auto processID = makeObjectIdentifier<WebCore::ProcessIdentifierType>(pid);
+    WebProcessProxy* process = WebProcessProxy::processForIdentifier(processID);
+    if (!process) {
+        error = "Cannot find web process for the frame id"_s;
+        return nullptr;
+    }
+
+    String frameIDString = frameID.substring(dotPos + 1);
+    uint64_t frameIDNumber = strtoull(frameIDString.ascii().data(), 0, 10);
+    auto frameIdentifier = makeObjectIdentifier<WebCore::FrameIdentifierType>(frameIDNumber);
+    WebFrameProxy* frame = process->webFrame(frameIdentifier);
+    if (!frame) {
+        error = "Cannot find web frame for the frame id"_s;
+        return nullptr;
+    }
+
+    return frame;
+}
+
+void InspectorPlaywrightAgent::navigate(const String& url, const String& pageProxyID, const String& frameID, const String& referrer, Ref<NavigateCallback>&& callback)
+{
+    auto* pageProxyChannel = m_pageProxyChannels.get(pageProxyID);
+    if (!pageProxyChannel) {
+        callback->sendFailure("Cannot find page proxy with provided 'pageProxyId'"_s);
+        return;
+    }
+
+    WebCore::ResourceRequest resourceRequest { url };
+
+    if (!!referrer)
+        resourceRequest.setHTTPReferrer(referrer);
+
+    if (!resourceRequest.url().isValid()) {
+        callback->sendFailure("Cannot navigate to invalid URL"_s);
+        return;
+    }
+
+    WebFrameProxy* frame = nullptr;
+    if (!!frameID) {
+        String error;
+        frame = frameForID(frameID, error);
+        if (!frame) {
+            callback->sendFailure(error);
+            return;
+        }
+
+        if (frame->page() != &pageProxyChannel->page()) {
+            callback->sendFailure("Frame with specified is not from the specified page"_s);
+            return;
+        }
+    }
+
+    pageProxyChannel->page().inspectorController().navigate(WTFMove(resourceRequest), frame, [callback = WTFMove(callback)](const String& error, uint64_t navigationID) {
+        if (!error.isEmpty()) {
+            callback->sendFailure(error);
+            return;
+        }
+
+        String navigationIDString;
+        if (navigationID)
+            navigationIDString = String::number(navigationID);
+        callback->sendSuccess(navigationIDString);
+    });
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorPlaywrightAgent::setIgnoreCertificateErrors(const String& browserContextID, bool ignore)
+{
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+    NetworkProcessProxy& networkProcess = browserContext->dataStore->networkProcess();
+    networkProcess.send(Messages::NetworkProcess::SetIgnoreCertificateErrors(sessionID, ignore), 0);
+    return { };
+}
+
+void InspectorPlaywrightAgent::getAllCookies(const String& browserContextID, Ref<GetAllCookiesCallback>&& callback) {
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty()) {
+        callback->sendFailure(errorString);
+        return;
+    }
+
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+    NetworkProcessProxy& networkProcess = browserContext->dataStore->networkProcess();
+    networkProcess.sendWithAsyncReply(Messages::NetworkProcess::GetAllCookies(sessionID),
+        [callback = WTFMove(callback)](Vector<WebCore::Cookie> allCookies) {
+            if (!callback->isActive())
+                return;
+            auto cookies = JSON::ArrayOf<Inspector::Protocol::Playwright::Cookie>::create();
+            for (const auto& cookie : allCookies)
+                cookies->addItem(buildObjectForCookie(cookie));
+            callback->sendSuccess(WTFMove(cookies));
+        }, 0);
+}
+
+void InspectorPlaywrightAgent::setCookies(const String& browserContextID, Ref<JSON::Array>&& in_cookies, Ref<SetCookiesCallback>&& callback) {
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty()) {
+        callback->sendFailure(errorString);
+        return;
+    }
+
+    NetworkProcessProxy& networkProcess = browserContext->dataStore->networkProcess();
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+
+    Vector<WebCore::Cookie> cookies;
+    for (unsigned i = 0; i < in_cookies->length(); ++i) {
+        RefPtr<JSON::Value> item = in_cookies->get(i);
+        RefPtr<JSON::Object> obj = item->asObject();
+        if (!obj) {
+            callback->sendFailure("Invalid cookie payload format"_s);
+            return;
+        }
+
+        WebCore::Cookie cookie;
+        cookie.name = obj->getString("name");
+        cookie.value = obj->getString("value");
+        cookie.domain = obj->getString("domain");
+        cookie.path = obj->getString("path");
+        if (!cookie.name || !cookie.value || !cookie.domain || !cookie.path) {
+            callback->sendFailure("Invalid file payload format"_s);
+            return;
+        }
+
+        Optional<double> expires = obj->getDouble("expires");
+        if (expires && *expires != -1)
+            cookie.expires = *expires;
+        if (Optional<bool> value = obj->getBoolean("httpOnly"))
+            cookie.httpOnly = *value;
+        if (Optional<bool> value = obj->getBoolean("secure"))
+            cookie.secure = *value;
+        if (Optional<bool> value = obj->getBoolean("session"))
+            cookie.session = *value;
+        String sameSite;
+        if (obj->getString("sameSite", sameSite)) {
+            if (sameSite == "None")
+                cookie.sameSite = WebCore::Cookie::SameSitePolicy::None;
+            if (sameSite == "Lax")
+                cookie.sameSite = WebCore::Cookie::SameSitePolicy::Lax;
+            if (sameSite == "Strict")
+                cookie.sameSite = WebCore::Cookie::SameSitePolicy::Strict;
+        }
+        cookies.append(WTFMove(cookie));
+    }
+
+    networkProcess.sendWithAsyncReply(Messages::NetworkProcess::SetCookies(sessionID, WTFMove(cookies)),
+        [callback = WTFMove(callback)](bool success) {
+            if (!callback->isActive())
+                return;
+
+            if (success)
+                callback->sendSuccess();
+            else
+                callback->sendFailure("Internal error: no network storage"_s);
+            callback->sendSuccess();
+        }, 0);
+}
+
+void InspectorPlaywrightAgent::deleteAllCookies(const String& browserContextID, Ref<DeleteAllCookiesCallback>&& callback) {
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty()) {
+        callback->sendFailure(errorString);
+        return;
+    }
+
+    NetworkProcessProxy& networkProcess = browserContext->dataStore->networkProcess();
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+    networkProcess.sendWithAsyncReply(Messages::NetworkProcess::DeleteAllCookies(sessionID),
+        [callback = WTFMove(callback)](bool success) {
+            if (!callback->isActive())
+                return;
+            if (success)
+                callback->sendSuccess();
+            else
+                callback->sendFailure("Internal error: no network storage"_s);
+        }, 0);
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorPlaywrightAgent::setLanguages(Ref<JSON::Array>&& languages, const String& browserContextID)
+{
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    Vector<String> items;
+    for (const auto& value : languages.get()) {
+        String language;
+        if (!value->asString(language))
+            return makeUnexpected("Language must be a string"_s);
+
+        items.append(language);
+    }
+
+    browserContext->dataStore->setLanguagesForAutomation(WTFMove(items));
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorPlaywrightAgent::setDownloadBehavior(const String& behavior, const String& downloadPath, const String& browserContextID)
+{
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    Optional<bool> allow;
+    if (behavior == "allow"_s)
+      allow = true;
+    if (behavior == "deny"_s)
+      allow = false;
+    browserContext->dataStore->setDownloadForAutomation(allow, downloadPath);
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> InspectorPlaywrightAgent::setGeolocationOverride(const String& browserContextID, RefPtr<JSON::Object>&& geolocation)
+{
+    String errorString;
+    BrowserContext* browserContext = lookupBrowserContext(errorString, browserContextID);
+    if (!errorString.isEmpty())
+        return makeUnexpected(errorString);
+
+    auto* geoManager = browserContext->processPool->supplement<WebGeolocationManagerProxy>();
+    if (!geoManager)
+        return makeUnexpected("Internal error: geolocation manager is not available."_s);
+
+    if (geolocation) {
+        Optional<double> timestamp = geolocation->getDouble("timestamp");
+        Optional<double> latitude = geolocation->getDouble("latitude");
+        Optional<double> longitude = geolocation->getDouble("longitude");
+        Optional<double> accuracy = geolocation->getDouble("accuracy");
+        if (!timestamp || !latitude || !longitude || !accuracy)
+            return makeUnexpected("Invalid geolocation format"_s);
+
+        auto position = WebGeolocationPosition::create(WebCore::GeolocationPositionData(*timestamp, *latitude, *longitude, *accuracy));
+        geoManager->providerDidChangePosition(&position.get());
+    } else {
+        geoManager->providerDidFailToDeterminePosition("Position unavailable"_s);
+    }
+    return { };
+}
+
+void InspectorPlaywrightAgent::downloadCreated(const String& uuid, const WebCore::ResourceRequest& request, const FrameInfoData& frameInfoData, WebPageProxy* page)
+{
+    if (!m_isEnabled)
+        return;
+    String frameID = WebCore::InspectorPageAgent::makeFrameID(page->process().coreProcessIdentifier(), frameInfoData.frameID ? *frameInfoData.frameID : page->mainFrame()->frameID());
+    m_frontendDispatcher->downloadCreated(
+        toPageProxyIDProtocolString(*page),
+        frameID,
+        uuid, request.url().string());
+}
+
+void InspectorPlaywrightAgent::downloadFilenameSuggested(const String& uuid, const String& suggestedFilename)
+{
+    if (!m_isEnabled)
+        return;
+    m_frontendDispatcher->downloadFilenameSuggested(uuid, suggestedFilename);
+}
+
+void InspectorPlaywrightAgent::downloadFinished(const String& uuid, const String& error)
+{
+    if (!m_isEnabled)
+        return;
+    m_frontendDispatcher->downloadFinished(uuid, error);
+}
+
+BrowserContext* InspectorPlaywrightAgent::getExistingBrowserContext(const String& browserContextID)
+{
+    BrowserContext* browserContext = m_browserContexts.get(browserContextID);
+    if (browserContext)
+        return browserContext;
+
+    auto it = m_browserContextDeletions.find(browserContextID);
+    RELEASE_ASSERT(it != m_browserContextDeletions.end());
+    return it->value->context();
+}
+
+BrowserContext* InspectorPlaywrightAgent::lookupBrowserContext(ErrorString& errorString, const String& browserContextID)
+{
+    if (!browserContextID) {
+        if (!m_defaultContext)
+            errorString = "Browser started with no default context"_s;
+        return m_defaultContext;
+    }
+
+    BrowserContext* browserContext = m_browserContexts.get(browserContextID);
+    if (!browserContext)
+        errorString = "Could not find browser context for given id"_s;
+    return browserContext;
+}
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/InspectorPlaywrightAgent.h b/Source/WebKit/UIProcess/InspectorPlaywrightAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..0b6cd5c9357c90ac81c0c2d197699855062926af
--- /dev/null
+++ b/Source/WebKit/UIProcess/InspectorPlaywrightAgent.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorPlaywrightAgentClient.h"
+#include <JavaScriptCore/InspectorBackendDispatchers.h>
+#include "WebPageInspectorController.h"
+#include "WebProcessPool.h"
+#include <wtf/HashMap.h>
+#include <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+
+namespace Inspector {
+class BackendDispatcher;
+class FrontendChannel;
+class FrontendRouter;
+class PlaywrightFrontendDispatcher;
+}
+
+namespace PAL {
+class SessionID;
+}
+
+namespace WebKit {
+
+class WebFrameProxy;
+
+class InspectorPlaywrightAgent final
+    : public WebPageInspectorControllerObserver
+    , public Inspector::PlaywrightBackendDispatcherHandler
+    , public DownloadInstrumentation {
+    WTF_MAKE_NONCOPYABLE(InspectorPlaywrightAgent);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    explicit InspectorPlaywrightAgent(std::unique_ptr<InspectorPlaywrightAgentClient> client);
+    ~InspectorPlaywrightAgent() override;
+
+    // Transport
+    void connectFrontend(Inspector::FrontendChannel&);
+    void disconnectFrontend();
+    void dispatchMessageFromFrontend(const String& message);
+
+private:
+    class BrowserContextDeletion;
+    class PageProxyChannel;
+    class TargetHandler;
+
+    // WebPageInspectorControllerObserver
+    void didCreateInspectorController(WebPageProxy&) override;
+    void willDestroyInspectorController(WebPageProxy&) override;
+    void didFailProvisionalLoad(WebPageProxy&, uint64_t navigationID, const String& error) override;
+    void willCreateNewPage(WebPageProxy&, const WebCore::WindowFeatures&, const URL&) override;
+    void didFinishScreencast(const PAL::SessionID& sessionID, const String& screencastID) override;
+
+    // PlaywrightDispatcherHandler
+    Inspector::Protocol::ErrorStringOr<void> enable() override;
+    Inspector::Protocol::ErrorStringOr<void> disable() override;
+    void close(Ref<CloseCallback>&&) override;
+    Inspector::Protocol::ErrorStringOr<String /* browserContextID */> createContext(const String& proxyServer, const String& proxyBypassList) override;
+    void deleteContext(const String& browserContextID, Ref<DeleteContextCallback>&& callback) override;
+    Inspector::Protocol::ErrorStringOr<String /* pageProxyID */> createPage(const String& browserContextID) override;
+    void navigate(const String& url, const String& pageProxyID, const String& frameId, const String& referrer, Ref<NavigateCallback>&&) override;
+    Inspector::Protocol::ErrorStringOr<void> setIgnoreCertificateErrors(const String& browserContextID, bool ignore) override;
+
+    void getAllCookies(const String& browserContextID, Ref<GetAllCookiesCallback>&&) override;
+    void setCookies(const String& browserContextID, Ref<JSON::Array>&& in_cookies, Ref<SetCookiesCallback>&&) override;
+    void deleteAllCookies(const String& browserContextID, Ref<DeleteAllCookiesCallback>&&) override;
+
+    Inspector::Protocol::ErrorStringOr<void> setGeolocationOverride(const String& browserContextID, RefPtr<JSON::Object>&& geolocation) override;
+    Inspector::Protocol::ErrorStringOr<void> setLanguages(Ref<JSON::Array>&& languages, const String& browserContextID) override;
+    Inspector::Protocol::ErrorStringOr<void> setDownloadBehavior(const String& behavior, const String& downloadPath, const String& browserContextID) override;
+
+    // DownloadInstrumentation
+    void downloadCreated(const String& uuid, const WebCore::ResourceRequest&, const FrameInfoData& frameInfoData, WebPageProxy* page) override;
+    void downloadFilenameSuggested(const String& uuid, const String& suggestedFilename) override;
+    void downloadFinished(const String& uuid, const String& error) override;
+
+    BrowserContext* getExistingBrowserContext(const String& browserContextID);
+    BrowserContext* lookupBrowserContext(Inspector::ErrorString&, const String& browserContextID);
+    WebFrameProxy* frameForID(const String& frameID, String& error);
+
+    Inspector::FrontendChannel* m_frontendChannel { nullptr };
+    Ref<Inspector::FrontendRouter> m_frontendRouter;
+    Ref<Inspector::BackendDispatcher> m_backendDispatcher;
+    std::unique_ptr<InspectorPlaywrightAgentClient> m_client;
+    std::unique_ptr<Inspector::PlaywrightFrontendDispatcher> m_frontendDispatcher;
+    Ref<Inspector::PlaywrightBackendDispatcher> m_playwrightDispatcher;
+    HashMap<String, std::unique_ptr<PageProxyChannel>> m_pageProxyChannels;
+    BrowserContext* m_defaultContext;
+    HashMap<String, std::unique_ptr<BrowserContext>> m_browserContexts;
+    HashMap<String, std::unique_ptr<BrowserContextDeletion>> m_browserContextDeletions;
+    bool m_isEnabled { false };
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/InspectorPlaywrightAgentClient.h b/Source/WebKit/UIProcess/InspectorPlaywrightAgentClient.h
new file mode 100644
index 0000000000000000000000000000000000000000..11c8eadafca764aa549cb27c24967e15e6975774
--- /dev/null
+++ b/Source/WebKit/UIProcess/InspectorPlaywrightAgentClient.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include <memory>
+#include <pal/SessionID.h>
+#include <wtf/Forward.h>
+#include <wtf/HashSet.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/RefCounted.h>
+
+namespace WebKit {
+
+class WebsiteDataStore;
+class WebPageProxy;
+class WebProcessPool;
+
+class BrowserContext {
+    WTF_MAKE_NONCOPYABLE(BrowserContext);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    BrowserContext();
+    ~BrowserContext();
+
+    RefPtr<WebsiteDataStore> dataStore;
+    RefPtr<WebProcessPool> processPool;
+    HashSet<WebPageProxy*> pages;
+};
+
+class InspectorPlaywrightAgentClient {
+public:
+    virtual ~InspectorPlaywrightAgentClient() = default;
+    virtual RefPtr<WebKit::WebPageProxy> createPage(WTF::String& error, const BrowserContext& context) = 0;
+    virtual void closeBrowser() = 0;
+    virtual std::unique_ptr<BrowserContext> createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList) = 0;
+    virtual void deleteBrowserContext(WTF::String& error, PAL::SessionID) = 0;
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/Launcher/win/ProcessLauncherWin.cpp b/Source/WebKit/UIProcess/Launcher/win/ProcessLauncherWin.cpp
index 7a14cfba15c103a2d4fe263fa49d25af3c396ec2..3ee0e154349661632799057c71f1d1f1551c2d69 100644
--- a/Source/WebKit/UIProcess/Launcher/win/ProcessLauncherWin.cpp
+++ b/Source/WebKit/UIProcess/Launcher/win/ProcessLauncherWin.cpp
@@ -96,8 +96,11 @@ void ProcessLauncher::launchProcess()
 
     STARTUPINFO startupInfo { };
     startupInfo.cb = sizeof(startupInfo);
-    startupInfo.dwFlags = STARTF_USESHOWWINDOW;
+    startupInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
     startupInfo.wShowWindow = SW_HIDE;
+    startupInfo.hStdInput = ::GetStdHandle(STD_INPUT_HANDLE);
+    startupInfo.hStdOutput = ::GetStdHandle(STD_OUTPUT_HANDLE);
+    startupInfo.hStdError = ::GetStdHandle(STD_ERROR_HANDLE);
     PROCESS_INFORMATION processInformation { };
     BOOL result = ::CreateProcess(0, commandLine.data(), 0, 0, true, 0, 0, 0, &startupInfo, &processInformation);
 
diff --git a/Source/WebKit/UIProcess/PageClient.h b/Source/WebKit/UIProcess/PageClient.h
index c4c71874a10da9b541fee2820808c1e50d3fa92b..12fd60e8ad5482e7faab2ba9c6b6990a213e432a 100644
--- a/Source/WebKit/UIProcess/PageClient.h
+++ b/Source/WebKit/UIProcess/PageClient.h
@@ -265,7 +265,7 @@ public:
     virtual void showSafeBrowsingWarning(const SafeBrowsingWarning&, CompletionHandler<void(Variant<ContinueUnsafeLoad, URL>&&)>&& completionHandler) { completionHandler(ContinueUnsafeLoad::Yes); }
     virtual void clearSafeBrowsingWarning() { }
     virtual void clearSafeBrowsingWarningIfForMainFrameNavigation() { }
-    
+
 #if ENABLE(DRAG_SUPPORT)
 #if PLATFORM(GTK)
     virtual void startDrag(WebCore::SelectionData&&, OptionSet<WebCore::DragOperation>, RefPtr<ShareableBitmap>&& dragImage) = 0;
@@ -304,6 +304,11 @@ public:
     virtual void selectionDidChange() = 0;
 #endif
 
+// Paywright begin
+#if PLATFORM(COCOA)
+    virtual RetainPtr<CGImageRef> takeSnapshotForAutomation() = 0;
+#endif
+// Paywright end
 #if PLATFORM(COCOA) || PLATFORM(GTK)
     virtual RefPtr<ViewSnapshot> takeViewSnapshot(Optional<WebCore::IntRect>&&) = 0;
 #endif
@@ -320,6 +325,7 @@ public:
     virtual WebCore::IntRect rootViewToAccessibilityScreen(const WebCore::IntRect&) = 0;
 #if PLATFORM(MAC)
     virtual WebCore::IntRect rootViewToWindow(const WebCore::IntRect&) = 0;
+    virtual int browserToolbarHeight() const { return 0; }
 #endif
 #if PLATFORM(IOS_FAMILY)
     virtual void didNotHandleTapAsClick(const WebCore::IntPoint&) = 0;
@@ -368,7 +374,7 @@ public:
     virtual void setTextIndicator(Ref<WebCore::TextIndicator>, WebCore::TextIndicatorWindowLifetime) = 0;
     virtual void clearTextIndicator(WebCore::TextIndicatorWindowDismissalAnimation) = 0;
     virtual void setTextIndicatorAnimationProgress(float) = 0;
-    
+
     virtual void didPerformDictionaryLookup(const WebCore::DictionaryPopupInfo&) = 0;
 #endif
 
@@ -499,7 +505,7 @@ public:
     virtual bool hasSafeBrowsingWarning() const { return false; }
 
     virtual void setMouseEventPolicy(WebCore::MouseEventPolicy) { }
-    
+
 #if PLATFORM(MAC)
     virtual void didPerformImmediateActionHitTest(const WebHitTestResultData&, bool contentPreventsDefault, API::Object*) = 0;
     virtual NSObject *immediateActionAnimationControllerForHitTestResult(RefPtr<API::HitTestResult>, uint64_t, RefPtr<API::Object>) = 0;
diff --git a/Source/WebKit/UIProcess/RemoteInspectorPipe.cpp b/Source/WebKit/UIProcess/RemoteInspectorPipe.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9593d0c3cc694309a18ae791a3f6ea0725f9b0cb
--- /dev/null
+++ b/Source/WebKit/UIProcess/RemoteInspectorPipe.cpp
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "RemoteInspectorPipe.h"
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorPlaywrightAgent.h"
+#include <JavaScriptCore/InspectorFrontendChannel.h>
+#include <wtf/MainThread.h>
+#include <wtf/RunLoop.h>
+#include <wtf/UniqueArray.h>
+#include <wtf/Vector.h>
+#include <wtf/WorkQueue.h>
+
+#if OS(UNIX)
+#include <stdio.h>
+#include <unistd.h>
+#endif
+
+#if PLATFORM(WIN)
+#include <io.h>
+#endif
+
+namespace WebKit {
+
+namespace {
+
+const int readFD = 3;
+const int writeFD = 4;
+
+const size_t kWritePacketSize = 1 << 16;
+
+#if PLATFORM(WIN)
+HANDLE readHandle;
+HANDLE writeHandle;
+#endif
+
+size_t ReadBytes(void* buffer, size_t size, bool exact_size)
+{
+    size_t bytesRead = 0;
+    while (bytesRead < size) {
+#if PLATFORM(WIN)
+        DWORD sizeRead = 0;
+        bool hadError = !ReadFile(readHandle, static_cast<char*>(buffer) + bytesRead,
+            size - bytesRead, &sizeRead, nullptr);
+#else
+        int sizeRead = read(readFD, static_cast<char*>(buffer) + bytesRead,
+            size - bytesRead);
+        if (sizeRead < 0 && errno == EINTR)
+            continue;
+        bool hadError = sizeRead <= 0;
+#endif
+        if (hadError) {
+            return 0;
+        }
+        bytesRead += sizeRead;
+        if (!exact_size)
+            break;
+    }
+    return bytesRead;
+}
+
+void WriteBytes(const char* bytes, size_t size)
+{
+    size_t totalWritten = 0;
+    while (totalWritten < size) {
+        size_t length = size - totalWritten;
+        if (length > kWritePacketSize)
+            length = kWritePacketSize;
+#if PLATFORM(WIN)
+        DWORD bytesWritten = 0;
+        bool hadError = !WriteFile(writeHandle, bytes + totalWritten, static_cast<DWORD>(length), &bytesWritten, nullptr);
+#else
+        int bytesWritten = write(writeFD, bytes + totalWritten, length);
+        if (bytesWritten < 0 && errno == EINTR)
+            continue;
+        bool hadError = bytesWritten <= 0;
+#endif
+        if (hadError)
+            return;
+        totalWritten += bytesWritten;
+    }
+}
+
+}  // namespace
+
+class RemoteInspectorPipe::RemoteFrontendChannel : public Inspector::FrontendChannel {
+    WTF_MAKE_FAST_ALLOCATED;
+
+public:
+    RemoteFrontendChannel()
+        : m_senderQueue(WorkQueue::create("Inspector pipe writer"))
+    {
+    }
+
+    ~RemoteFrontendChannel() override = default;
+
+    ConnectionType connectionType() const override
+    {
+        return ConnectionType::Remote;
+    }
+
+    void sendMessageToFrontend(const String& message) override
+    {
+        m_senderQueue->dispatch([message = message.isolatedCopy()]() {
+            WriteBytes(message.ascii().data(), message.length());
+            WriteBytes("\0", 1);
+        });
+    }
+
+private:
+    Ref<WorkQueue> m_senderQueue;
+};
+
+RemoteInspectorPipe::RemoteInspectorPipe(InspectorPlaywrightAgent& playwrightAgent)
+    : m_playwrightAgent(playwrightAgent)
+{
+    // Initialize main loop before creating WorkQueue
+    WTF::initializeMainThread();
+    m_remoteFrontendChannel = makeUnique<RemoteFrontendChannel>();
+    start();
+}
+
+RemoteInspectorPipe::~RemoteInspectorPipe()
+{
+    stop();
+}
+
+bool RemoteInspectorPipe::start()
+{
+    if (m_receiverThread)
+        return true;
+
+#if PLATFORM(WIN)
+    readHandle = reinterpret_cast<HANDLE>(_get_osfhandle(readFD));
+    writeHandle = reinterpret_cast<HANDLE>(_get_osfhandle(writeFD));
+#endif
+
+    m_playwrightAgent.connectFrontend(*m_remoteFrontendChannel);
+    m_terminated = false;
+    m_receiverThread = Thread::create("Inspector pipe reader", [this] {
+        workerRun();
+    });
+    return true;
+}
+
+void RemoteInspectorPipe::stop()
+{
+    if (!m_receiverThread)
+        return;
+
+    m_playwrightAgent.disconnectFrontend();
+
+    m_terminated = true;
+    m_receiverThread->waitForCompletion();
+    m_receiverThread = nullptr;
+}
+
+void RemoteInspectorPipe::workerRun()
+{
+    const size_t bufSize = 256 * 1024;
+    auto buffer = makeUniqueArray<char>(bufSize);
+    Vector<char> line;
+    while (!m_terminated) {
+        size_t size = ReadBytes(buffer.get(), bufSize, false);
+        if (!size)
+            break;
+        size_t start = 0;
+        size_t end = line.size();
+        line.append(buffer.get(), size);
+        while (true) {
+            for (; end < line.size(); ++end) {
+                if (line[end] == '\0')
+                    break;
+            }
+            if (end == line.size())
+                break;
+
+            if (end > start) {
+                String message = String::fromUTF8(line.data() + start, end - start);
+                RunLoop::main().dispatch([this, message] {
+                    if (!m_terminated)
+                        m_playwrightAgent.dispatchMessageFromFrontend(message);
+                });
+            }
+            ++end;
+            start = end;
+        }
+        if (start != 0 && start < line.size())
+            memmove(line.data(), line.data() + start, line.size() - start);
+        line.shrink(line.size() - start);
+    }
+}
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/RemoteInspectorPipe.h b/Source/WebKit/UIProcess/RemoteInspectorPipe.h
new file mode 100644
index 0000000000000000000000000000000000000000..6d04f9290135069359ce6bf8726546482fd1dc95
--- /dev/null
+++ b/Source/WebKit/UIProcess/RemoteInspectorPipe.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include <wtf/Ref.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Threading.h>
+
+namespace Inspector {
+class FrontendChannel;
+}
+
+namespace WebKit {
+
+class InspectorPlaywrightAgent;
+
+class RemoteInspectorPipe {
+    WTF_MAKE_NONCOPYABLE(RemoteInspectorPipe);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    explicit RemoteInspectorPipe(InspectorPlaywrightAgent&);
+    ~RemoteInspectorPipe();
+
+private:
+    class RemoteFrontendChannel;
+
+    bool start();
+    void stop();
+
+    void workerRun();
+
+    RefPtr<Thread> m_receiverThread;
+    std::atomic<bool> m_terminated { false };
+    std::unique_ptr<Inspector::FrontendChannel> m_remoteFrontendChannel;
+    InspectorPlaywrightAgent& m_playwrightAgent;
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/WebAuthentication/Mock/MockLocalConnection.h b/Source/WebKit/UIProcess/WebAuthentication/Mock/MockLocalConnection.h
index ff90d3de4349c9a3385c20c059729b8e22ebe2e5..d5c4f2cd715551ddef6f5af93ada65cbe78ad213 100644
--- a/Source/WebKit/UIProcess/WebAuthentication/Mock/MockLocalConnection.h
+++ b/Source/WebKit/UIProcess/WebAuthentication/Mock/MockLocalConnection.h
@@ -28,6 +28,7 @@
 #if ENABLE(WEB_AUTHN)
 
 #include "LocalConnection.h"
+#include <WebCore/AuthenticatorAssertionResponse.h>
 #include <WebCore/MockWebAuthenticationConfiguration.h>
 
 namespace WebKit {
diff --git a/Source/WebKit/UIProcess/WebContextMenuProxy.h b/Source/WebKit/UIProcess/WebContextMenuProxy.h
index 2d2c5765c01f2680749a8f193d61fb666a08ab86..4a26ae64fee4c7e57e0336361ad92f9b024b5349 100644
--- a/Source/WebKit/UIProcess/WebContextMenuProxy.h
+++ b/Source/WebKit/UIProcess/WebContextMenuProxy.h
@@ -43,6 +43,7 @@ public:
     virtual ~WebContextMenuProxy();
 
     virtual void show();
+    virtual void hide() {}
 
     WebPageProxy* page() const { return m_page.get(); }
 
diff --git a/Source/WebKit/UIProcess/WebGeolocationManagerProxy.cpp b/Source/WebKit/UIProcess/WebGeolocationManagerProxy.cpp
index 04f3227cd55c992a42cd96a3f25d697aed7965a2..f0d36935f47bab03ea2ec50b705092068ecd3efa 100644
--- a/Source/WebKit/UIProcess/WebGeolocationManagerProxy.cpp
+++ b/Source/WebKit/UIProcess/WebGeolocationManagerProxy.cpp
@@ -128,7 +128,8 @@ void WebGeolocationManagerProxy::startUpdating(IPC::Connection& connection, WebP
     if (!wasUpdating) {
         m_provider->setEnableHighAccuracy(*this, isHighAccuracyEnabled());
         m_provider->startUpdating(*this);
-    } else if (m_lastPosition)
+    }
+    if (m_lastPosition)
         connection.send(Messages::WebGeolocationManager::DidChangePosition(m_lastPosition.value()), 0);
 }
 
diff --git a/Source/WebKit/UIProcess/WebPageInspectorEmulationAgent.cpp b/Source/WebKit/UIProcess/WebPageInspectorEmulationAgent.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e6e700e846ea091a190b6b1f5c5636fed4389909
--- /dev/null
+++ b/Source/WebKit/UIProcess/WebPageInspectorEmulationAgent.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebPageInspectorEmulationAgent.h"
+
+#include "APIPageConfiguration.h"
+#include "WebPageProxy.h"
+#include "WebPreferences.h"
+#include "PageClient.h"
+#include <JavaScriptCore/InspectorFrontendRouter.h>
+#include <WebCore/Credential.h>
+
+
+namespace WebKit {
+
+using namespace Inspector;
+
+WebPageInspectorEmulationAgent::WebPageInspectorEmulationAgent(BackendDispatcher& backendDispatcher, WebPageProxy& page)
+    : InspectorAgentBase("Emulation"_s)
+    , m_backendDispatcher(EmulationBackendDispatcher::create(backendDispatcher, this))
+    , m_page(page)
+{
+}
+
+WebPageInspectorEmulationAgent::~WebPageInspectorEmulationAgent()
+{
+}
+
+void WebPageInspectorEmulationAgent::didCreateFrontendAndBackend(FrontendRouter*, BackendDispatcher*)
+{
+}
+
+void WebPageInspectorEmulationAgent::willDestroyFrontendAndBackend(DisconnectReason)
+{
+   m_commandsToRunWhenShown.clear();
+}
+
+void WebPageInspectorEmulationAgent::setDeviceMetricsOverride(int width, int height, double deviceScaleFactor, bool fixedlayout, Ref<SetDeviceMetricsOverrideCallback>&& callback)
+{
+#if PLATFORM(GTK)
+    // On gtk, fixed layout doesn't work with compositing enabled
+    // FIXME: This turns off compositing forever, even if fixedLayout is disabled.
+    if (fixedlayout) {
+        auto copy = m_page.preferences().copy();
+        copy->setAcceleratedCompositingEnabled(false);
+        m_page.setPreferences(copy);
+    }
+#endif
+
+    m_page.setCustomDeviceScaleFactor(deviceScaleFactor);
+    m_page.setUseFixedLayout(fixedlayout);
+    if (!m_page.pageClient().isViewVisible() && m_page.configuration().relatedPage()) {
+        m_commandsToRunWhenShown.append([this, width, height, callback = WTFMove(callback)]() mutable {
+            setSize(width, height, WTFMove(callback));
+        });
+    } else {
+        setSize(width, height, WTFMove(callback));
+    }
+}
+
+void WebPageInspectorEmulationAgent::setSize(int width, int height, Ref<SetDeviceMetricsOverrideCallback>&& callback)
+{
+    platformSetSize(width, height, [callback = WTFMove(callback)](const String& error) {
+        if (error.isEmpty())
+            callback->sendSuccess();
+        else
+            callback->sendFailure(error);
+    });
+}
+
+Inspector::Protocol::ErrorStringOr<void> WebPageInspectorEmulationAgent::setJavaScriptEnabled(bool enabled)
+{
+    auto copy = m_page.preferences().copy();
+    copy->setJavaScriptEnabled(enabled);
+    m_page.setPreferences(copy);
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> WebPageInspectorEmulationAgent::setAuthCredentials(const String& username, const String& password)
+{
+    if (!!username && !!password)
+        m_page.setAuthCredentialsForAutomation(WebCore::Credential(username, password, CredentialPersistencePermanent));
+    else
+        m_page.setAuthCredentialsForAutomation(Optional<WebCore::Credential>());
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> WebPageInspectorEmulationAgent::setActiveAndFocused(Optional<bool>&& active)
+{
+    m_page.setActiveForAutomation(WTFMove(active));
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> WebPageInspectorEmulationAgent::grantPermissions(const String& origin, Ref<JSON::Array>&& values)
+{
+    HashSet<String> set;
+    for (const auto& value : values.get()) {
+        String name;
+        if (!value->asString(name))
+            return makeUnexpected("Permission must be a string"_s);
+
+        set.add(name);
+    }
+    m_permissions.set(origin, WTFMove(set));
+    m_page.setPermissionsForAutomation(m_permissions);
+    return { };
+}
+
+Inspector::Protocol::ErrorStringOr<void> WebPageInspectorEmulationAgent::resetPermissions()
+{
+    m_permissions.clear();
+    m_page.setPermissionsForAutomation(m_permissions);
+    return { };
+}
+
+void WebPageInspectorEmulationAgent::didShowPage()
+{
+    for (auto& command : m_commandsToRunWhenShown)
+        command();
+    m_commandsToRunWhenShown.clear();
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/WebPageInspectorEmulationAgent.h b/Source/WebKit/UIProcess/WebPageInspectorEmulationAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..1353851472668b3e77c19db54f224c0ca151e9d3
--- /dev/null
+++ b/Source/WebKit/UIProcess/WebPageInspectorEmulationAgent.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <JavaScriptCore/InspectorAgentBase.h>
+#include <JavaScriptCore/InspectorBackendDispatchers.h>
+
+#include <wtf/Forward.h>
+#include <wtf/Function.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/Vector.h>
+
+namespace Inspector {
+class BackendDispatcher;
+class FrontendChannel;
+class FrontendRouter;
+}
+
+namespace WebKit {
+
+class WebPageProxy;
+
+class WebPageInspectorEmulationAgent : public Inspector::InspectorAgentBase, public Inspector::EmulationBackendDispatcherHandler {
+    WTF_MAKE_NONCOPYABLE(WebPageInspectorEmulationAgent);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    WebPageInspectorEmulationAgent(Inspector::BackendDispatcher& backendDispatcher, WebPageProxy& page);
+    ~WebPageInspectorEmulationAgent() override;
+
+    void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) override;
+    void willDestroyFrontendAndBackend(Inspector::DisconnectReason) override;
+
+    void setDeviceMetricsOverride(int width, int height, double deviceScaleFactor, bool fixedlayout, Ref<SetDeviceMetricsOverrideCallback>&&) override;
+    Inspector::Protocol::ErrorStringOr<void> setJavaScriptEnabled(bool enabled) override;
+    Inspector::Protocol::ErrorStringOr<void> setAuthCredentials(const String&, const String&) override;
+    Inspector::Protocol::ErrorStringOr<void> setActiveAndFocused(Optional<bool>&&) override;
+    Inspector::Protocol::ErrorStringOr<void> grantPermissions(const String& origin, Ref<JSON::Array>&& permissions) override;
+    Inspector::Protocol::ErrorStringOr<void> resetPermissions() override;
+
+    void didShowPage();
+
+private:
+    void setSize(int width, int height, Ref<SetDeviceMetricsOverrideCallback>&& callback);
+    void platformSetSize(int width, int height, Function<void (const String& error)>&&);
+
+    Ref<Inspector::EmulationBackendDispatcher> m_backendDispatcher;
+    WebPageProxy& m_page;
+    Vector<Function<void()>> m_commandsToRunWhenShown;
+    HashMap<String, HashSet<String>> m_permissions;
+};
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/WebPageInspectorInputAgent.cpp b/Source/WebKit/UIProcess/WebPageInspectorInputAgent.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5c16e0ef1e1593d8a1d26b149d0415136501ac6d
--- /dev/null
+++ b/Source/WebKit/UIProcess/WebPageInspectorInputAgent.cpp
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebPageInspectorInputAgent.h"
+
+#include "NativeWebKeyboardEvent.h"
+#include "NativeWebMouseEvent.h"
+#include "WebPageProxy.h"
+#include <wtf/MathExtras.h>
+#include <wtf/HexNumber.h>
+
+#include "WebPageMessages.h"
+
+namespace WebKit {
+
+using namespace Inspector;
+
+namespace {
+
+template<class T>
+class CallbackList {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    ~CallbackList()
+    {
+        for (const auto& callback : m_callbacks)
+            callback->sendFailure("Page closed");
+    }
+
+    void append(Ref<T>&& callback)
+    {
+        m_callbacks.append(WTFMove(callback));
+    }
+
+    void sendSuccess()
+    {
+        for (const auto& callback : m_callbacks)
+            callback->sendSuccess();
+        m_callbacks.clear();
+    }
+
+private:
+    Vector<Ref<T>> m_callbacks;
+};
+
+} // namespace
+
+class WebPageInspectorInputAgent::KeyboardCallbacks : public CallbackList<Inspector::InputBackendDispatcherHandler::DispatchKeyEventCallback> {
+};
+
+class WebPageInspectorInputAgent::MouseCallbacks : public CallbackList<Inspector::InputBackendDispatcherHandler::DispatchMouseEventCallback> {
+};
+
+WebPageInspectorInputAgent::WebPageInspectorInputAgent(Inspector::BackendDispatcher& backendDispatcher, WebPageProxy& page)
+    : InspectorAgentBase("Input"_s)
+    , m_backendDispatcher(InputBackendDispatcher::create(backendDispatcher, this))
+    , m_page(page)
+{
+}
+
+WebPageInspectorInputAgent::~WebPageInspectorInputAgent() = default;
+
+void WebPageInspectorInputAgent::didProcessAllPendingKeyboardEvents()
+{
+    m_keyboardCallbacks->sendSuccess();
+}
+
+void WebPageInspectorInputAgent::didProcessAllPendingMouseEvents()
+{
+    m_mouseCallbacks->sendSuccess();
+}
+
+void WebPageInspectorInputAgent::didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*)
+{
+    m_keyboardCallbacks = makeUnique<KeyboardCallbacks>();
+    m_mouseCallbacks = makeUnique<MouseCallbacks>();
+}
+
+void WebPageInspectorInputAgent::willDestroyFrontendAndBackend(Inspector::DisconnectReason)
+{
+    m_keyboardCallbacks = nullptr;
+    m_mouseCallbacks = nullptr;
+}
+
+static String keyIdentifierForKey(const String& key)
+{
+    if (key.length() == 1)
+        return makeString("U+", hex(toASCIIUpper(key.characterAt(0)), 4));
+    if (key == "Delete")
+        return "U+007F";
+    if (key == "Backspace")
+        return "U+0008";
+    if (key == "ArrowUp")
+        return "Up";
+    if (key == "ArrowDown")
+        return "Down";
+    if (key == "ArrowLeft")
+        return "Left";
+    if (key == "ArrowRight")
+        return "Right";
+    if (key == "Tab")
+        return "U+0009";
+    if (key == "Pause")
+        return "Pause";
+    if (key == "ScrollLock")
+        return "Scroll";
+    return key;
+}
+
+void WebPageInspectorInputAgent::dispatchKeyEvent(const String& type, Optional<int>&& modifiers, const String& text, const String& unmodifiedText, const String& code, const String& key, Optional<int>&& windowsVirtualKeyCode, Optional<int>&& nativeVirtualKeyCode, Optional<bool>&& autoRepeat, Optional<bool>&& isKeypad, Optional<bool>&& isSystemKey, RefPtr<JSON::Array>&& commands, Ref<Inspector::InputBackendDispatcherHandler::DispatchKeyEventCallback>&& callback)
+{
+    WebKit::WebEvent::Type eventType;
+    if (type == "keyDown") {
+        eventType = WebKit::WebEvent::KeyDown;
+    } else if (type == "keyUp") {
+        eventType = WebKit::WebEvent::KeyUp;
+    } else {
+        callback->sendFailure("Unsupported event type.");
+        return;
+    }
+    OptionSet<WebEvent::Modifier> eventModifiers;
+    if (modifiers)
+        eventModifiers = eventModifiers.fromRaw(*modifiers);
+    int eventWindowsVirtualKeyCode = 0;
+    if (windowsVirtualKeyCode)
+        eventWindowsVirtualKeyCode = *windowsVirtualKeyCode;
+    int eventNativeVirtualKeyCode = 0;
+    if (nativeVirtualKeyCode)
+        eventNativeVirtualKeyCode = *nativeVirtualKeyCode;
+    Vector<String> eventCommands;
+    if (commands) {
+      for (const auto& value : *commands) {
+        String command;
+        if (!value->asString(command)) {
+          callback->sendFailure("Command must be string");
+          return;
+        }
+        eventCommands.append(command);
+      }
+    }
+
+    String keyIdentifier = keyIdentifierForKey(key);
+
+    bool eventIsAutoRepeat = false;
+    if (autoRepeat)
+        eventIsAutoRepeat = *autoRepeat;
+    bool eventIsKeypad = false;
+    if (isKeypad)
+        eventIsKeypad = *isKeypad;
+    bool eventIsSystemKey = false;
+    if (isSystemKey)
+        eventIsSystemKey = *isSystemKey;
+    WallTime timestamp = WallTime::now();
+
+    m_keyboardCallbacks->append(WTFMove(callback));
+    platformDispatchKeyEvent(
+        eventType,
+        text,
+        unmodifiedText,
+        key,
+        code,
+        keyIdentifier,
+        eventWindowsVirtualKeyCode,
+        eventNativeVirtualKeyCode,
+        eventIsAutoRepeat,
+        eventIsKeypad,
+        eventIsSystemKey,
+        eventModifiers,
+        eventCommands,
+        timestamp);
+}
+
+void WebPageInspectorInputAgent::dispatchMouseEvent(const String& type, int x, int y, Optional<int>&& modifiers, const String& button, Optional<int>&& buttons, Optional<int>&& clickCount, Optional<int>&& deltaX, Optional<int>&& deltaY, Ref<DispatchMouseEventCallback>&& callback)
+{
+    WebEvent::Type eventType = WebEvent::NoType;
+    if (type == "down")
+        eventType = WebEvent::MouseDown;
+    else if (type == "up")
+        eventType = WebEvent::MouseUp;
+    else if (type == "move")
+        eventType = WebEvent::MouseMove;
+    else {
+        callback->sendFailure("Unsupported event type");
+        return;
+    }
+
+    OptionSet<WebEvent::Modifier> eventModifiers;
+    if (modifiers)
+        eventModifiers = eventModifiers.fromRaw(*modifiers);
+
+    WebMouseEvent::Button eventButton = WebMouseEvent::NoButton;
+    if (!!button) {
+        if (button == "left")
+            eventButton = WebMouseEvent::LeftButton;
+        else if (button == "middle")
+            eventButton = WebMouseEvent::MiddleButton;
+        else if (button == "right")
+            eventButton = WebMouseEvent::RightButton;
+        else if (button == "none")
+            eventButton = WebMouseEvent::NoButton;
+        else {
+            callback->sendFailure("Unsupported eventButton");
+            return;
+        }
+    }
+
+    unsigned short eventButtons = 0;
+    if (buttons)
+        eventButtons = *buttons;
+
+    int eventClickCount = 0;
+    if (clickCount)
+        eventClickCount = *clickCount;
+    int eventDeltaX = 0;
+    if (deltaX)
+        eventDeltaX = *deltaX;
+    int eventDeltaY = 0;
+    if (deltaY)
+        eventDeltaY = *deltaY;
+    m_mouseCallbacks->append(WTFMove(callback));
+
+    // Convert css coordinates to view coordinates (dip).
+    double totalScale = m_page.pageScaleFactor() * m_page.viewScaleFactor();
+    x = clampToInteger(roundf(x * totalScale));
+    y = clampToInteger(roundf(y * totalScale));
+    eventDeltaX = clampToInteger(roundf(eventDeltaX * totalScale));
+    eventDeltaY = clampToInteger(roundf(eventDeltaY * totalScale));
+
+#if PLATFORM(MAC)
+    platformDispatchMouseEvent(type, x, y, WTFMove(modifiers), button, WTFMove(clickCount));
+#elif PLATFORM(GTK) || PLATFORM(WPE) || PLATFORM(WIN)
+    WallTime timestamp = WallTime::now();
+    NativeWebMouseEvent event(
+        eventType,
+        eventButton,
+        eventButtons,
+        {x, y},
+        WebCore::IntPoint(),
+        eventDeltaX,
+        eventDeltaY,
+        0,
+        eventClickCount,
+        eventModifiers,
+        timestamp);
+    m_page.handleMouseEvent(event);
+#endif
+}
+
+void WebPageInspectorInputAgent::dispatchTapEvent(int x, int y, Optional<int>&& modifiers, Ref<DispatchTapEventCallback>&& callback) {
+    m_page.sendWithAsyncReply(Messages::WebPage::FakeTouchTap(IntPoint(x, y), modifiers ? *modifiers : 0), [callback]() {
+        callback->sendSuccess();
+    });
+}
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/WebPageInspectorInputAgent.h b/Source/WebKit/UIProcess/WebPageInspectorInputAgent.h
new file mode 100644
index 0000000000000000000000000000000000000000..05a71c27eae03f2cdf3bcba31a8b108b09b54178
--- /dev/null
+++ b/Source/WebKit/UIProcess/WebPageInspectorInputAgent.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "WebEvent.h"
+#include "WebKeyboardEvent.h"
+#include <JavaScriptCore/InspectorAgentBase.h>
+#include <JavaScriptCore/InspectorBackendDispatchers.h>
+#include <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+
+namespace Inspector {
+class BackendDispatcher;
+class FrontendChannel;
+class FrontendRouter;
+}
+
+namespace WebKit {
+
+class NativeWebKeyboardEvent;
+class WebPageProxy;
+
+class WebPageInspectorInputAgent : public Inspector::InspectorAgentBase, public Inspector::InputBackendDispatcherHandler {
+    WTF_MAKE_NONCOPYABLE(WebPageInspectorInputAgent);
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    WebPageInspectorInputAgent(Inspector::BackendDispatcher& backendDispatcher, WebPageProxy& page);
+    ~WebPageInspectorInputAgent() override;
+
+    void didProcessAllPendingKeyboardEvents();
+    void didProcessAllPendingMouseEvents();
+
+    void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) override;
+    void willDestroyFrontendAndBackend(Inspector::DisconnectReason) override;
+
+    // Protocol handler
+    void dispatchKeyEvent(const String& type, Optional<int>&& modifiers, const String& text, const String& unmodifiedText, const String& code, const String& key, Optional<int>&& windowsVirtualKeyCode, Optional<int>&& nativeVirtualKeyCode, Optional<bool>&& autoRepeat, Optional<bool>&& isKeypad, Optional<bool>&& isSystemKey, RefPtr<JSON::Array>&&, Ref<DispatchKeyEventCallback>&& callback) override;
+    void dispatchMouseEvent(const String& type, int x, int y, Optional<int>&& modifiers, const String& button, Optional<int>&& buttons, Optional<int>&& clickCount, Optional<int>&& deltaX, Optional<int>&& deltaY, Ref<DispatchMouseEventCallback>&& callback) override;
+    void dispatchTapEvent(int x, int y, Optional<int>&& modifiers, Ref<DispatchTapEventCallback>&& callback) override;
+
+private:
+    void platformDispatchKeyEvent(WebKeyboardEvent::Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<WebEvent::Modifier> modifiers, Vector<String>& commands, WallTime timestamp);
+#if PLATFORM(WPE)
+    void platformDispatchMouseEvent(WebMouseEvent::Type type, int x, int y, WebMouseEvent::Button button, OptionSet<WebEvent::Modifier> modifiers);
+#endif
+#if PLATFORM(MAC)
+    void platformDispatchMouseEvent(const String& type, int x, int y, Optional<int>&& modifier, const String& button, Optional<int>&& clickCount);
+#endif
+
+    Ref<Inspector::InputBackendDispatcher> m_backendDispatcher;
+    WebPageProxy& m_page;
+    // Keep track of currently active modifiers across multiple keystrokes.
+    // Most platforms do not track current modifiers from synthesized events.
+    unsigned m_currentModifiers { 0 };
+    class KeyboardCallbacks;
+    std::unique_ptr<KeyboardCallbacks> m_keyboardCallbacks;
+    class MouseCallbacks;
+    std::unique_ptr<MouseCallbacks> m_mouseCallbacks;
+};
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/WebPageProxy.cpp b/Source/WebKit/UIProcess/WebPageProxy.cpp
index f054f2bc8b7fdde0e508e3da70e614dbfef170b7..2963552ce4b39e69486ac9a04b239a142340e3da 100644
--- a/Source/WebKit/UIProcess/WebPageProxy.cpp
+++ b/Source/WebKit/UIProcess/WebPageProxy.cpp
@@ -984,6 +984,7 @@ void WebPageProxy::finishAttachingToWebProcess(ProcessLaunchReason reason)
     m_pageLoadState.didSwapWebProcesses();
     if (reason != ProcessLaunchReason::InitialProcess)
         m_drawingArea->waitForBackingStoreUpdateOnNextPaint();
+    m_inspectorController->didFinishAttachingToWebProcess();
 }
 
 void WebPageProxy::didAttachToRunningProcess()
@@ -1296,6 +1297,21 @@ WebProcessProxy& WebPageProxy::ensureRunningProcess()
     return m_process;
 }
 
+RefPtr<API::Navigation> WebPageProxy::loadRequestForInspector(WebCore::ResourceRequest&& request, WebFrameProxy* frame)
+{
+    if (!frame || frame == mainFrame())
+        return loadRequest(WTFMove(request), WebCore::ShouldOpenExternalURLsPolicy::ShouldNotAllow);
+
+    auto navigation = m_navigationState->createLoadRequestNavigation(ResourceRequest(request), m_backForwardList->currentItem());
+    LoadParameters loadParameters;
+    loadParameters.navigationID = navigation->navigationID();
+    loadParameters.request = WTFMove(request);
+    loadParameters.shouldOpenExternalURLsPolicy = WebCore::ShouldOpenExternalURLsPolicy::ShouldNotAllow;
+    loadParameters.shouldTreatAsContinuingLoad = false;
+    m_process->send(Messages::WebPage::LoadRequestInFrameForInspector(loadParameters, frame->frameID()),  m_webPageID);
+    return navigation;
+}
+
 RefPtr<API::Navigation> WebPageProxy::loadRequest(ResourceRequest&& request, ShouldOpenExternalURLsPolicy shouldOpenExternalURLsPolicy, API::Object* userData)
 {
     if (m_isClosed)
@@ -1755,6 +1771,31 @@ void WebPageProxy::setControlledByAutomation(bool controlled)
     websiteDataStore().networkProcess().send(Messages::NetworkProcess::SetSessionIsControlledByAutomation(m_websiteDataStore->sessionID(), m_controlledByAutomation), 0);
 }
 
+void WebPageProxy::setAuthCredentialsForAutomation(Optional<WebCore::Credential>&& credentials)
+{
+    m_credentialsForAutomation = WTFMove(credentials);
+}
+
+void WebPageProxy::setPermissionsForAutomation(const HashMap<String, HashSet<String>>& permissions)
+{
+    m_permissionsForAutomation = permissions;
+}
+
+void WebPageProxy::setActiveForAutomation(Optional<bool> active) {
+    m_activeForAutomation = active;
+    OptionSet<ActivityState::Flag> state;
+    state.add(ActivityState::IsFocused);
+    state.add(ActivityState::WindowIsActive);
+    state.add(ActivityState::IsVisible);
+    state.add(ActivityState::IsVisibleOrOccluded);
+    activityStateDidChange(state);
+}
+
+void WebPageProxy::logToStderr(const String& str)
+{
+    fprintf(stderr, "RENDERER: %s\n", str.utf8().data());
+}
+
 void WebPageProxy::createInspectorTarget(const String& targetId, Inspector::InspectorTargetType type)
 {
     MESSAGE_CHECK(m_process, !targetId.isEmpty());
@@ -1894,6 +1935,25 @@ void WebPageProxy::updateActivityState(OptionSet<ActivityState::Flag> flagsToUpd
 {
     bool wasVisible = isViewVisible();
     m_activityState.remove(flagsToUpdate);
+
+
+    if (m_activeForAutomation) {
+        if (*m_activeForAutomation) {
+            if (flagsToUpdate & ActivityState::IsFocused)
+                m_activityState.add(ActivityState::IsFocused);
+            if (flagsToUpdate & ActivityState::WindowIsActive)
+                m_activityState.add(ActivityState::WindowIsActive);
+            if (flagsToUpdate & ActivityState::IsVisible)
+                m_activityState.add(ActivityState::IsVisible);
+            if (flagsToUpdate & ActivityState::IsVisibleOrOccluded)
+                m_activityState.add(ActivityState::IsVisibleOrOccluded);
+        }
+        flagsToUpdate.remove(ActivityState::IsFocused);
+        flagsToUpdate.remove(ActivityState::WindowIsActive);
+        flagsToUpdate.remove(ActivityState::IsVisible);
+        flagsToUpdate.remove(ActivityState::IsVisibleOrOccluded);
+    }
+
     if (flagsToUpdate & ActivityState::IsFocused && pageClient().isViewFocused())
         m_activityState.add(ActivityState::IsFocused);
     if (flagsToUpdate & ActivityState::WindowIsActive && pageClient().isViewWindowActive())
@@ -2775,7 +2835,7 @@ static TrackingType mergeTrackingTypes(TrackingType a, TrackingType b)
 
 void WebPageProxy::updateTouchEventTracking(const WebTouchEvent& touchStartEvent)
 {
-#if ENABLE(ASYNC_SCROLLING) && PLATFORM(COCOA)
+#if ENABLE(ASYNC_SCROLLING) && PLATFORM(IOS_FAMILY)
     const EventNames& names = eventNames();
     for (auto& touchPoint : touchStartEvent.touchPoints()) {
         IntPoint location = touchPoint.location();
@@ -2808,7 +2868,7 @@ void WebPageProxy::updateTouchEventTracking(const WebTouchEvent& touchStartEvent
     m_touchAndPointerEventTracking.touchStartTracking = TrackingType::Synchronous;
     m_touchAndPointerEventTracking.touchMoveTracking = TrackingType::Synchronous;
     m_touchAndPointerEventTracking.touchEndTracking = TrackingType::Synchronous;
-#endif // ENABLE(ASYNC_SCROLLING)
+#endif // ENABLE(ASYNC_SCROLLING) && PLATFORM(IOS_FAMILY)
 }
 
 TrackingType WebPageProxy::touchEventTrackingType(const WebTouchEvent& touchStartEvent) const
@@ -3227,6 +3287,7 @@ void WebPageProxy::receivedNavigationPolicyDecision(PolicyAction policyAction, A
 
 void WebPageProxy::receivedPolicyDecision(PolicyAction action, API::Navigation* navigation, RefPtr<API::WebsitePolicies>&& websitePolicies, Ref<PolicyDecisionSender>&& sender, Optional<SandboxExtension::Handle> sandboxExtensionHandle, WillContinueLoadInNewProcess willContinueLoadInNewProcess)
 {
+    m_inspectorController->didReceivePolicyDecision(action, navigation ? navigation->navigationID() : 0);
     if (!hasRunningProcess()) {
         sender->send(PolicyDecision { sender->identifier(), isNavigatingToAppBoundDomain(), PolicyAction::Ignore, 0, WTF::nullopt, WTF::nullopt });
         return;
@@ -3923,6 +3984,11 @@ void WebPageProxy::pageScaleFactorDidChange(double scaleFactor)
     m_pageScaleFactor = scaleFactor;
 }
 
+void WebPageProxy::viewScaleFactorDidChange(double scaleFactor)
+{
+    m_viewScaleFactor = scaleFactor;
+}
+
 void WebPageProxy::pluginScaleFactorDidChange(double pluginScaleFactor)
 {
     m_pluginScaleFactor = pluginScaleFactor;
@@ -4339,6 +4405,7 @@ void WebPageProxy::didDestroyNavigation(uint64_t navigationID)
 
     // FIXME: Message check the navigationID.
     m_navigationState->didDestroyNavigation(navigationID);
+    m_inspectorController->didDestroyNavigation(navigationID);
 }
 
 void WebPageProxy::didStartProvisionalLoadForFrame(FrameIdentifier frameID, FrameInfoData&& frameInfo, ResourceRequest&& request, uint64_t navigationID, URL&& url, URL&& unreachableURL, const UserData& userData)
@@ -4561,6 +4628,8 @@ void WebPageProxy::didFailProvisionalLoadForFrameShared(Ref<WebProcessProxy>&& p
 
     m_failingProvisionalLoadURL = { };
 
+    m_inspectorController->didFailProvisionalLoadForFrame(navigationID, error);
+
     // If the provisional page's load fails then we destroy the provisional page.
     if (m_provisionalPage && m_provisionalPage->mainFrame() == frame && willContinueLoading == WillContinueLoading::No)
         m_provisionalPage = nullptr;
@@ -5007,7 +5076,14 @@ void WebPageProxy::decidePolicyForNavigationActionAsync(FrameIdentifier frameID,
     NavigationActionData&& navigationActionData, FrameInfoData&& originatingFrameInfo, Optional<WebPageProxyIdentifier> originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&& request,
     IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData& userData, uint64_t listenerID)
 {
-    decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), m_webPageID, frameID, WTFMove(frameInfo), identifier, navigationID, WTFMove(navigationActionData), WTFMove(originatingFrameInfo), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
+    if (m_inspectorController->shouldPauseLoading()) {
+        m_inspectorController->setContinueLoadingCallback([this, protectedThis = makeRef(*this), frameID, frameInfo = WTFMove(frameInfo), identifier, navigationID, navigationActionData = WTFMove(navigationActionData),
+                originatingFrameInfo = WTFMove(originatingFrameInfo), originatingPageID, originalRequest, request = WTFMove(request), requestBody = WTFMove(requestBody), redirectResponse = WTFMove(redirectResponse), userData, listenerID] () mutable {
+            decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), m_webPageID, frameID, WTFMove(frameInfo), identifier, navigationID, WTFMove(navigationActionData), WTFMove(originatingFrameInfo), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
+        });
+    } else {
+        decidePolicyForNavigationActionAsyncShared(m_process.copyRef(), m_webPageID, frameID, WTFMove(frameInfo), identifier, navigationID, WTFMove(navigationActionData), WTFMove(originatingFrameInfo), originatingPageID, originalRequest, WTFMove(request), WTFMove(requestBody), WTFMove(redirectResponse), userData, listenerID);
+    }
 }
 
 void WebPageProxy::decidePolicyForNavigationActionAsyncShared(Ref<WebProcessProxy>&& process, PageIdentifier webPageID, FrameIdentifier frameID, FrameInfoData&& frameInfo,
@@ -5524,6 +5600,7 @@ void WebPageProxy::createNewPage(FrameInfoData&& originatingFrameInfoData, WebPa
     auto* originatingPage = m_process->webPage(originatingPageID);
     auto originatingFrameInfo = API::FrameInfo::create(WTFMove(originatingFrameInfoData), originatingPage);
     auto mainFrameURL = m_mainFrame ? m_mainFrame->url() : URL();
+    m_inspectorController->willCreateNewPage(windowFeatures, request.url());
     auto completionHandler = [this, protectedThis = makeRef(*this), mainFrameURL, request, reply = WTFMove(reply), privateClickMeasurement = navigationActionData.privateClickMeasurement] (RefPtr<WebPageProxy> newPage) mutable {
         if (!newPage) {
             reply(WTF::nullopt, WTF::nullopt);
@@ -5554,6 +5631,7 @@ void WebPageProxy::createNewPage(FrameInfoData&& originatingFrameInfoData, WebPa
 void WebPageProxy::showPage()
 {
     m_uiClient->showPage(this);
+    m_inspectorController->didShowPage();
 }
 
 void WebPageProxy::exitFullscreenImmediately()
@@ -5589,6 +5667,10 @@ void WebPageProxy::closePage()
     if (isClosed())
         return;
 
+#if ENABLE(CONTEXT_MENUS)
+    if (m_activeContextMenu)
+        m_activeContextMenu->hide();
+#endif
     RELEASE_LOG_IF_ALLOWED(Process, "closePage:");
     pageClient().clearAllEditCommands();
     m_uiClient->close(this);
@@ -5608,6 +5690,8 @@ void WebPageProxy::runJavaScriptAlert(FrameIdentifier frameID, FrameInfoData&& f
         if (auto* automationSession = process().processPool().automationSession())
             automationSession->willShowJavaScriptDialog(*this);
     }
+    if (m_inspectorDialogAgent)
+        m_inspectorDialogAgent->javascriptDialogOpening("alert"_s, message);
     m_uiClient->runJavaScriptAlert(*this, message, frame, WTFMove(frameInfo), WTFMove(reply));
 }
 
@@ -5625,6 +5709,8 @@ void WebPageProxy::runJavaScriptConfirm(FrameIdentifier frameID, FrameInfoData&&
         if (auto* automationSession = process().processPool().automationSession())
             automationSession->willShowJavaScriptDialog(*this);
     }
+    if (m_inspectorDialogAgent)
+        m_inspectorDialogAgent->javascriptDialogOpening("confirm"_s, message);
 
     m_uiClient->runJavaScriptConfirm(*this, message, frame, WTFMove(frameInfo), WTFMove(reply));
 }
@@ -5643,6 +5729,8 @@ void WebPageProxy::runJavaScriptPrompt(FrameIdentifier frameID, FrameInfoData&&
         if (auto* automationSession = process().processPool().automationSession())
             automationSession->willShowJavaScriptDialog(*this);
     }
+    if (m_inspectorDialogAgent)
+        m_inspectorDialogAgent->javascriptDialogOpening("prompt"_s, message, defaultValue);
 
     m_uiClient->runJavaScriptPrompt(*this, message, defaultValue, frame, WTFMove(frameInfo), WTFMove(reply));
 }
@@ -5798,6 +5886,8 @@ void WebPageProxy::runBeforeUnloadConfirmPanel(FrameIdentifier frameID, FrameInf
             return;
         }
     }
+    if (m_inspectorDialogAgent)
+        m_inspectorDialogAgent->javascriptDialogOpening("beforeunload"_s, message);
 
     // Since runBeforeUnloadConfirmPanel() can spin a nested run loop we need to turn off the responsiveness timer and the tryClose timer.
     m_process->stopResponsivenessTimer();
@@ -6944,6 +7034,7 @@ void WebPageProxy::didReceiveEvent(uint32_t opaqueType, bool handled)
             if (auto* automationSession = process().processPool().automationSession())
                 automationSession->mouseEventsFlushedForPage(*this);
             didFinishProcessingAllPendingMouseEvents();
+            m_inspectorController->didProcessAllPendingMouseEvents();
         }
         break;
     }
@@ -6970,7 +7061,6 @@ void WebPageProxy::didReceiveEvent(uint32_t opaqueType, bool handled)
     case WebEvent::RawKeyDown:
     case WebEvent::Char: {
         LOG(KeyHandling, "WebPageProxy::didReceiveEvent: %s (queue empty %d)", webKeyboardEventTypeString(type), m_keyEventQueue.isEmpty());
-
         MESSAGE_CHECK(m_process, !m_keyEventQueue.isEmpty());
         auto event = m_keyEventQueue.takeFirst();
         MESSAGE_CHECK(m_process, type == event.type());
@@ -6989,7 +7079,6 @@ void WebPageProxy::didReceiveEvent(uint32_t opaqueType, bool handled)
         // The call to doneWithKeyEvent may close this WebPage.
         // Protect against this being destroyed.
         Ref<WebPageProxy> protect(*this);
-
         pageClient().doneWithKeyEvent(event, handled);
         if (!handled)
             m_uiClient->didNotHandleKeyEvent(this, event);
@@ -6998,6 +7087,7 @@ void WebPageProxy::didReceiveEvent(uint32_t opaqueType, bool handled)
         if (!canProcessMoreKeyEvents) {
             if (auto* automationSession = process().processPool().automationSession())
                 automationSession->keyboardEventsFlushedForPage(*this);
+            m_inspectorController->didProcessAllPendingKeyboardEvents();
         }
         break;
     }
@@ -7409,7 +7499,6 @@ static bool shouldReloadAfterProcessTermination(ProcessTerminationReason reason)
 void WebPageProxy::dispatchProcessDidTerminate(ProcessTerminationReason reason)
 {
     RELEASE_LOG_ERROR_IF_ALLOWED(Loading, "dispatchProcessDidTerminate: reason = %d", reason);
-
     // We notify the client asynchronously because several pages may share the same process
     // and we want to make sure all pages are aware their process has crashed before the
     // the client reacts to the process termination.
@@ -7417,7 +7506,10 @@ void WebPageProxy::dispatchProcessDidTerminate(ProcessTerminationReason reason)
         if (!weakThis)
             return;
 
-        bool handledByClient = false;
+        bool handledByClient = m_inspectorController->pageCrashed(reason);
+        if (handledByClient)
+            return;
+
         if (m_loaderClient)
             handledByClient = reason != ProcessTerminationReason::RequestedByClient && m_loaderClient->processDidCrash(*this);
         else
@@ -7758,6 +7850,7 @@ static const Vector<ASCIILiteral>& mediaRelatedMachServices()
 
 WebPageCreationParameters WebPageProxy::creationParameters(WebProcessProxy& process, DrawingAreaProxy& drawingArea, RefPtr<API::WebsitePolicies>&& websitePolicies)
 {
+
     WebPageCreationParameters parameters;
 
     parameters.processDisplayName = configuration().processDisplayName();
@@ -7937,6 +8030,8 @@ WebPageCreationParameters WebPageProxy::creationParameters(WebProcessProxy& proc
     parameters.shouldRelaxThirdPartyCookieBlocking = m_configuration->shouldRelaxThirdPartyCookieBlocking();
     parameters.canUseCredentialStorage = m_canUseCredentialStorage;
 
+    parameters.shouldPauseInInspectorWhenShown = m_inspectorController->shouldPauseLoading();
+
 #if PLATFORM(GTK)
     parameters.themeName = pageClient().themeName();
 #endif
@@ -8006,6 +8101,14 @@ void WebPageProxy::gamepadActivity(const Vector<GamepadData>& gamepadDatas, Even
 
 void WebPageProxy::didReceiveAuthenticationChallengeProxy(Ref<AuthenticationChallengeProxy>&& authenticationChallenge, NegotiatedLegacyTLS negotiatedLegacyTLS)
 {
+    if (m_credentialsForAutomation.hasValue()) {
+        if (m_credentialsForAutomation->isEmpty() || authenticationChallenge->core().previousFailureCount()) {
+            authenticationChallenge->listener().completeChallenge(AuthenticationChallengeDisposition::PerformDefaultHandling);
+            return;
+        }
+        authenticationChallenge->listener().completeChallenge(AuthenticationChallengeDisposition::UseCredential, *m_credentialsForAutomation);
+        return;
+    }
     if (negotiatedLegacyTLS == NegotiatedLegacyTLS::Yes) {
         m_navigationClient->shouldAllowLegacyTLS(*this, authenticationChallenge.get(), [this, protectedThis = makeRef(*this), authenticationChallenge] (bool shouldAllowLegacyTLS) {
             if (shouldAllowLegacyTLS)
@@ -8091,7 +8194,8 @@ void WebPageProxy::requestGeolocationPermissionForFrame(GeolocationIdentifier ge
     MESSAGE_CHECK(m_process, frame);
 
     // FIXME: Geolocation should probably be using toString() as its string representation instead of databaseIdentifier().
-    auto origin = API::SecurityOrigin::create(frameInfo.securityOrigin.securityOrigin());
+    auto securityOrigin = frameInfo.securityOrigin.securityOrigin();
+    auto origin = API::SecurityOrigin::create(securityOrigin);
     auto request = m_geolocationPermissionRequestManager.createRequest(geolocationID);
     Function<void(bool)> completionHandler = [request = WTFMove(request)](bool allowed) {
         if (allowed)
@@ -8100,6 +8204,14 @@ void WebPageProxy::requestGeolocationPermissionForFrame(GeolocationIdentifier ge
             request->deny();
     };
 
+    auto permissions = m_permissionsForAutomation.find(securityOrigin->toString());
+    if (permissions == m_permissionsForAutomation.end())
+      permissions = m_permissionsForAutomation.find("*");
+    if (permissions != m_permissionsForAutomation.end()) {
+        completionHandler(permissions->value.contains("geolocation"));
+        return;
+    }
+
     // FIXME: Once iOS migrates to the new WKUIDelegate SPI, clean this up
     // and make it one UIClient call that calls the completionHandler with false
     // if there is no delegate instead of returning the completionHandler
diff --git a/Source/WebKit/UIProcess/WebPageProxy.h b/Source/WebKit/UIProcess/WebPageProxy.h
index f2c9ad4f285e14fc4f14a4ff48063051d58960f6..c22c4937bac68dc2b062ded372341e89a391a174 100644
--- a/Source/WebKit/UIProcess/WebPageProxy.h
+++ b/Source/WebKit/UIProcess/WebPageProxy.h
@@ -37,6 +37,7 @@
 #include "GeolocationIdentifier.h"
 #include "GeolocationPermissionRequestManagerProxy.h"
 #include "HiddenPageThrottlingAutoIncreasesCounter.h"
+#include "InspectorDialogAgent.h"
 #include "LayerTreeContext.h"
 #include "MediaPlaybackState.h"
 #include "MessageSender.h"
@@ -511,6 +512,8 @@ public:
     void setControlledByAutomation(bool);
 
     WebPageInspectorController& inspectorController() { return *m_inspectorController; }
+    InspectorDialogAgent* inspectorDialogAgent() { return m_inspectorDialogAgent; }
+    void setInspectorDialogAgent(InspectorDialogAgent * dialogAgent) { m_inspectorDialogAgent = dialogAgent; }
 
 #if PLATFORM(IOS_FAMILY)
     void showInspectorIndication();
@@ -582,6 +585,11 @@ public:
 
     void setPageLoadStateObserver(std::unique_ptr<PageLoadState::Observer>&&);
 
+    void setAuthCredentialsForAutomation(Optional<WebCore::Credential>&&);
+    void setPermissionsForAutomation(const HashMap<String, HashSet<String>>&);
+    void setActiveForAutomation(Optional<bool> active);
+    void logToStderr(const String& str);
+
     void initializeWebPage();
     void setDrawingArea(std::unique_ptr<DrawingAreaProxy>&&);
 
@@ -607,6 +615,7 @@ public:
     void closePage();
 
     void addPlatformLoadParameters(WebProcessProxy&, LoadParameters&);
+    RefPtr<API::Navigation> loadRequestForInspector(WebCore::ResourceRequest&&, WebFrameProxy*);
     RefPtr<API::Navigation> loadRequest(WebCore::ResourceRequest&&, WebCore::ShouldOpenExternalURLsPolicy = WebCore::ShouldOpenExternalURLsPolicy::ShouldAllowExternalSchemesButNotAppLinks, API::Object* userData = nullptr);
     RefPtr<API::Navigation> loadFile(const String& fileURL, const String& resourceDirectoryURL, API::Object* userData = nullptr);
     RefPtr<API::Navigation> loadData(const IPC::DataReference&, const String& MIMEType, const String& encoding, const String& baseURL, API::Object* userData = nullptr, WebCore::ShouldOpenExternalURLsPolicy = WebCore::ShouldOpenExternalURLsPolicy::ShouldNotAllow);
@@ -1106,6 +1115,7 @@ public:
 #endif
 
     void pageScaleFactorDidChange(double);
+    void viewScaleFactorDidChange(double);
     void pluginScaleFactorDidChange(double);
     void pluginZoomFactorDidChange(double);
 
@@ -1424,6 +1434,8 @@ public:
 
 #if PLATFORM(COCOA) || PLATFORM(GTK)
     RefPtr<ViewSnapshot> takeViewSnapshot(Optional<WebCore::IntRect>&&);
+#elif PLATFORM(WPE)
+    RefPtr<ViewSnapshot> takeViewSnapshot(Optional<WebCore::IntRect>&&) { return nullptr; }
 #endif
 
 #if ENABLE(WEB_CRYPTO)
@@ -2429,6 +2441,7 @@ private:
     String m_overrideContentSecurityPolicy;
 
     RefPtr<WebInspectorProxy> m_inspector;
+    InspectorDialogAgent* m_inspectorDialogAgent { nullptr };
 
 #if ENABLE(FULLSCREEN_API)
     std::unique_ptr<WebFullScreenManagerProxy> m_fullScreenManager;
@@ -2864,6 +2877,9 @@ private:
         RefPtr<API::Object> messageBody;
     };
     Vector<InjectedBundleMessage> m_pendingInjectedBundleMessages;
+    Optional<WebCore::Credential> m_credentialsForAutomation;
+    HashMap<String, HashSet<String>> m_permissionsForAutomation;
+    Optional<bool> m_activeForAutomation;
         
 #if PLATFORM(IOS_FAMILY) && ENABLE(DEVICE_ORIENTATION)
     std::unique_ptr<WebDeviceOrientationUpdateProviderProxy> m_webDeviceOrientationUpdateProviderProxy;
diff --git a/Source/WebKit/UIProcess/WebPageProxy.messages.in b/Source/WebKit/UIProcess/WebPageProxy.messages.in
index ffa7d61cee2593714d298626326b4639f3c46990..cd6d06fc312022b005149f0d4b90b71076d853c7 100644
--- a/Source/WebKit/UIProcess/WebPageProxy.messages.in
+++ b/Source/WebKit/UIProcess/WebPageProxy.messages.in
@@ -29,6 +29,7 @@ messages -> WebPageProxy {
     RunJavaScriptConfirm(WebCore::FrameIdentifier frameID, struct WebKit::FrameInfoData frameInfo, String message) -> (bool result) Synchronous
     RunJavaScriptPrompt(WebCore::FrameIdentifier frameID, struct WebKit::FrameInfoData frameInfo, String message, String defaultValue) -> (String result) Synchronous
     MouseDidMoveOverElement(struct WebKit::WebHitTestResultData hitTestResultData, uint32_t modifiers, WebKit::UserData userData)
+    LogToStderr(String text)
 
 #if ENABLE(NETSCAPE_PLUGIN_API)
     UnavailablePluginButtonClicked(uint32_t pluginUnavailabilityReason, String mimeType, String pluginURLString, String pluginspageAttributeURLString, String frameURLString, String pageURLString)
@@ -207,6 +208,7 @@ messages -> WebPageProxy {
 #endif
 
     PageScaleFactorDidChange(double scaleFactor)
+    ViewScaleFactorDidChange(double scaleFactor)
     PluginScaleFactorDidChange(double zoomFactor)
     PluginZoomFactorDidChange(double zoomFactor)
 
diff --git a/Source/WebKit/UIProcess/WebProcessPool.cpp b/Source/WebKit/UIProcess/WebProcessPool.cpp
index 70fddaf8dd0056ca2948e9f13250c9aba0a1bf8c..a1c0864df329a30783d39d3628aaa196d81da088 100644
--- a/Source/WebKit/UIProcess/WebProcessPool.cpp
+++ b/Source/WebKit/UIProcess/WebProcessPool.cpp
@@ -553,6 +553,14 @@ void WebProcessPool::establishWorkerContextConnectionToNetworkProcess(NetworkPro
 
     // Arbitrarily choose the first process pool to host the service worker process.
     auto* processPool = processPools()[0];
+    // Playwright begin
+    for (auto& process : websiteDataStore->processes()) {
+        if (process.processPoolIfExists()) {
+            processPool = process.processPoolIfExists();
+            break;
+        }
+    }
+    // Playwright end
     ASSERT(processPool);
 
     WebProcessProxy* serviceWorkerProcessProxy { nullptr };
@@ -789,7 +797,10 @@ void WebProcessPool::initializeNewWebProcess(WebProcessProxy& process, WebsiteDa
 #endif
 
     parameters.cacheModel = LegacyGlobalSettings::singleton().cacheModel();
-    parameters.overrideLanguages = configuration().overrideLanguages();
+    if (websiteDataStore && websiteDataStore->languagesForAutomation().size())
+        parameters.overrideLanguages = websiteDataStore->languagesForAutomation();
+    else
+        parameters.overrideLanguages = configuration().overrideLanguages();
 
     parameters.urlSchemesRegisteredAsEmptyDocument = copyToVector(m_schemesToRegisterAsEmptyDocument);
     parameters.urlSchemesRegisteredAsSecure = copyToVector(LegacyGlobalSettings::singleton().schemesToRegisterAsSecure());
diff --git a/Source/WebKit/UIProcess/WebProcessProxy.cpp b/Source/WebKit/UIProcess/WebProcessProxy.cpp
index a9f8282be5401089c29427b0886077a48694c781..d739bec96f37edf39afcdc630878fcdfc6d65286 100644
--- a/Source/WebKit/UIProcess/WebProcessProxy.cpp
+++ b/Source/WebKit/UIProcess/WebProcessProxy.cpp
@@ -119,6 +119,11 @@ HashMap<ProcessIdentifier, WebProcessProxy*>& WebProcessProxy::allProcesses()
     return map;
 }
 
+Vector<WebProcessProxy*> WebProcessProxy::allProcessesForInspector()
+{
+    return copyToVector(allProcesses().values());
+}
+
 WebProcessProxy* WebProcessProxy::processForIdentifier(ProcessIdentifier identifier)
 {
     return allProcesses().get(identifier);
diff --git a/Source/WebKit/UIProcess/WebProcessProxy.h b/Source/WebKit/UIProcess/WebProcessProxy.h
index 50bcb9cab9040608e24755db7630a4ada6e6a8f5..a1d35d8847607e1bb04e35585042dec7ba95670a 100644
--- a/Source/WebKit/UIProcess/WebProcessProxy.h
+++ b/Source/WebKit/UIProcess/WebProcessProxy.h
@@ -133,6 +133,7 @@ public:
     ~WebProcessProxy();
 
     static void forWebPagesWithOrigin(PAL::SessionID, const WebCore::SecurityOriginData&, const Function<void(WebPageProxy&)>&);
+    static Vector<WebProcessProxy*> allProcessesForInspector();
 
     WebConnection* webConnection() const { return m_webConnection.get(); }
 
diff --git a/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp b/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp
index 0e4439244ff81ab55d6ae1a429da339d86d6d672..a4a764a88e9f75081688028f413b816bf4129ef7 100644
--- a/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp
+++ b/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp
@@ -2310,6 +2310,17 @@ void WebsiteDataStore::renameOriginInWebsiteData(URL&& oldName, URL&& newName, O
     networkProcess().renameOriginInWebsiteData(m_sessionID, oldName, newName, dataTypes, WTFMove(completionHandler));
 }
 
+void WebsiteDataStore::setLanguagesForAutomation(Vector<String>&& languages)
+{
+    m_languagesForAutomation = WTFMove(languages);
+}
+
+void WebsiteDataStore::setDownloadForAutomation(Optional<bool> allow, const String& downloadPath)
+{
+    m_allowDownloadForAutomation = allow;
+    m_downloadPathForAutomation = downloadPath;
+}
+
 #if ENABLE(APP_BOUND_DOMAINS)
 void WebsiteDataStore::hasAppBoundSession(CompletionHandler<void(bool)>&& completionHandler) const
 {
diff --git a/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.h b/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.h
index d5b4e3d32115201b6a09943f96597b05b6bdff9d..f6a330d0731964d91dff237956980c47295dcae1 100644
--- a/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.h
+++ b/Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.h
@@ -92,6 +92,7 @@ enum class CacheModel : uint8_t;
 enum class WebsiteDataFetchOption : uint8_t;
 enum class WebsiteDataType : uint32_t;
 
+struct FrameInfoData;
 struct NetworkProcessConnectionInfo;
 struct WebsiteDataRecord;
 struct WebsiteDataStoreParameters;
@@ -106,6 +107,16 @@ enum class StorageAccessPromptStatus;
 struct PluginModuleInfo;
 #endif
 
+class WebsiteDataStore;
+
+class DownloadInstrumentation {
+public:
+    virtual void downloadCreated(const String& uuid, const WebCore::ResourceRequest&, const FrameInfoData& frameInfoData, WebPageProxy* page) = 0;
+    virtual void downloadFilenameSuggested(const String& uuid, const String& suggestedFilename) = 0;
+    virtual void downloadFinished(const String& uuid, const String& error) = 0;
+    virtual ~DownloadInstrumentation() = default;
+};
+
 class WebsiteDataStore : public API::ObjectImpl<API::Object::Type::WebsiteDataStore>, public Identified<WebsiteDataStore>, public CanMakeWeakPtr<WebsiteDataStore>  {
 public:
     static Ref<WebsiteDataStore> defaultDataStore();
@@ -275,11 +286,13 @@ public:
     const WebCore::CurlProxySettings& networkProxySettings() const { return m_proxySettings; }
 #endif
 
-#if USE(SOUP)
+#if USE(SOUP) || PLATFORM(COCOA) || PLATFORM(WIN)
     void setPersistentCredentialStorageEnabled(bool);
     bool persistentCredentialStorageEnabled() const { return m_persistentCredentialStorageEnabled && isPersistent(); }
     void setIgnoreTLSErrors(bool);
     bool ignoreTLSErrors() const { return m_ignoreTLSErrors; }
+#endif
+#if USE(SOUP)
     void setNetworkProxySettings(WebCore::SoupNetworkProxySettings&&);
     const WebCore::SoupNetworkProxySettings& networkProxySettings() const { return m_networkProxySettings; }
 #endif
@@ -332,6 +345,14 @@ public:
     static WTF::String defaultJavaScriptConfigurationDirectory();
     static bool http3Enabled();
 
+    void setLanguagesForAutomation(Vector<String>&&);
+    Vector<String>& languagesForAutomation() { return m_languagesForAutomation; };
+    void setDownloadForAutomation(Optional<bool> allow, const String& downloadPath);
+    Optional<bool> allowDownloadForAutomation() { return m_allowDownloadForAutomation; };
+    String downloadPathForAutomation() { return m_downloadPathForAutomation; };
+    void setDownloadInstrumentation(DownloadInstrumentation* instrumentation) { m_downloadInstrumentation = instrumentation; };
+    DownloadInstrumentation* downloadInstrumentation() { return m_downloadInstrumentation; };
+
     void resetQuota(CompletionHandler<void()>&&);
 
 #if ENABLE(APP_BOUND_DOMAINS)
@@ -416,9 +437,11 @@ private:
     WebCore::CurlProxySettings m_proxySettings;
 #endif
 
-#if USE(SOUP)
+#if USE(SOUP) || PLATFORM(COCOA) || PLATFORM(WIN)
     bool m_persistentCredentialStorageEnabled { true };
     bool m_ignoreTLSErrors { true };
+#endif
+#if USE(SOUP)
     WebCore::SoupNetworkProxySettings m_networkProxySettings;
 #endif
 
@@ -443,6 +466,11 @@ private:
     RefPtr<API::HTTPCookieStore> m_cookieStore;
     RefPtr<NetworkProcessProxy> m_networkProcess;
 
+    Vector<String> m_languagesForAutomation;
+    Optional<bool> m_allowDownloadForAutomation;
+    String m_downloadPathForAutomation;
+    DownloadInstrumentation* m_downloadInstrumentation { nullptr };
+
 #if HAVE(APP_SSO)
     UniqueRef<SOAuthorizationCoordinator> m_soAuthorizationCoordinator;
 #endif
diff --git a/Source/WebKit/UIProcess/cairo/BackingStoreCairo.cpp b/Source/WebKit/UIProcess/cairo/BackingStoreCairo.cpp
index dc0a70b8824afdc7ec3dd1f69f4d9b51942924f6..a4e90dc22fb278864c49c0636964e82f3d0d7193 100644
--- a/Source/WebKit/UIProcess/cairo/BackingStoreCairo.cpp
+++ b/Source/WebKit/UIProcess/cairo/BackingStoreCairo.cpp
@@ -27,9 +27,11 @@
 #include "config.h"
 #include "BackingStore.h"
 
+#include "DrawingAreaProxyCoordinatedGraphics.h"
 #include "ShareableBitmap.h"
 #include "UpdateInfo.h"
 #include "WebPageProxy.h"
+#include "WebPageInspectorController.h"
 #include <WebCore/BackingStoreBackendCairoImpl.h>
 #include <WebCore/CairoUtilities.h>
 #include <WebCore/GraphicsContextImplCairo.h>
@@ -62,6 +64,13 @@ std::unique_ptr<BackingStoreBackendCairo> BackingStore::createBackend()
     return makeUnique<BackingStoreBackendCairoImpl>(m_size, m_deviceScaleFactor);
 }
 
+cairo_surface_t* BackingStore::surface() const {
+    if (!m_backend)
+        return nullptr;
+
+    return m_backend->surface();
+}
+
 void BackingStore::paint(cairo_t* context, const IntRect& rect)
 {
     ASSERT(m_backend);
diff --git a/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.cpp b/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.cpp
index 411056d43ea764c42bce0403e6c69ddb8b24b04e..86d4e842699a230ce595088b62a29eabea5b6b90 100644
--- a/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.cpp
+++ b/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.cpp
@@ -60,6 +60,8 @@ void GeoclueGeolocationProvider::start(UpdateNotifyFunction&& updateNotifyFuncti
     m_isRunning = true;
     m_cancellable = adoptGRef(g_cancellable_new());
     if (!m_manager) {
+        g_cancellable_cancel(m_cancellable_start.get());
+        m_cancellable_start = adoptGRef(g_cancellable_new());
         g_dbus_proxy_new_for_bus(G_BUS_TYPE_SYSTEM, G_DBUS_PROXY_FLAGS_NONE, nullptr,
             "org.freedesktop.GeoClue2", "/org/freedesktop/GeoClue2/Manager", "org.freedesktop.GeoClue2.Manager", m_cancellable.get(),
             [](GObject*, GAsyncResult* result, gpointer userData) {
@@ -91,6 +93,12 @@ void GeoclueGeolocationProvider::stop()
     g_cancellable_cancel(m_cancellable.get());
     m_cancellable = nullptr;
     stopClient();
+    g_cancellable_cancel(m_cancellable_start.get());
+    m_cancellable_start = nullptr;
+    g_cancellable_cancel(m_cancellable_setup.get());
+    m_cancellable_setup = nullptr;
+    g_cancellable_cancel(m_cancellable_create.get());
+    m_cancellable_create = nullptr;
     destroyManagerLater();
 }
 
@@ -153,6 +161,8 @@ void GeoclueGeolocationProvider::createClient(const char* clientPath)
         return;
     }
 
+    g_cancellable_cancel(m_cancellable_create.get());
+    m_cancellable_create = adoptGRef(g_cancellable_new());
     g_dbus_proxy_new_for_bus(G_BUS_TYPE_SYSTEM, G_DBUS_PROXY_FLAGS_NONE, nullptr,
         "org.freedesktop.GeoClue2", clientPath, "org.freedesktop.GeoClue2.Client", m_cancellable.get(),
         [](GObject*, GAsyncResult* result, gpointer userData) {
diff --git a/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.h b/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.h
index 31d29091985f34a65134a2b0e7cb3ace1dae441d..571ceac8a4b291fa6e91eb8b17065c0aba908ac3 100644
--- a/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.h
+++ b/Source/WebKit/UIProcess/geoclue/GeoclueGeolocationProvider.h
@@ -71,6 +71,9 @@ private:
     GRefPtr<GDBusProxy> m_manager;
     GRefPtr<GDBusProxy> m_client;
     GRefPtr<GCancellable> m_cancellable;
+    GRefPtr<GCancellable> m_cancellable_start;
+    GRefPtr<GCancellable> m_cancellable_setup;
+    GRefPtr<GCancellable> m_cancellable_create;
     UpdateNotifyFunction m_updateNotifyFunction;
     RunLoop::Timer<GeoclueGeolocationProvider> m_destroyManagerLaterTimer;
 };
diff --git a/Source/WebKit/UIProcess/glib/InspectorPlaywrightAgentClientGLib.cpp b/Source/WebKit/UIProcess/glib/InspectorPlaywrightAgentClientGLib.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..31a4e32d4cf8442049f0bea04c817a40b801c1f7
--- /dev/null
+++ b/Source/WebKit/UIProcess/glib/InspectorPlaywrightAgentClientGLib.cpp
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorPlaywrightAgentClientGLib.h"
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorPlaywrightAgent.h"
+#include "WebKitBrowserInspectorPrivate.h"
+#include "WebKitWebContextPrivate.h"
+#include "WebKitWebsiteDataManagerPrivate.h"
+#include "WebKitWebViewPrivate.h"
+#include "WebPageProxy.h"
+#include <wtf/HashMap.h>
+#include <wtf/RefPtr.h>
+#include <wtf/text/StringView.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebKit {
+
+static WebCore::SoupNetworkProxySettings parseRawProxySettings(const String& proxyServer, const char* const* ignoreHosts)
+{
+    WebCore::SoupNetworkProxySettings settings;
+    if (proxyServer.isEmpty())
+        return settings;
+
+    settings.mode = WebCore::SoupNetworkProxySettings::Mode::Custom;
+    settings.defaultProxyURL = proxyServer.utf8();
+    settings.ignoreHosts.reset(g_strdupv(const_cast<char**>(ignoreHosts)));
+    return settings;
+}
+
+static WebCore::SoupNetworkProxySettings parseProxySettings(const String& proxyServer, const String& proxyBypassList)
+{
+    Vector<const char*> ignoreHosts;
+    if (!proxyBypassList.isEmpty()) {
+        Vector<String> tokens = proxyBypassList.split(',');
+        Vector<CString> protectTokens;
+        for (String token : tokens) {
+            CString cstr = token.utf8();
+            ignoreHosts.append(cstr.data());
+            protectTokens.append(WTFMove(cstr));
+        }
+    }
+    ignoreHosts.append(nullptr);
+    return parseRawProxySettings(proxyServer, ignoreHosts.data());
+}
+
+InspectorPlaywrightAgentClientGlib::InspectorPlaywrightAgentClientGlib(const WTF::String& proxyURI, const char* const* ignoreHosts)
+    : m_proxySettings(parseRawProxySettings(proxyURI, ignoreHosts))
+{
+}
+
+RefPtr<WebPageProxy> InspectorPlaywrightAgentClientGlib::createPage(WTF::String& error, const BrowserContext& browserContext)
+{
+    auto sessionID = browserContext.dataStore->sessionID();
+    WebKitWebContext* context = m_idToContext.get(sessionID);
+    if (!context && !browserContext.dataStore->isPersistent()) {
+        ASSERT_NOT_REACHED();
+        error = "Context with provided id not found";
+        return nullptr;
+    }
+
+    RefPtr<WebPageProxy> page = webkitBrowserInspectorCreateNewPageInContext(context);
+    if (page == nullptr) {
+        error = "Failed to create new page in the context";
+        return nullptr;
+    }
+
+    if (context == nullptr && sessionID != page->sessionID()) {
+        ASSERT_NOT_REACHED();
+        error = " Failed to create new page in default context";
+        return nullptr;
+    }
+
+    return page;
+}
+
+void InspectorPlaywrightAgentClientGlib::closeBrowser()
+{
+    m_idToContext.clear();
+    webkitBrowserInspectorQuitApplication();
+    if (webkitWebContextExistingCount() > 1)
+        fprintf(stderr, "LEAK: %d contexts are still alive when closing browser\n", webkitWebContextExistingCount());
+}
+
+static PAL::SessionID sessionIDFromContext(WebKitWebContext* context)
+{
+    WebKitWebsiteDataManager* data_manager = webkit_web_context_get_website_data_manager(context);
+    WebsiteDataStore& websiteDataStore = webkitWebsiteDataManagerGetDataStore(data_manager);
+    return websiteDataStore.sessionID();
+}
+
+std::unique_ptr<BrowserContext> InspectorPlaywrightAgentClientGlib::createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList)
+{
+    GRefPtr<WebKitWebsiteDataManager> data_manager = adoptGRef(webkit_website_data_manager_new_ephemeral());
+    GRefPtr<WebKitWebContext> context = adoptGRef(WEBKIT_WEB_CONTEXT(g_object_new(WEBKIT_TYPE_WEB_CONTEXT, "website-data-manager", data_manager.get(), "process-swap-on-cross-site-navigation-enabled", true, nullptr)));
+    if (!context) {
+        error = "Failed to create GLib ephemeral context";
+        return nullptr;
+    }
+    auto browserContext = std::make_unique<BrowserContext>();
+    browserContext->processPool = &webkitWebContextGetProcessPool(context.get());
+    browserContext->dataStore = &webkitWebsiteDataManagerGetDataStore(data_manager.get());
+    PAL::SessionID sessionID = sessionIDFromContext(context.get());
+    m_idToContext.set(sessionID, WTFMove(context));
+
+    if (!proxyServer.isEmpty()) {
+        WebCore::SoupNetworkProxySettings contextProxySettings = parseProxySettings(proxyServer, proxyBypassList);
+        browserContext->dataStore->setNetworkProxySettings(WTFMove(contextProxySettings));
+    } else {
+        browserContext->dataStore->setNetworkProxySettings(WebCore::SoupNetworkProxySettings(m_proxySettings));
+    }
+    return browserContext;
+}
+
+void InspectorPlaywrightAgentClientGlib::deleteBrowserContext(WTF::String& error, PAL::SessionID sessionID)
+{
+    m_idToContext.remove(sessionID);
+}
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/glib/InspectorPlaywrightAgentClientGLib.h b/Source/WebKit/UIProcess/glib/InspectorPlaywrightAgentClientGLib.h
new file mode 100644
index 0000000000000000000000000000000000000000..8006336003a4512b4c63bc8272d4b3507bb63159
--- /dev/null
+++ b/Source/WebKit/UIProcess/glib/InspectorPlaywrightAgentClientGLib.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorPlaywrightAgentClient.h"
+#include <WebCore/SoupNetworkProxySettings.h>
+#include "WebKitWebContext.h"
+#include <wtf/Forward.h>
+#include <wtf/HashMap.h>
+#include <wtf/glib/GRefPtr.h>
+#include <wtf/text/StringHash.h>
+
+namespace WebKit {
+
+class InspectorPlaywrightAgentClientGlib : public InspectorPlaywrightAgentClient {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    InspectorPlaywrightAgentClientGlib(const WTF::String& proxyURI, const char* const* ignoreHosts);
+    ~InspectorPlaywrightAgentClientGlib() override = default;
+
+    RefPtr<WebPageProxy> createPage(WTF::String& error, const BrowserContext&) override;
+    void closeBrowser() override;
+    std::unique_ptr<BrowserContext> createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList) override;
+    void deleteBrowserContext(WTF::String& error, PAL::SessionID) override;
+
+private:
+    WebKitWebContext* findContext(WTF::String& error, PAL::SessionID);
+
+    HashMap<PAL::SessionID, GRefPtr<WebKitWebContext>> m_idToContext;
+    WebCore::SoupNetworkProxySettings m_proxySettings;
+};
+
+} // namespace API
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/gtk/AcceleratedBackingStore.h b/Source/WebKit/UIProcess/gtk/AcceleratedBackingStore.h
index 39aeff71fe05354cf63d3b3701d363642d63aca4..32e96cdd0bdbd8c5dcde43fdf60052ac13a226f7 100644
--- a/Source/WebKit/UIProcess/gtk/AcceleratedBackingStore.h
+++ b/Source/WebKit/UIProcess/gtk/AcceleratedBackingStore.h
@@ -28,6 +28,7 @@
 #include <wtf/Noncopyable.h>
 
 typedef struct _cairo cairo_t;
+typedef struct _cairo_surface cairo_surface_t;
 
 #if USE(GTK4)
 typedef struct _GdkSnapshot GdkSnapshot;
@@ -56,6 +57,8 @@ public:
 #else
     virtual bool paint(cairo_t*, const WebCore::IntRect&) = 0;
 #endif
+    virtual cairo_surface_t* surface() { return nullptr; }
+
     virtual void realize() { };
     virtual void unrealize() { };
     virtual bool makeContextCurrent() { return false; }
diff --git a/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreX11.h b/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreX11.h
index 054e80bd900cf16d69801e8102ca989ff0563e1d..8245d7ed58008dbb6152e55e619e4331d30ae674 100644
--- a/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreX11.h
+++ b/Source/WebKit/UIProcess/gtk/AcceleratedBackingStoreX11.h
@@ -52,6 +52,7 @@ private:
 #else
     bool paint(cairo_t*, const WebCore::IntRect&) override;
 #endif
+    cairo_surface_t* surface() override { return m_surface.get(); }
 
     RefPtr<cairo_surface_t> m_surface;
     WebCore::XUniqueDamage m_damage;
diff --git a/Source/WebKit/UIProcess/gtk/InspectorTargetProxyGtk.cpp b/Source/WebKit/UIProcess/gtk/InspectorTargetProxyGtk.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8a86cc348bc210b71bb463dcb3057f575ad7c1d3
--- /dev/null
+++ b/Source/WebKit/UIProcess/gtk/InspectorTargetProxyGtk.cpp
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorTargetProxy.h"
+
+#include "WebPageProxy.h"
+#include <WebCore/GtkUtilities.h>
+#include <gtk/gtk.h>
+
+namespace WebKit {
+
+void InspectorTargetProxy::platformActivate(String& error) const
+{
+    GtkWidget* parent = gtk_widget_get_toplevel(m_page.viewWidget());
+    if (WebCore::widgetIsOnscreenToplevelWindow(parent))
+        gtk_window_present(GTK_WINDOW(parent));
+    else
+        error = "The view is not on screen";
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/gtk/WebPageInspectorEmulationAgentGtk.cpp b/Source/WebKit/UIProcess/gtk/WebPageInspectorEmulationAgentGtk.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e5e25acebabb76a05a77db02a99f1267bd99a3af
--- /dev/null
+++ b/Source/WebKit/UIProcess/gtk/WebPageInspectorEmulationAgentGtk.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "DrawingAreaProxyCoordinatedGraphics.h"
+#include "WebPageInspectorEmulationAgent.h"
+#include "WebPageProxy.h"
+#include <WebCore/IntSize.h>
+#include <gtk/gtk.h>
+
+namespace WebKit {
+void WebPageInspectorEmulationAgent::platformSetSize(int width, int height, Function<void (const String& error)>&& callback)
+{
+    GtkWidget* viewWidget = m_page.viewWidget();
+    GtkWidget* window = gtk_widget_get_toplevel(viewWidget);
+    if (!window) {
+        callback("Cannot find parent window"_s);
+        return;
+    }
+    if (!GTK_IS_WINDOW(window)) {
+        callback("Toplevel is not a window"_s);
+        return;
+    }
+    GtkAllocation viewAllocation;
+    gtk_widget_get_allocation(viewWidget, &viewAllocation);
+    if (viewAllocation.width == width && viewAllocation.height == height) {
+        callback(String());
+        return;
+    }
+
+    GtkAllocation windowAllocation;
+    gtk_widget_get_allocation(window, &windowAllocation);
+
+    width += windowAllocation.width - viewAllocation.width;
+    height += windowAllocation.height - viewAllocation.height;
+
+    if (auto* drawingArea = static_cast<DrawingAreaProxyCoordinatedGraphics*>(m_page.drawingArea())) {
+        drawingArea->waitForSizeUpdate([callback = WTFMove(callback)]() {
+            callback(String());
+        });
+    } else {
+        callback("No backing store for window"_s);
+    }
+    gtk_window_resize(GTK_WINDOW(window), width, height);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/gtk/WebPageInspectorInputAgentGtk.cpp b/Source/WebKit/UIProcess/gtk/WebPageInspectorInputAgentGtk.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d0f9827544994e450e24e3f7a427c35eeff94d67
--- /dev/null
+++ b/Source/WebKit/UIProcess/gtk/WebPageInspectorInputAgentGtk.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebPageInspectorInputAgent.h"
+
+#include "KeyBindingTranslator.h"
+#include "NativeWebKeyboardEvent.h"
+#include "WebPageProxy.h"
+#include <WebCore/PlatformKeyboardEvent.h>
+
+namespace WebKit {
+
+static Vector<String> commandsForKeyEvent(GdkEventType type, unsigned keyVal, unsigned state)
+{
+    ASSERT(type == GDK_KEY_PRESS || type == GDK_KEY_RELEASE);
+
+    GUniquePtr<GdkEvent> event(gdk_event_new(type));
+    event->key.keyval = keyVal;
+    event->key.time = GDK_CURRENT_TIME;
+    event->key.state = state;
+    // When synthesizing an event, an invalid hardware_keycode value can cause it to be badly processed by GTK+.
+    GUniqueOutPtr<GdkKeymapKey> keys;
+    int keysCount;
+    if (gdk_keymap_get_entries_for_keyval(gdk_keymap_get_default(), keyVal, &keys.outPtr(), &keysCount) && keysCount)
+        event->key.hardware_keycode = keys.get()[0].keycode;
+    return KeyBindingTranslator().commandsForKeyEvent(&event->key);
+}
+
+static unsigned modifiersToEventState(OptionSet<WebEvent::Modifier> modifiers)
+{
+    unsigned state = 0;
+    if (modifiers.contains(WebEvent::Modifier::ControlKey))
+        state |= GDK_CONTROL_MASK;
+    if (modifiers.contains(WebEvent::Modifier::ShiftKey))
+        state |= GDK_SHIFT_MASK;
+    if (modifiers.contains(WebEvent::Modifier::AltKey))
+        state |= GDK_META_MASK;
+    if (modifiers.contains(WebEvent::Modifier::CapsLockKey))
+        state |= GDK_LOCK_MASK;
+    return state;
+}
+
+void WebPageInspectorInputAgent::platformDispatchKeyEvent(WebKeyboardEvent::Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<WebEvent::Modifier> modifiers, Vector<String>& macCommands, WallTime timestamp)
+{
+    Vector<String> commands;
+    const guint keyVal = WebCore::PlatformKeyboardEvent::gdkKeyCodeForWindowsKeyCode(windowsVirtualKeyCode);
+    if (keyVal) {
+        GdkEventType event = GDK_NOTHING;
+        switch (type)
+        {
+        case WebKeyboardEvent::KeyDown:
+            event = GDK_KEY_PRESS;
+            break;
+        case WebKeyboardEvent::KeyUp:
+            event = GDK_KEY_RELEASE;
+            break;
+        default:
+            fprintf(stderr, "Unsupported event type = %d\n", type);
+            break;
+        }
+        unsigned state = modifiersToEventState(modifiers);
+        commands = commandsForKeyEvent(event, keyVal, state);
+    }
+    NativeWebKeyboardEvent event(
+        type,
+        text,
+        unmodifiedText,
+        key,
+        code,
+        keyIdentifier,
+        windowsVirtualKeyCode,
+        nativeVirtualKeyCode,
+        isAutoRepeat,
+        isKeypad,
+        isSystemKey,
+        modifiers,
+        timestamp,
+        WTFMove(commands));
+    m_page.handleKeyboardEvent(event);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm b/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
index b6ab962b733439232bf7dd92c96a6b212c1a86d2..c72d9b533a6ca160422f3ebbf5b13e81f2ed8f5f 100644
--- a/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
+++ b/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
@@ -435,6 +435,8 @@ IntRect PageClientImpl::rootViewToAccessibilityScreen(const IntRect& rect)
     
 void PageClientImpl::doneWithKeyEvent(const NativeWebKeyboardEvent& event, bool eventWasHandled)
 {
+    if (!event.nativeEvent())
+        return;
     [m_contentView _didHandleKeyEvent:event.nativeEvent() eventWasHandled:eventWasHandled];
 }
 
diff --git a/Source/WebKit/UIProcess/mac/InspectorPlaywrightAgentClientMac.h b/Source/WebKit/UIProcess/mac/InspectorPlaywrightAgentClientMac.h
new file mode 100644
index 0000000000000000000000000000000000000000..a16815a6759da61a6a61e3d79058228af887fd7c
--- /dev/null
+++ b/Source/WebKit/UIProcess/mac/InspectorPlaywrightAgentClientMac.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "InspectorPlaywrightAgentClient.h"
+#include <wtf/Forward.h>
+
+OBJC_PROTOCOL(_WKBrowserInspectorDelegate);
+
+namespace WebKit {
+
+class InspectorPlaywrightAgentClientMac : public InspectorPlaywrightAgentClient {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    InspectorPlaywrightAgentClientMac(_WKBrowserInspectorDelegate* delegate);
+    ~InspectorPlaywrightAgentClientMac() override = default;
+
+    RefPtr<WebPageProxy> createPage(WTF::String& error, const BrowserContext&) override;
+    void closeBrowser() override;
+    std::unique_ptr<BrowserContext> createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList) override;
+    void deleteBrowserContext(WTF::String& error, PAL::SessionID) override;
+
+private:
+    _WKBrowserInspectorDelegate* delegate_;
+};
+
+
+} // namespace API
diff --git a/Source/WebKit/UIProcess/mac/InspectorPlaywrightAgentClientMac.mm b/Source/WebKit/UIProcess/mac/InspectorPlaywrightAgentClientMac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..8e588f7b8c8c29fb53dd37ea41d46f3d753077fd
--- /dev/null
+++ b/Source/WebKit/UIProcess/mac/InspectorPlaywrightAgentClientMac.mm
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "InspectorPlaywrightAgentClientMac.h"
+
+#import <wtf/RefPtr.h>
+#import <wtf/text/WTFString.h>
+#import "WebPageProxy.h"
+#import "WebProcessPool.h"
+#import "WebsiteDataStore.h"
+#import "_WKBrowserInspector.h"
+#import "WKProcessPoolInternal.h"
+#import "WKWebsiteDataStoreInternal.h"
+#import "WKWebView.h"
+#import "WKWebViewInternal.h"
+
+namespace WebKit {
+
+InspectorPlaywrightAgentClientMac::InspectorPlaywrightAgentClientMac(_WKBrowserInspectorDelegate* delegate)
+  : delegate_(delegate)
+{
+}
+
+RefPtr<WebPageProxy> InspectorPlaywrightAgentClientMac::createPage(WTF::String& error, const BrowserContext& browserContext)
+{
+    auto sessionID = browserContext.dataStore->sessionID();
+    WKWebView *webView = [delegate_ createNewPage:sessionID.toUInt64()];
+    if (!webView) {
+        error = "Internal error: can't create page in given context"_s;
+        return nil;
+    }
+    return [webView _page].get();
+}
+
+void InspectorPlaywrightAgentClientMac::closeBrowser()
+{
+    [delegate_ quit];
+}
+
+std::unique_ptr<BrowserContext> InspectorPlaywrightAgentClientMac::createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList)
+{
+    _WKBrowserContext* wkBrowserContext = [[delegate_ createBrowserContext:proxyServer WithBypassList:proxyBypassList] autorelease];
+    auto browserContext = std::make_unique<BrowserContext>();
+    browserContext->processPool = &static_cast<WebProcessPool&>([[wkBrowserContext processPool] _apiObject]);
+    browserContext->dataStore = &static_cast<WebsiteDataStore&>([[wkBrowserContext dataStore] _apiObject]);
+    return browserContext;
+}
+
+void InspectorPlaywrightAgentClientMac::deleteBrowserContext(WTF::String& error, PAL::SessionID sessionID)
+{
+    [delegate_ deleteBrowserContext:sessionID.toUInt64()];
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/mac/InspectorTargetProxyMac.mm b/Source/WebKit/UIProcess/mac/InspectorTargetProxyMac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..721826c8c98fc85b68a4f45deaee69c1219a7254
--- /dev/null
+++ b/Source/WebKit/UIProcess/mac/InspectorTargetProxyMac.mm
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "InspectorTargetProxy.h"
+#import "WebPageProxy.h"
+
+#if PLATFORM(MAC)
+
+namespace WebKit {
+
+void InspectorTargetProxy::platformActivate(String& error) const
+{
+    NSWindow* window = m_page.platformWindow();
+    [window makeKeyAndOrderFront:nil];
+}
+
+} // namespace WebKit
+
+#endif
diff --git a/Source/WebKit/UIProcess/mac/PageClientImplMac.h b/Source/WebKit/UIProcess/mac/PageClientImplMac.h
index 81a2c861c9ad71b83221d9a978e67e7379617a2c..8b070646433218dc41d7ce2fa85f5d8f71be436e 100644
--- a/Source/WebKit/UIProcess/mac/PageClientImplMac.h
+++ b/Source/WebKit/UIProcess/mac/PageClientImplMac.h
@@ -53,6 +53,8 @@ class PageClientImpl final : public PageClientImplCocoa
 #endif
     {
 public:
+    static void setHeadless(bool headless);
+
     PageClientImpl(NSView *, WKWebView *);
     virtual ~PageClientImpl();
 
@@ -119,6 +121,7 @@ private:
     WebCore::IntRect rootViewToScreen(const WebCore::IntRect&) override;
 #if PLATFORM(MAC)
     WebCore::IntRect rootViewToWindow(const WebCore::IntRect&) override;
+    int browserToolbarHeight() const override;
 #endif
     WebCore::IntPoint accessibilityScreenToRootView(const WebCore::IntPoint&) override;
     WebCore::IntRect rootViewToAccessibilityScreen(const WebCore::IntRect&) override;
@@ -158,6 +161,9 @@ private:
     void updateAcceleratedCompositingMode(const LayerTreeContext&) override;
     void didFirstLayerFlush(const LayerTreeContext&) override;
 
+// Paywright begin
+    RetainPtr<CGImageRef> takeSnapshotForAutomation() override;
+// Paywright end
     RefPtr<ViewSnapshot> takeViewSnapshot(Optional<WebCore::IntRect>&&) override;
     void wheelEventWasNotHandledByWebCore(const NativeWebWheelEvent&) override;
 #if ENABLE(MAC_GESTURE_EVENTS)
@@ -212,6 +218,10 @@ private:
     void beganExitFullScreen(const WebCore::IntRect& initialFrame, const WebCore::IntRect& finalFrame) override;
 #endif
 
+#if ENABLE(TOUCH_EVENTS)
+    void doneWithTouchEvent(const NativeWebTouchEvent&, bool wasEventHandled) override;
+#endif
+
     void navigationGestureDidBegin() override;
     void navigationGestureWillEnd(bool willNavigate, WebBackForwardListItem&) override;
     void navigationGestureDidEnd(bool willNavigate, WebBackForwardListItem&) override;
diff --git a/Source/WebKit/UIProcess/mac/PageClientImplMac.mm b/Source/WebKit/UIProcess/mac/PageClientImplMac.mm
index 50469a524949a69e9419280ed2a4f8c2bc1e5f23..2bc6e32b486f4ae244a6ccb870a88de9cc17129e 100644
--- a/Source/WebKit/UIProcess/mac/PageClientImplMac.mm
+++ b/Source/WebKit/UIProcess/mac/PageClientImplMac.mm
@@ -81,6 +81,7 @@
 #import <WebCore/TextUndoInsertionMarkupMac.h>
 #import <WebCore/ValidationBubble.h>
 #import <WebCore/WebCoreCALayerExtras.h>
+#import <WebCore/NotImplemented.h>
 #import <pal/spi/mac/NSApplicationSPI.h>
 #import <wtf/ProcessPrivilege.h>
 #import <wtf/RetainPtr.h>
@@ -107,6 +108,13 @@ namespace WebKit {
 
 using namespace WebCore;
 
+static bool _headless = false;
+
+// static
+void PageClientImpl::setHeadless(bool headless) {
+    _headless = headless;
+}
+
 PageClientImpl::PageClientImpl(NSView *view, WKWebView *webView)
     : PageClientImplCocoa(webView)
     , m_view(view)
@@ -160,6 +168,9 @@ NSWindow *PageClientImpl::activeWindow() const
 
 bool PageClientImpl::isViewWindowActive()
 {
+    if (_headless)
+        return true;
+
     ASSERT(hasProcessPrivilege(ProcessPrivilege::CanCommunicateWithWindowServer));
     NSWindow *activeViewWindow = activeWindow();
     return activeViewWindow.isKeyWindow || (activeViewWindow && [NSApp keyWindow] == activeViewWindow);
@@ -167,6 +178,9 @@ bool PageClientImpl::isViewWindowActive()
 
 bool PageClientImpl::isViewFocused()
 {
+    if (_headless)
+        return true;
+
     // FIXME: This is called from the WebPageProxy constructor before we have a WebViewImpl.
     // Once WebViewImpl and PageClient merge, this won't be a problem.
     if (!m_impl)
@@ -190,6 +204,9 @@ void PageClientImpl::makeFirstResponder()
     
 bool PageClientImpl::isViewVisible()
 {
+    if (_headless)
+        return true;
+
     NSView *activeView = this->activeView();
     NSWindow *activeViewWindow = activeWindow();
 
@@ -273,7 +290,8 @@ void PageClientImpl::didRelaunchProcess()
 
 void PageClientImpl::preferencesDidChange()
 {
-    m_impl->preferencesDidChange();
+    if (m_impl)
+        m_impl->preferencesDidChange();
 }
 
 void PageClientImpl::toolTipChanged(const String& oldToolTip, const String& newToolTip)
@@ -466,6 +484,15 @@ IntRect PageClientImpl::rootViewToWindow(const WebCore::IntRect& rect)
     return enclosingIntRect(tempRect);
 }
 
+int PageClientImpl::browserToolbarHeight() const
+{
+    // There are no controls in headless mode.
+    if (_headless)
+        return 0;
+
+    return 55;
+}
+
 IntPoint PageClientImpl::accessibilityScreenToRootView(const IntPoint& point)
 {
     return screenToRootView(point);
@@ -478,11 +505,15 @@ IntRect PageClientImpl::rootViewToAccessibilityScreen(const IntRect& rect)
 
 void PageClientImpl::doneWithKeyEvent(const NativeWebKeyboardEvent& event, bool eventWasHandled)
 {
+    if (!event.nativeEvent())
+        return;
     m_impl->doneWithKeyEvent(event.nativeEvent(), eventWasHandled);
 }
 
 RefPtr<WebPopupMenuProxy> PageClientImpl::createPopupMenuProxy(WebPageProxy& page)
 {
+    if (_headless)
+        return nullptr;
     return WebPopupMenuProxyMac::create(m_view, page);
 }
 
@@ -602,6 +633,12 @@ CALayer *PageClientImpl::acceleratedCompositingRootLayer() const
     return m_impl->acceleratedCompositingRootLayer();
 }
 
+// Paywright begin
+RetainPtr<CGImageRef> PageClientImpl::takeSnapshotForAutomation() {
+    return m_impl->takeSnapshotForAutomation();
+}
+// Paywright begin
+
 RefPtr<ViewSnapshot> PageClientImpl::takeViewSnapshot(Optional<WebCore::IntRect>&&)
 {
     return m_impl->takeViewSnapshot();
@@ -780,6 +817,13 @@ void PageClientImpl::beganExitFullScreen(const IntRect& initialFrame, const IntR
 
 #endif // ENABLE(FULLSCREEN_API)
 
+#if ENABLE(TOUCH_EVENTS)
+void PageClientImpl::doneWithTouchEvent(const NativeWebTouchEvent& event, bool wasEventHandled)
+{
+    notImplemented();
+}
+#endif // ENABLE(TOUCH_EVENTS)
+
 void PageClientImpl::navigationGestureDidBegin()
 {
     m_impl->dismissContentRelativeChildWindowsWithAnimation(true);
@@ -946,6 +990,9 @@ void PageClientImpl::didRestoreScrollPosition()
 
 bool PageClientImpl::windowIsFrontWindowUnderMouse(const NativeWebMouseEvent& event)
 {
+    // Simulated event.
+    if (!event.nativeEvent())
+        return false;
     return m_impl->windowIsFrontWindowUnderMouse(event.nativeEvent());
 }
 
diff --git a/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.h b/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.h
index 0bb07e679f30e7b3682b3736b5372cbbb2d31ec8..cc0740c7d88d11d419cf2ca51cbc00b193531100 100644
--- a/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.h
+++ b/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.h
@@ -62,6 +62,7 @@ private:
     void show() override;
     void showContextMenuWithItems(Vector<Ref<WebContextMenuItem>>&&) override;
     void useContextMenuItems(Vector<Ref<WebContextMenuItem>>&&) override;
+    void hide() override;
 
     void getContextMenuItem(const WebContextMenuItemData&, CompletionHandler<void(NSMenuItem *)>&&);
     void getContextMenuFromItems(const Vector<WebContextMenuItemData>&, CompletionHandler<void(NSMenu *)>&&);
diff --git a/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.mm b/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.mm
index 5ad887b13fb41224383e40014b48910cbe2e7dcd..b6a2b93f13bdc6be626bcbb9282ac26da1415049 100644
--- a/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.mm
+++ b/Source/WebKit/UIProcess/mac/WebContextMenuProxyMac.mm
@@ -326,6 +326,12 @@ void WebContextMenuProxyMac::getShareMenuItem(CompletionHandler<void(NSMenuItem
 }
 #endif
 
+void WebContextMenuProxyMac::hide()
+{
+    if (m_menu)
+        [m_menu cancelTracking];
+}
+
 void WebContextMenuProxyMac::show()
 {
 #if ENABLE(SERVICE_CONTROLS)
diff --git a/Source/WebKit/UIProcess/mac/WebPageInspectorEmulationAgentMac.mm b/Source/WebKit/UIProcess/mac/WebPageInspectorEmulationAgentMac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..6113f4cd60a5d72b8ead61176cb43200803478ed
--- /dev/null
+++ b/Source/WebKit/UIProcess/mac/WebPageInspectorEmulationAgentMac.mm
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "WebPageInspectorEmulationAgent.h"
+
+#import "WebPageProxy.h"
+
+namespace WebKit {
+
+void WebPageInspectorEmulationAgent::platformSetSize(int width, int height, Function<void (const String& error)>&& callback)
+{
+    NSWindow* window = m_page.platformWindow();
+    NSRect windowRect = [window frame];
+    NSRect viewRect = window.contentLayoutRect;
+    windowRect.size.width += width - viewRect.size.width;
+    windowRect.size.height += height - viewRect.size.height;
+    [window setFrame:windowRect display:YES animate:NO];
+    callback(String());
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/mac/WebPageInspectorInputAgentMac.mm b/Source/WebKit/UIProcess/mac/WebPageInspectorInputAgentMac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..726053d74b9283d734d8699daca0e5e7f8893eca
--- /dev/null
+++ b/Source/WebKit/UIProcess/mac/WebPageInspectorInputAgentMac.mm
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#import "config.h"
+#import "NativeWebMouseEvent.h"
+#import "WebPageInspectorInputAgent.h"
+#import "WebPageProxy.h"
+#import <WebCore/IntPoint.h>
+#import <WebCore/IntSize.h>
+#import "NativeWebKeyboardEvent.h"
+
+namespace WebKit {
+
+using namespace WebCore;
+
+void WebPageInspectorInputAgent::platformDispatchMouseEvent(const String& type, int x, int y, Optional<int>&& optionalModifiers, const String& button, Optional<int>&& optionalClickCount) {
+    IntPoint locationInWindow(x, y);
+
+    NSEventModifierFlags modifiers = 0;
+    if (optionalModifiers) {
+        int inputModifiers = *optionalModifiers;
+        if (inputModifiers & 1)
+            modifiers |= NSEventModifierFlagShift;
+        if (inputModifiers & 2)
+            modifiers |= NSEventModifierFlagControl;
+        if (inputModifiers & 4)
+            modifiers |= NSEventModifierFlagOption;
+        if (inputModifiers & 8)
+            modifiers |= NSEventModifierFlagCommand;
+    }
+    int clickCount = optionalClickCount ? *optionalClickCount : 0;
+
+    NSTimeInterval timestamp = [NSDate timeIntervalSinceReferenceDate];
+    NSWindow *window = m_page.platformWindow();
+    NSInteger windowNumber = window.windowNumber;
+
+    NSEventType downEventType = (NSEventType)0;
+    NSEventType dragEventType = (NSEventType)0;
+    NSEventType upEventType = (NSEventType)0;
+
+    if (!button || button == "none") {
+        downEventType = NSEventTypeMouseMoved;
+        dragEventType = NSEventTypeMouseMoved;
+        upEventType = NSEventTypeMouseMoved;
+    } else if (button == "left") {
+        downEventType = NSEventTypeLeftMouseDown;
+        dragEventType = NSEventTypeLeftMouseDragged;
+        upEventType = NSEventTypeLeftMouseUp;
+    } else if (button == "middle") {
+        downEventType = NSEventTypeOtherMouseDown;
+        dragEventType = NSEventTypeLeftMouseDragged;
+        upEventType = NSEventTypeOtherMouseUp;
+    } else if (button == "right") {
+        downEventType = NSEventTypeRightMouseDown;
+        upEventType = NSEventTypeRightMouseUp;
+    }
+
+    NSInteger eventNumber = 0;
+
+    NSEvent* event = nil;
+    if (type == "move") {
+        event = [NSEvent mouseEventWithType:dragEventType location:locationInWindow modifierFlags:modifiers timestamp:timestamp windowNumber:windowNumber context:nil eventNumber:eventNumber clickCount:clickCount pressure:0.0f];
+    } else if (type == "down") {
+        event = [NSEvent mouseEventWithType:downEventType location:locationInWindow modifierFlags:modifiers timestamp:timestamp windowNumber:windowNumber context:nil eventNumber:eventNumber clickCount:clickCount pressure:WebCore::ForceAtClick];
+    } else if (type == "up") {
+        event = [NSEvent mouseEventWithType:upEventType location:locationInWindow modifierFlags:modifiers timestamp:timestamp windowNumber:windowNumber context:nil eventNumber:eventNumber clickCount:clickCount pressure:0.0f];
+    }
+
+    if (event) {
+        NativeWebMouseEvent nativeEvent(event, nil, [window contentView]);
+        m_page.handleMouseEvent(nativeEvent);
+    }
+}
+
+void WebPageInspectorInputAgent::platformDispatchKeyEvent(WebKeyboardEvent::Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<WebEvent::Modifier> modifiers, Vector<String>& commands, WallTime timestamp)
+{
+    Vector<WebCore::KeypressCommand> macCommands;
+    for (const String& command : commands) {
+      m_page.registerKeypressCommandName(command);
+      macCommands.append(WebCore::KeypressCommand(command.utf8().data()));
+    }
+    if (text.length() > 0 && macCommands.size() == 0)
+      macCommands.append(WebCore::KeypressCommand("insertText:", text));
+    NativeWebKeyboardEvent event(
+        type,
+        text,
+        unmodifiedText,
+        key,
+        code,
+        keyIdentifier,
+        windowsVirtualKeyCode,
+        nativeVirtualKeyCode,
+        isAutoRepeat,
+        isKeypad,
+        isSystemKey,
+        modifiers,
+        timestamp,
+        WTFMove(macCommands));
+    m_page.handleKeyboardEvent(event);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/win/InspectorPlaywrightAgentClientWin.cpp b/Source/WebKit/UIProcess/win/InspectorPlaywrightAgentClientWin.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..dd7fe0604188bb025f361f1c44685e38bbf935ca
--- /dev/null
+++ b/Source/WebKit/UIProcess/win/InspectorPlaywrightAgentClientWin.cpp
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorPlaywrightAgentClientWin.h"
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "APIPageConfiguration.h"
+#include "APIProcessPoolConfiguration.h"
+#include "InspectorPlaywrightAgent.h"
+#include "WebPageProxy.h"
+#include "WebsiteDataStore.h"
+#include "WebPreferences.h"
+#include "WebProcessPool.h"
+#include "WebView.h"
+#include "WKAPICast.h"
+#include <WebCore/CurlProxySettings.h>
+#include <wtf/HashMap.h>
+#include <wtf/RefPtr.h>
+#include <wtf/text/StringView.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebKit {
+
+InspectorPlaywrightAgentClientWin::InspectorPlaywrightAgentClientWin(ConfigureDataStoreCallback configureDataStore, CreatePageCallback createPage, QuitCallback quit)
+    : m_configureDataStore(configureDataStore)
+    , m_createPage(createPage)
+    , m_quit(quit)
+{
+}
+
+RefPtr<WebPageProxy> InspectorPlaywrightAgentClientWin::createPage(WTF::String& error, const BrowserContext& context)
+{
+    auto conf = API::PageConfiguration::create();
+    conf->setProcessPool(context.processPool.get());
+    conf->setWebsiteDataStore(context.dataStore.get());
+    return toImpl(m_createPage(toAPI(&conf.get())));
+}
+
+void InspectorPlaywrightAgentClientWin::closeBrowser()
+{
+    m_quit();
+}
+
+std::unique_ptr<BrowserContext> InspectorPlaywrightAgentClientWin::createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList)
+{
+    auto config = API::ProcessPoolConfiguration::create();
+    auto browserContext = std::make_unique<BrowserContext>();
+    browserContext->processPool = WebKit::WebProcessPool::create(config);
+    browserContext->dataStore = WebKit::WebsiteDataStore::createNonPersistent();
+    m_configureDataStore(toAPI(browserContext->dataStore.get()));
+    if (!proxyServer.isEmpty()) {
+        URL proxyURL = URL(URL(), proxyServer);
+        WebCore::CurlProxySettings settings(WTFMove(proxyURL), String(proxyBypassList));
+        browserContext->dataStore->setNetworkProxySettings(WTFMove(settings));
+    }
+    PAL::SessionID sessionID = browserContext->dataStore->sessionID();
+    return browserContext;
+}
+
+void InspectorPlaywrightAgentClientWin::deleteBrowserContext(WTF::String& error, PAL::SessionID sessionID)
+{
+}
+
+} // namespace WebKit
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/win/InspectorPlaywrightAgentClientWin.h b/Source/WebKit/UIProcess/win/InspectorPlaywrightAgentClientWin.h
new file mode 100644
index 0000000000000000000000000000000000000000..df18883b2b7d22d73540cb084d3dd5291231097d
--- /dev/null
+++ b/Source/WebKit/UIProcess/win/InspectorPlaywrightAgentClientWin.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(REMOTE_INSPECTOR)
+
+#include "InspectorPlaywrightAgentClient.h"
+#include <WebKit/WKInspector.h>
+#include <wtf/Forward.h>
+#include <wtf/text/StringHash.h>
+
+typedef void (*ConfigureDataStoreCallback)(WKWebsiteDataStoreRef dataStore);
+typedef WKPageRef (*CreatePageCallback)(WKPageConfigurationRef configuration);
+typedef void (*QuitCallback)();
+
+namespace WebKit {
+
+class InspectorPlaywrightAgentClientWin : public InspectorPlaywrightAgentClient {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    InspectorPlaywrightAgentClientWin(ConfigureDataStoreCallback, CreatePageCallback, QuitCallback);
+    ~InspectorPlaywrightAgentClientWin() override = default;
+
+    RefPtr<WebPageProxy> createPage(WTF::String& error, const BrowserContext&) override;
+    void closeBrowser() override;
+    std::unique_ptr<BrowserContext> createBrowserContext(WTF::String& error, const WTF::String& proxyServer, const WTF::String& proxyBypassList) override;
+    void deleteBrowserContext(WTF::String& error, PAL::SessionID) override;
+
+private:
+    ConfigureDataStoreCallback m_configureDataStore;
+    CreatePageCallback m_createPage;
+    QuitCallback m_quit;
+};
+
+} // namespace API
+
+#endif // ENABLE(REMOTE_INSPECTOR)
diff --git a/Source/WebKit/UIProcess/win/InspectorTargetProxyWin.cpp b/Source/WebKit/UIProcess/win/InspectorTargetProxyWin.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..135a60361fa8fbf907382625e7c8dd4ea64ceb94
--- /dev/null
+++ b/Source/WebKit/UIProcess/win/InspectorTargetProxyWin.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorTargetProxy.h"
+#include "WebPageProxy.h"
+
+namespace WebKit {
+
+void InspectorTargetProxy::platformActivate(String& error) const
+{
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.cpp b/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.cpp
index 3dcd0ec35c92e37239208a8f5d4f461fbeaac3ce..84ba07c57f2abac1bd0ca5d0af2e7366ad036892 100644
--- a/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.cpp
+++ b/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.cpp
@@ -112,5 +112,11 @@ WebContextMenuProxyWin::~WebContextMenuProxyWin()
         ::DestroyMenu(m_menu);
 }
 
+void WebContextMenuProxyWin::hide()
+{
+    if (m_menu)
+        ::EndMenu();
+}
+
 } // namespace WebKit
 #endif // ENABLE(CONTEXT_MENUS)
diff --git a/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.h b/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.h
index 0c80d970c3f9a987faf620081c909f6c7021970d..1467e5481f7417913c0d12a1cb492d02b2a7d1b7 100644
--- a/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.h
+++ b/Source/WebKit/UIProcess/win/WebContextMenuProxyWin.h
@@ -47,6 +47,7 @@ public:
 private:
     WebContextMenuProxyWin(WebPageProxy&, ContextMenuContextData&&, const UserData&);
     void showContextMenuWithItems(Vector<Ref<WebContextMenuItem>>&&) override;
+    void hide() override;
 
     HMENU m_menu;
 };
diff --git a/Source/WebKit/UIProcess/win/WebPageInspectorEmulationAgentWin.cpp b/Source/WebKit/UIProcess/win/WebPageInspectorEmulationAgentWin.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..62b841fe1d0de2296e1c61e328cff564f5aa1c0f
--- /dev/null
+++ b/Source/WebKit/UIProcess/win/WebPageInspectorEmulationAgentWin.cpp
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebPageInspectorEmulationAgent.h"
+#include "WebPageProxy.h"
+
+namespace WebKit {
+
+void WebPageInspectorEmulationAgent::platformSetSize(int width, int height, Function<void (const String& error)>&& callback)
+{
+    HWND viewHwnd = m_page.viewWidget();
+    HWND windowHwnd = GetAncestor(viewHwnd, GA_ROOT);
+    RECT viewRect;
+    RECT windowRect;
+
+    if (!windowHwnd || !GetWindowRect(windowHwnd, &windowRect)) {
+        callback("Could not retrieve window size");
+        return;
+    }
+    if (!GetWindowRect(viewHwnd, &viewRect)) {
+        callback("Could retrieve view size");
+        return;
+    }
+
+    width += windowRect.right - windowRect.left - viewRect.right + viewRect.left;
+    height += windowRect.bottom - windowRect.top - viewRect.bottom + viewRect.top;
+
+    if (!SetWindowPos(windowHwnd, 0, 0, 0, width, height, SWP_NOCOPYBITS | SWP_NOSENDCHANGING | SWP_NOMOVE)) {
+        callback("Could not resize window");
+        return;
+    }
+    callback(String());
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/win/WebPageInspectorInputAgentWin.cpp b/Source/WebKit/UIProcess/win/WebPageInspectorInputAgentWin.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5cf8a010e9809e6a95741cdb7c2cbeb445ab638b
--- /dev/null
+++ b/Source/WebKit/UIProcess/win/WebPageInspectorInputAgentWin.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2020 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include "config.h"
+#include "WebPageInspectorInputAgent.h"
+
+#include "NativeWebKeyboardEvent.h"
+#include "WebPageProxy.h"
+#include <WebCore/PlatformKeyboardEvent.h>
+
+namespace WebKit {
+
+void WebPageInspectorInputAgent::platformDispatchKeyEvent(WebKeyboardEvent::Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<WebEvent::Modifier> modifiers, Vector<String>& macCommands, WallTime timestamp)
+{
+    NativeWebKeyboardEvent event(
+        type,
+        text,
+        unmodifiedText,
+        key,
+        code,
+        keyIdentifier,
+        windowsVirtualKeyCode,
+        nativeVirtualKeyCode,
+        isAutoRepeat,
+        isKeypad,
+        isSystemKey,
+        modifiers,
+        timestamp);
+    m_page.handleKeyboardEvent(event);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/wpe/InspectorTargetProxyWPE.cpp b/Source/WebKit/UIProcess/wpe/InspectorTargetProxyWPE.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7453194ca6f032ba86a4c67f5bf12688ab6ec1be
--- /dev/null
+++ b/Source/WebKit/UIProcess/wpe/InspectorTargetProxyWPE.cpp
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "InspectorTargetProxy.h"
+
+#include "WebPageProxy.h"
+#include <wpe/wpe.h>
+
+namespace WebKit {
+
+void InspectorTargetProxy::platformActivate(String& error) const
+{
+    struct wpe_view_backend* backend = m_page.viewBackend();
+    wpe_view_backend_add_activity_state(backend, wpe_view_activity_state_visible | wpe_view_activity_state_focused | wpe_view_activity_state_in_window);
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/wpe/WebPageInspectorEmulationAgentWPE.cpp b/Source/WebKit/UIProcess/wpe/WebPageInspectorEmulationAgentWPE.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5dc76aa302cb574307059e66a1b73730efe920da
--- /dev/null
+++ b/Source/WebKit/UIProcess/wpe/WebPageInspectorEmulationAgentWPE.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebPageInspectorEmulationAgent.h"
+
+#include "WebPageProxy.h"
+#include <wpe/wpe.h>
+
+namespace WebKit {
+
+void WebPageInspectorEmulationAgent::platformSetSize(int width, int height, Function<void (const String& error)>&& callback)
+{
+    struct wpe_view_backend* backend = m_page.viewBackend();
+    wpe_view_backend_dispatch_set_size(backend, width, height);
+    callback(String());
+}
+
+} // namespace WebKit
diff --git a/Source/WebKit/UIProcess/wpe/WebPageInspectorInputAgentWPE.cpp b/Source/WebKit/UIProcess/wpe/WebPageInspectorInputAgentWPE.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c3d7cacea987ba2b094d5022c670705ef6ced129
--- /dev/null
+++ b/Source/WebKit/UIProcess/wpe/WebPageInspectorInputAgentWPE.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2019 Microsoft Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WebPageInspectorInputAgent.h"
+
+#include "NativeWebKeyboardEvent.h"
+#include "WebPageProxy.h"
+#include <WebCore/PlatformKeyboardEvent.h>
+#include <wpe/wpe.h>
+
+namespace WebKit {
+
+void WebPageInspectorInputAgent::platformDispatchKeyEvent(WebKeyboardEvent::Type type, const String& text, const String& unmodifiedText, const String& key, const String& code, const String& keyIdentifier, int windowsVirtualKeyCode, int nativeVirtualKeyCode, bool isAutoRepeat, bool isKeypad, bool isSystemKey, OptionSet<WebEvent::Modifier> modifiers, Vector<String>& macCommands, WallTime timestamp)
+{
+    NativeWebKeyboardEvent event(
+        type,
+        text,
+        unmodifiedText,
+        key,
+        code,
+        keyIdentifier,
+        windowsVirtualKeyCode,
+        nativeVirtualKeyCode,
+        isAutoRepeat,
+        isKeypad,
+        isSystemKey,
+        modifiers,
+        timestamp);
+    m_page.handleKeyboardEvent(event);
+}
+ 
+} // namespace WebKit
diff --git a/Source/WebKit/WebKit.xcodeproj/project.pbxproj b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
index 0dae1a0901e5892fc096aa9ab3881cf9e834b28a..e2cec4bdab646c96351b28939cfd58e74914226e 100644
--- a/Source/WebKit/WebKit.xcodeproj/project.pbxproj
+++ b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
@@ -1819,6 +1819,18 @@
 		CEE4AE2B1A5DCF430002F49B /* UIKitSPI.h in Headers */ = {isa = PBXBuildFile; fileRef = CEE4AE2A1A5DCF430002F49B /* UIKitSPI.h */; };
 		D3B9484711FF4B6500032B39 /* WebPopupMenu.h in Headers */ = {isa = PBXBuildFile; fileRef = D3B9484311FF4B6500032B39 /* WebPopupMenu.h */; };
 		D3B9484911FF4B6500032B39 /* WebSearchPopupMenu.h in Headers */ = {isa = PBXBuildFile; fileRef = D3B9484511FF4B6500032B39 /* WebSearchPopupMenu.h */; };
+		D71A94322370E025002C4D9E /* InspectorPlaywrightAgentClientMac.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A94302370E025002C4D9E /* InspectorPlaywrightAgentClientMac.h */; };
+		D71A94342370E07A002C4D9E /* InspectorPlaywrightAgentClient.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A94332370E07A002C4D9E /* InspectorPlaywrightAgentClient.h */; };
+		D71A943A2370F061002C4D9E /* RemoteInspectorPipe.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A94392370F060002C4D9E /* RemoteInspectorPipe.h */; };
+		D71A94422371F67E002C4D9E /* WebPageInspectorEmulationAgent.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A943F2371F67E002C4D9E /* WebPageInspectorEmulationAgent.h */; };
+		D71A94432371F67E002C4D9E /* WebPageInspectorInputAgent.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A94402371F67E002C4D9E /* WebPageInspectorInputAgent.h */; };
+		D71A944A2372290B002C4D9E /* _WKBrowserInspector.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A94492372290B002C4D9E /* _WKBrowserInspector.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		D71A944C237239FB002C4D9E /* BrowserInspectorPipe.h in Headers */ = {isa = PBXBuildFile; fileRef = D71A944B237239FB002C4D9E /* BrowserInspectorPipe.h */; };
+		D76D6888238DBD81008D314B /* InspectorDialogAgent.h in Headers */ = {isa = PBXBuildFile; fileRef = D76D6887238DBD80008D314B /* InspectorDialogAgent.h */; };
+		D79902B1236E9404005D6F7E /* WebPageInspectorEmulationAgentMac.mm in Sources */ = {isa = PBXBuildFile; fileRef = D79902AE236E9404005D6F7E /* WebPageInspectorEmulationAgentMac.mm */; };
+		D79902B2236E9404005D6F7E /* InspectorTargetProxyMac.mm in Sources */ = {isa = PBXBuildFile; fileRef = D79902AF236E9404005D6F7E /* InspectorTargetProxyMac.mm */; };
+		D79902B3236E9404005D6F7E /* WebPageInspectorInputAgentMac.mm in Sources */ = {isa = PBXBuildFile; fileRef = D79902B0236E9404005D6F7E /* WebPageInspectorInputAgentMac.mm */; };
+		D7EB04E72372A73B00F744CE /* InspectorPlaywrightAgentClientMac.mm in Sources */ = {isa = PBXBuildFile; fileRef = D7EB04E62372A73B00F744CE /* InspectorPlaywrightAgentClientMac.mm */; };
 		DF462E0F23F22F5500EFF35F /* WKHTTPCookieStorePrivate.h in Headers */ = {isa = PBXBuildFile; fileRef = DF462E0E23F22F5300EFF35F /* WKHTTPCookieStorePrivate.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		DF462E1223F338BE00EFF35F /* WKContentWorldPrivate.h in Headers */ = {isa = PBXBuildFile; fileRef = DF462E1123F338AD00EFF35F /* WKContentWorldPrivate.h */; settings = {ATTRIBUTES = (Private, ); }; };
 		DF84CEE4249AA24D009096F6 /* WKPDFHUDView.mm in Sources */ = {isa = PBXBuildFile; fileRef = DF84CEE2249AA21F009096F6 /* WKPDFHUDView.mm */; };
@@ -1878,6 +1890,9 @@
 		E5BEF6822130C48000F31111 /* WebDataListSuggestionsDropdownIOS.h in Headers */ = {isa = PBXBuildFile; fileRef = E5BEF6802130C47F00F31111 /* WebDataListSuggestionsDropdownIOS.h */; };
 		E5CB07DC20E1678F0022C183 /* WKFormColorControl.h in Headers */ = {isa = PBXBuildFile; fileRef = E5CB07DA20E1678F0022C183 /* WKFormColorControl.h */; };
 		ED82A7F2128C6FAF004477B3 /* WKBundlePageOverlay.h in Headers */ = {isa = PBXBuildFile; fileRef = 1A22F0FF1289FCD90085E74F /* WKBundlePageOverlay.h */; settings = {ATTRIBUTES = (Private, ); }; };
+		F303B849249A8D640031DE5C /* ScreencastEncoder.h in Headers */ = {isa = PBXBuildFile; fileRef = F303B848249A8D3A0031DE5C /* ScreencastEncoder.h */; };
+		F33C7AC7249AD79C0018BE41 /* libwebrtc.dylib in Frameworks */ = {isa = PBXBuildFile; fileRef = F33C7AC6249AD79C0018BE41 /* libwebrtc.dylib */; };
+		F3867F0A24607D4E008F0F31 /* InspectorScreencastAgent.h in Headers */ = {isa = PBXBuildFile; fileRef = F3867F0424607D2B008F0F31 /* InspectorScreencastAgent.h */; };
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 		F4094CBE25530540003D73E3 /* DisplayListWriterHandle.h in Headers */ = {isa = PBXBuildFile; fileRef = F4094CB92553047E003D73E3 /* DisplayListWriterHandle.h */; };
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@@ -5377,6 +5392,19 @@
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+		D71A942C2370DF81002C4D9E /* WKBrowserInspector.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WKBrowserInspector.h; sourceTree = "<group>"; };
+		D71A94302370E025002C4D9E /* InspectorPlaywrightAgentClientMac.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = InspectorPlaywrightAgentClientMac.h; sourceTree = "<group>"; };
+		D71A94332370E07A002C4D9E /* InspectorPlaywrightAgentClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = InspectorPlaywrightAgentClient.h; sourceTree = "<group>"; };
+		D71A94392370F060002C4D9E /* RemoteInspectorPipe.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RemoteInspectorPipe.h; sourceTree = "<group>"; };
+		D71A943F2371F67E002C4D9E /* WebPageInspectorEmulationAgent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebPageInspectorEmulationAgent.h; sourceTree = "<group>"; };
+		D71A94402371F67E002C4D9E /* WebPageInspectorInputAgent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebPageInspectorInputAgent.h; sourceTree = "<group>"; };
+		D71A94492372290B002C4D9E /* _WKBrowserInspector.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = _WKBrowserInspector.h; sourceTree = "<group>"; };
+		D71A944B237239FB002C4D9E /* BrowserInspectorPipe.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = BrowserInspectorPipe.h; sourceTree = "<group>"; };
+		D76D6887238DBD80008D314B /* InspectorDialogAgent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = InspectorDialogAgent.h; sourceTree = "<group>"; };
+		D79902AE236E9404005D6F7E /* WebPageInspectorEmulationAgentMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WebPageInspectorEmulationAgentMac.mm; sourceTree = "<group>"; };
+		D79902AF236E9404005D6F7E /* InspectorTargetProxyMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = InspectorTargetProxyMac.mm; sourceTree = "<group>"; };
+		D79902B0236E9404005D6F7E /* WebPageInspectorInputAgentMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WebPageInspectorInputAgentMac.mm; sourceTree = "<group>"; };
+		D7EB04E62372A73B00F744CE /* InspectorPlaywrightAgentClientMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = InspectorPlaywrightAgentClientMac.mm; sourceTree = "<group>"; };
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@@ -5493,6 +5521,14 @@
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+		F303B847249A8D3A0031DE5C /* ScreencastEncoder.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ScreencastEncoder.cpp; sourceTree = "<group>"; };
+		F303B848249A8D3A0031DE5C /* ScreencastEncoder.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ScreencastEncoder.h; sourceTree = "<group>"; };
+		F31E2DA424C76E4B004B2775 /* WebMFileWriter.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = WebMFileWriter.cpp; sourceTree = "<group>"; };
+		F31E2DA524C76E4C004B2775 /* WebMFileWriter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebMFileWriter.h; sourceTree = "<group>"; };
+		F33C7AC6249AD79C0018BE41 /* libwebrtc.dylib */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; path = libwebrtc.dylib; sourceTree = BUILT_PRODUCTS_DIR; };
+		F3867F0324607D2B008F0F31 /* InspectorScreencastAgent.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = InspectorScreencastAgent.cpp; sourceTree = "<group>"; };
+		F3867F0424607D2B008F0F31 /* InspectorScreencastAgent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = InspectorScreencastAgent.h; sourceTree = "<group>"; };
+		F3970344249BD4CE003E1A22 /* ScreencastEncoderMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ScreencastEncoderMac.mm; sourceTree = "<group>"; };
 		F4094CB92553047E003D73E3 /* DisplayListWriterHandle.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = DisplayListWriterHandle.h; sourceTree = "<group>"; };
 		F4094CBA2553047E003D73E3 /* DisplayListWriterHandle.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = DisplayListWriterHandle.cpp; sourceTree = "<group>"; };
 		F4094CBB255304AF003D73E3 /* DisplayListReaderHandle.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = DisplayListReaderHandle.h; sourceTree = "<group>"; };
@@ -5597,6 +5633,7 @@
 				3766F9EF189A1244003CF19B /* QuartzCore.framework in Frameworks */,
 				37694525184FC6B600CDE21F /* Security.framework in Frameworks */,
 				37BEC4DD1948FC6A008B4286 /* WebCore.framework in Frameworks */,
+				F33C7AC7249AD79C0018BE41 /* libwebrtc.dylib in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -7345,6 +7382,7 @@
 		37C4C08318149C2A003688B9 /* Cocoa */ = {
 			isa = PBXGroup;
 			children = (
+				D71A94492372290B002C4D9E /* _WKBrowserInspector.h */,
 				1A43E826188F38E2009E4D30 /* Deprecated */,
 				37A5E01218BBF937000A081E /* _WKActivatedElementInfo.h */,
 				37A5E01118BBF937000A081E /* _WKActivatedElementInfo.mm */,
@@ -8331,6 +8369,7 @@
 			isa = PBXGroup;
 			children = (
 				57A9FF15252C6AEF006A2040 /* libWTF.a */,
+				F33C7AC6249AD79C0018BE41 /* libwebrtc.dylib */,
 				5750F32A2032D4E500389347 /* LocalAuthentication.framework */,
 				570DAAB0230273D200E8FC04 /* NearField.framework */,
 			);
@@ -8740,6 +8779,12 @@
 			children = (
 				9197940423DBC4BB00257892 /* InspectorBrowserAgent.cpp */,
 				9197940323DBC4BB00257892 /* InspectorBrowserAgent.h */,
+				F3867F0324607D2B008F0F31 /* InspectorScreencastAgent.cpp */,
+				F3867F0424607D2B008F0F31 /* InspectorScreencastAgent.h */,
+				F303B847249A8D3A0031DE5C /* ScreencastEncoder.cpp */,
+				F303B848249A8D3A0031DE5C /* ScreencastEncoder.h */,
+				F31E2DA424C76E4B004B2775 /* WebMFileWriter.cpp */,
+				F31E2DA524C76E4C004B2775 /* WebMFileWriter.h */,
 			);
 			path = Agents;
 			sourceTree = "<group>";
@@ -8748,6 +8793,7 @@
 			isa = PBXGroup;
 			children = (
 				A5D3504D1D78F0D2005124A9 /* RemoteWebInspectorProxyMac.mm */,
+				F3970344249BD4CE003E1A22 /* ScreencastEncoderMac.mm */,
 				1CA8B935127C774E00576C2B /* WebInspectorProxyMac.mm */,
 				994BADF11F7D77EA00B571E7 /* WKInspectorViewController.h */,
 				994BADF21F7D77EB00B571E7 /* WKInspectorViewController.mm */,
@@ -9185,6 +9231,12 @@
 		BC032DC310F438260058C15A /* UIProcess */ = {
 			isa = PBXGroup;
 			children = (
+				D76D6887238DBD80008D314B /* InspectorDialogAgent.h */,
+				D71A944B237239FB002C4D9E /* BrowserInspectorPipe.h */,
+				D71A943F2371F67E002C4D9E /* WebPageInspectorEmulationAgent.h */,
+				D71A94402371F67E002C4D9E /* WebPageInspectorInputAgent.h */,
+				D71A94392370F060002C4D9E /* RemoteInspectorPipe.h */,
+				D71A94332370E07A002C4D9E /* InspectorPlaywrightAgentClient.h */,
 				BC032DC410F4387C0058C15A /* API */,
 				512F588D12A8836F00629530 /* Authentication */,
 				9955A6E81C79809000EB6A93 /* Automation */,
@@ -9470,6 +9522,7 @@
 		BC0C376610F807660076D7CB /* C */ = {
 			isa = PBXGroup;
 			children = (
+				D71A942C2370DF81002C4D9E /* WKBrowserInspector.h */,
 				5123CF18133D25E60056F800 /* cg */,
 				6EE849C41368D9040038D481 /* mac */,
 				BCB63477116BF10600603215 /* WebKit2_C.h */,
@@ -10065,6 +10118,11 @@
 		BCCF085C113F3B7500C650C5 /* mac */ = {
 			isa = PBXGroup;
 			children = (
+				D7EB04E62372A73B00F744CE /* InspectorPlaywrightAgentClientMac.mm */,
+				D71A94302370E025002C4D9E /* InspectorPlaywrightAgentClientMac.h */,
+				D79902AE236E9404005D6F7E /* WebPageInspectorEmulationAgentMac.mm */,
+				D79902B0236E9404005D6F7E /* WebPageInspectorInputAgentMac.mm */,
+				D79902AF236E9404005D6F7E /* InspectorTargetProxyMac.mm */,
 				B878B613133428DC006888E9 /* CorrectionPanel.h */,
 				B878B614133428DC006888E9 /* CorrectionPanel.mm */,
 				C1817362205844A900DFDA65 /* DisplayLink.cpp */,
@@ -10830,6 +10888,7 @@
 				99788ACB1F421DDA00C08000 /* _WKAutomationSessionConfiguration.h in Headers */,
 				990D28AC1C6420CF00986977 /* _WKAutomationSessionDelegate.h in Headers */,
 				990D28B11C65208D00986977 /* _WKAutomationSessionInternal.h in Headers */,
+				D71A944A2372290B002C4D9E /* _WKBrowserInspector.h in Headers */,
 				5C4609E7224317B4009943C2 /* _WKContentRuleListAction.h in Headers */,
 				5C4609E8224317BB009943C2 /* _WKContentRuleListActionInternal.h in Headers */,
 				1A5704F81BE01FF400874AF1 /* _WKContextMenuElementInfo.h in Headers */,
@@ -11112,6 +11171,7 @@
 				1A14F8E21D74C834006CBEC6 /* FrameInfoData.h in Headers */,
 				1AE00D611831792100087DD7 /* FrameLoadState.h in Headers */,
 				5C121E842410208D00486F9B /* FrameTreeNodeData.h in Headers */,
+				F303B849249A8D640031DE5C /* ScreencastEncoder.h in Headers */,
 				2D4AF0892044C3C4006C8817 /* FrontBoardServicesSPI.h in Headers */,
 				CD78E1151DB7D7ED0014A2DE /* FullscreenClient.h in Headers */,
 				CD19D2EA2046406F0017074A /* FullscreenTouchSecheuristic.h in Headers */,
@@ -11124,6 +11184,7 @@
 				BC06F43A12DBCCFB002D78DE /* GeolocationPermissionRequestProxy.h in Headers */,
 				2DA944A41884E4F000ED86DB /* GestureTypes.h in Headers */,
 				2DA049B8180CCD0A00AAFA9E /* GraphicsLayerCARemote.h in Headers */,
+				D71A94342370E07A002C4D9E /* InspectorPlaywrightAgentClient.h in Headers */,
 				C0CE72AD1247E78D00BC0EC4 /* HandleMessage.h in Headers */,
 				1AC75A1B1B3368270056745B /* HangDetectionDisabler.h in Headers */,
 				57AC8F50217FEED90055438C /* HidConnection.h in Headers */,
@@ -11255,8 +11316,10 @@
 				413075AC1DE85F370039EC69 /* NetworkRTCMonitor.h in Headers */,
 				41DC45961E3D6E2200B11F51 /* NetworkRTCProvider.h in Headers */,
 				5C20CBA01BB1ECD800895BB1 /* NetworkSession.h in Headers */,
+				D71A94422371F67E002C4D9E /* WebPageInspectorEmulationAgent.h in Headers */,
 				532159551DBAE7290054AA3C /* NetworkSessionCocoa.h in Headers */,
 				417915B92257046F00D6F97E /* NetworkSocketChannel.h in Headers */,
+				D71A943A2370F061002C4D9E /* RemoteInspectorPipe.h in Headers */,
 				570DAAC22303730300E8FC04 /* NfcConnection.h in Headers */,
 				570DAAAE23026F5C00E8FC04 /* NfcService.h in Headers */,
 				31A2EC5614899C0900810D71 /* NotificationPermissionRequest.h in Headers */,
@@ -11339,6 +11402,7 @@
 				BC1A7C581136E19C00FB7167 /* ProcessLauncher.h in Headers */,
 				463FD4821EB94EC000A2982C /* ProcessTerminationReason.h in Headers */,
 				86E67A251910B9D100004AB7 /* ProcessThrottler.h in Headers */,
+				D71A944C237239FB002C4D9E /* BrowserInspectorPipe.h in Headers */,
 				83048AE61ACA45DC0082C832 /* ProcessThrottlerClient.h in Headers */,
 				A1E688701F6E2BAB007006A6 /* QuarantineSPI.h in Headers */,
 				1A0C227E2451130A00ED614D /* QuickLookThumbnailingSoftLink.h in Headers */,
@@ -11648,6 +11712,7 @@
 				A543E30D215C8A9000279CD9 /* WebPageInspectorTargetController.h in Headers */,
 				A543E307215AD13700279CD9 /* WebPageInspectorTargetFrontendChannel.h in Headers */,
 				C0CE72A11247E71D00BC0EC4 /* WebPageMessages.h in Headers */,
+				F3867F0A24607D4E008F0F31 /* InspectorScreencastAgent.h in Headers */,
 				2D5C9D0619C81D8F00B3C5C1 /* WebPageOverlay.h in Headers */,
 				46C392292316EC4D008EED9B /* WebPageProxyIdentifier.h in Headers */,
 				BCBD3915125BB1A800D2C29F /* WebPageProxyMessages.h in Headers */,
@@ -11778,6 +11843,7 @@
 				BCD25F1711D6BDE100169B0E /* WKBundleFrame.h in Headers */,
 				BCF049E611FE20F600F86A58 /* WKBundleFramePrivate.h in Headers */,
 				BC49862F124D18C100D834E1 /* WKBundleHitTestResult.h in Headers */,
+				D71A94432371F67E002C4D9E /* WebPageInspectorInputAgent.h in Headers */,
 				BC204EF211C83EC8008F3375 /* WKBundleInitialize.h in Headers */,
 				65B86F1E12F11DE300B7DD8A /* WKBundleInspector.h in Headers */,
 				1A8B66B41BC45B010082DF77 /* WKBundleMac.h in Headers */,
@@ -11831,6 +11897,7 @@
 				5C795D71229F3757003FF1C4 /* WKContextMenuElementInfoPrivate.h in Headers */,
 				51A555F6128C6C47009ABCEC /* WKContextMenuItem.h in Headers */,
 				51A55601128C6D92009ABCEC /* WKContextMenuItemTypes.h in Headers */,
+				D76D6888238DBD81008D314B /* InspectorDialogAgent.h in Headers */,
 				A1EA02381DABFF7E0096021F /* WKContextMenuListener.h in Headers */,
 				BCC938E11180DE440085E5FE /* WKContextPrivate.h in Headers */,
 				9FB5F395169E6A80002C25BF /* WKContextPrivateMac.h in Headers */,
@@ -11980,6 +12047,7 @@
 				1AB8A1F818400BB800E9AE69 /* WKPageContextMenuClient.h in Headers */,
 				8372DB251A674C8F00C697C5 /* WKPageDiagnosticLoggingClient.h in Headers */,
 				1AB8A1F418400B8F00E9AE69 /* WKPageFindClient.h in Headers */,
+				D71A94322370E025002C4D9E /* InspectorPlaywrightAgentClientMac.h in Headers */,
 				1AB8A1F618400B9D00E9AE69 /* WKPageFindMatchesClient.h in Headers */,
 				1AB8A1F018400B0000E9AE69 /* WKPageFormClient.h in Headers */,
 				BC7B633712A45ABA00D174A4 /* WKPageGroup.h in Headers */,
@@ -13115,6 +13183,7 @@
 				C1A152D724E5A29A00978C8B /* HandleXPCEndpointMessages.mm in Sources */,
 				2749F6442146561B008380BF /* InjectedBundleNodeHandle.cpp in Sources */,
 				2749F6452146561E008380BF /* InjectedBundleRangeHandle.cpp in Sources */,
+				D79902B2236E9404005D6F7E /* InspectorTargetProxyMac.mm in Sources */,
 				9BF5EC642541145600984E77 /* JSIPCBinding.cpp in Sources */,
 				2D913441212CF9F000128AFD /* JSNPMethod.cpp in Sources */,
 				2D913442212CF9F000128AFD /* JSNPObject.cpp in Sources */,
@@ -13130,6 +13199,7 @@
 				2D92A781212B6A7100F493FD /* MessageReceiverMap.cpp in Sources */,
 				2D92A782212B6A7100F493FD /* MessageSender.cpp in Sources */,
 				2D92A77A212B6A6100F493FD /* Module.cpp in Sources */,
+				D79902B1236E9404005D6F7E /* WebPageInspectorEmulationAgentMac.mm in Sources */,
 				57B826452304F14000B72EB0 /* NearFieldSoftLink.mm in Sources */,
 				2D913443212CF9F000128AFD /* NetscapeBrowserFuncs.cpp in Sources */,
 				2D913444212CF9F000128AFD /* NetscapePlugin.cpp in Sources */,
@@ -13153,6 +13223,7 @@
 				1A2D8439127F65D5001EB962 /* NPObjectMessageReceiverMessageReceiver.cpp in Sources */,
 				2D92A792212B6AD400F493FD /* NPObjectProxy.cpp in Sources */,
 				2D92A793212B6AD400F493FD /* NPRemoteObjectMap.cpp in Sources */,
+				D7EB04E72372A73B00F744CE /* InspectorPlaywrightAgentClientMac.mm in Sources */,
 				2D913447212CF9F000128AFD /* NPRuntimeObjectMap.cpp in Sources */,
 				2D913448212CF9F000128AFD /* NPRuntimeUtilities.cpp in Sources */,
 				2D92A794212B6AD400F493FD /* NPVariantData.cpp in Sources */,
@@ -13442,6 +13513,7 @@
 				2D92A78C212B6AB100F493FD /* WebMouseEvent.cpp in Sources */,
 				31BA924D148831260062EDB5 /* WebNotificationManagerMessageReceiver.cpp in Sources */,
 				2DF6FE52212E110900469030 /* WebPage.cpp in Sources */,
+				D79902B3236E9404005D6F7E /* WebPageInspectorInputAgentMac.mm in Sources */,
 				C0CE72A01247E71D00BC0EC4 /* WebPageMessageReceiver.cpp in Sources */,
 				BCBD3914125BB1A800D2C29F /* WebPageProxyMessageReceiver.cpp in Sources */,
 				7CE9CE101FA0767A000177DE /* WebPageUpdatePreferences.cpp in Sources */,
diff --git a/Source/WebKit/WebProcess/Network/WebLoaderStrategy.cpp b/Source/WebKit/WebProcess/Network/WebLoaderStrategy.cpp
index 69dea7493e2683c5417ebc9fa647b687ea710b83..427c4ddd5c3b6743ff686790e9076700e3705c3a 100644
--- a/Source/WebKit/WebProcess/Network/WebLoaderStrategy.cpp
+++ b/Source/WebKit/WebProcess/Network/WebLoaderStrategy.cpp
@@ -223,6 +223,11 @@ void WebLoaderStrategy::scheduleLoad(ResourceLoader& resourceLoader, CachedResou
     }
 #endif
 
+    if (m_emulateOfflineState) {
+        scheduleInternallyFailedLoad(resourceLoader);
+        return;
+    }
+
     if (!tryLoadingUsingURLSchemeHandler(resourceLoader, trackingParameters)) {
         WEBLOADERSTRATEGY_RELEASE_LOG_IF_ALLOWED("scheduleLoad: URL will be scheduled with the NetworkProcess");
 
@@ -770,7 +775,7 @@ void WebLoaderStrategy::didFinishPreconnection(uint64_t preconnectionIdentifier,
 
 bool WebLoaderStrategy::isOnLine() const
 {
-    return m_isOnLine;
+    return m_emulateOfflineState ? false : m_isOnLine;
 }
 
 void WebLoaderStrategy::addOnlineStateChangeListener(Function<void(bool)>&& listener)
@@ -790,6 +795,11 @@ void WebLoaderStrategy::isResourceLoadFinished(CachedResource& resource, Complet
 
 void WebLoaderStrategy::setOnLineState(bool isOnLine)
 {
+    if (m_emulateOfflineState) {
+        m_isOnLine = isOnLine;
+        return;
+    }
+
     if (m_isOnLine == isOnLine)
         return;
 
@@ -798,6 +808,12 @@ void WebLoaderStrategy::setOnLineState(bool isOnLine)
         listener(isOnLine);
 }
 
+void WebLoaderStrategy::setEmulateOfflineState(bool offline) {
+    m_emulateOfflineState = offline;
+    for (auto& listener : m_onlineStateChangeListeners)
+        listener(offline ? false : m_isOnLine);
+}
+
 void WebLoaderStrategy::setCaptureExtraNetworkLoadMetricsEnabled(bool enabled)
 {
     WebProcess::singleton().ensureNetworkProcessConnection().connection().send(Messages::NetworkConnectionToWebProcess::SetCaptureExtraNetworkLoadMetricsEnabled(enabled), 0);
diff --git a/Source/WebKit/WebProcess/Network/WebLoaderStrategy.h b/Source/WebKit/WebProcess/Network/WebLoaderStrategy.h
index 9d9884183ec93daeb3ab63218960172a050e0ffb..65ae20cbeaf74d4954590b76ae63a4b2a9c1b506 100644
--- a/Source/WebKit/WebProcess/Network/WebLoaderStrategy.h
+++ b/Source/WebKit/WebProcess/Network/WebLoaderStrategy.h
@@ -88,6 +88,7 @@ public:
     bool isOnLine() const final;
     void addOnlineStateChangeListener(Function<void(bool)>&&) final;
     void setOnLineState(bool);
+    void setEmulateOfflineState(bool) final;
 
     static uint64_t generateLoadIdentifier();
 
@@ -130,6 +131,7 @@ private:
     HashMap<unsigned long, PreconnectCompletionHandler> m_preconnectCompletionHandlers;
     Vector<Function<void(bool)>> m_onlineStateChangeListeners;
     bool m_isOnLine { true };
+    bool m_emulateOfflineState { false };
 };
 
 } // namespace WebKit
diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebChromeClient.cpp b/Source/WebKit/WebProcess/WebCoreSupport/WebChromeClient.cpp
index 659f6fea321cad27ac9854a6f22b7d7e976c5351..50ebbd5d8cea05e5e67e8b84015c3a140ee9a13e 100644
--- a/Source/WebKit/WebProcess/WebCoreSupport/WebChromeClient.cpp
+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebChromeClient.cpp
@@ -390,6 +390,8 @@ void WebChromeClient::setResizable(bool resizable)
 
 void WebChromeClient::addMessageToConsole(MessageSource source, MessageLevel level, const String& message, unsigned lineNumber, unsigned columnNumber, const String& sourceID)
 {
+    if (level == MessageLevel::Error)
+        m_page.send(Messages::WebPageProxy::LogToStderr(message));
     // Notify the bundle client.
     m_page.injectedBundleUIClient().willAddMessageToConsole(&m_page, source, level, message, lineNumber, columnNumber, sourceID);
 }
@@ -809,6 +811,13 @@ std::unique_ptr<DateTimeChooser> WebChromeClient::createDateTimeChooser(DateTime
 
 #endif
 
+#if ENABLE(ORIENTATION_EVENTS) && !PLATFORM(IOS_FAMILY)
+int WebChromeClient::deviceOrientation() const {
+    // Only overrides are supported for non-iOS platforms.
+    return 0;
+}
+#endif
+
 void WebChromeClient::runOpenPanel(Frame& frame, FileChooser& fileChooser)
 {
     if (m_page.activeOpenPanelResultListener())
diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp b/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
index 603adf8b2e94936af0746dee9617a4f255421e06..35fe77ffd5b59cf35e499c6bce90b7c2c00744a1 100644
--- a/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp
@@ -1558,13 +1558,6 @@ void WebFrameLoaderClient::transitionToCommittedForNewPage()
     if (webPage->scrollPinningBehavior() != DoNotPin)
         view->setScrollPinningBehavior(webPage->scrollPinningBehavior());
 
-#if USE(COORDINATED_GRAPHICS)
-    if (shouldUseFixedLayout) {
-        view->setDelegatesScrolling(shouldUseFixedLayout);
-        view->setPaintsEntireContents(shouldUseFixedLayout);
-        return;
-    }
-#endif
 }
 
 void WebFrameLoaderClient::didRestoreFromBackForwardCache()
diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/DrawingAreaCoordinatedGraphics.cpp b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/DrawingAreaCoordinatedGraphics.cpp
index 4f1a1ff1e4476cd8b272eb14100015943296eb19..c77cce25000a35040996ff36e2fca207d59cb6b7 100644
--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/DrawingAreaCoordinatedGraphics.cpp
+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/DrawingAreaCoordinatedGraphics.cpp
@@ -36,7 +36,9 @@
 #include "WebPageCreationParameters.h"
 #include "WebPreferencesKeys.h"
 #include <WebCore/Frame.h>
+#include <WebCore/FrameView.h>
 #include <WebCore/GraphicsContext.h>
+#include <WebCore/InspectorController.h>
 #include <WebCore/Page.h>
 #include <WebCore/PageOverlayController.h>
 #include <WebCore/Settings.h>
@@ -122,6 +124,16 @@ void DrawingAreaCoordinatedGraphics::scroll(const IntRect& scrollRect, const Int
         ASSERT(m_scrollRect.isEmpty());
         ASSERT(m_scrollOffset.isEmpty());
         ASSERT(m_dirtyRegion.isEmpty());
+// Playwright begin
+#if !PLATFORM(WIN)
+        if (m_webPage.mainFrameView() && m_webPage.mainFrameView()->useFixedLayout()) {
+            IntRect visibleRect;
+            visibleRect.move(-scrollDelta.width(), -scrollDelta.height());
+            m_layerTreeHost->scrollNonCompositedContents(visibleRect);
+            return;
+        }
+#endif
+// Playwright end
         m_layerTreeHost->scrollNonCompositedContents(scrollRect);
         return;
     }
@@ -247,6 +259,7 @@ void DrawingAreaCoordinatedGraphics::updatePreferences(const WebPreferencesStore
         settings.setAcceleratedCompositingEnabled(false);
     }
 #endif
+
     settings.setForceCompositingMode(store.getBoolValueForKey(WebPreferencesKey::forceCompositingModeKey()));
     // Fixed position elements need to be composited and create stacking contexts
     // in order to be scrolled by the ScrollingCoordinator.
@@ -616,6 +629,11 @@ void DrawingAreaCoordinatedGraphics::enterAcceleratedCompositingMode(GraphicsLay
     m_scrollOffset = IntSize();
     m_displayTimer.stop();
     m_isWaitingForDidUpdate = false;
+// Playwright begin
+#if PLATFORM(WIN)
+    didChangeAcceleratedCompositingMode(true);
+#endif
+// Playwright end
 }
 
 void DrawingAreaCoordinatedGraphics::exitAcceleratedCompositingMode()
@@ -665,6 +683,11 @@ void DrawingAreaCoordinatedGraphics::exitAcceleratedCompositingMode()
         // UI process, we still need to let it know about the new contents, so send an Update message.
         send(Messages::DrawingAreaProxy::Update(m_backingStoreStateID, updateInfo));
     }
+// Playwright begin
+#if PLATFORM(WIN)
+    didChangeAcceleratedCompositingMode(false);
+#endif
+// Playwright end
 }
 
 void DrawingAreaCoordinatedGraphics::scheduleDisplay()
diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHost.cpp b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHost.cpp
index 8685e23d0d468601c459954775fe6f565b0ce7ac..f9d49292837bf390b81eadeaebe2d4d599bc236c 100644
--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHost.cpp
+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHost.cpp
@@ -166,8 +166,16 @@ void LayerTreeHost::setViewOverlayRootLayer(GraphicsLayer* viewOverlayRootLayer)
 void LayerTreeHost::scrollNonCompositedContents(const IntRect& rect)
 {
     auto* frameView = m_webPage.mainFrameView();
+
+// Playwright begin
+#if PLATFORM(WIN)
     if (!frameView || !frameView->delegatesScrolling())
+        return
+#else
+    if (!frameView)
         return;
+#endif
+// Playwright end
 
     m_viewportController.didScroll(rect.location());
     if (m_isDiscardable)
diff --git a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHostTextureMapper.cpp b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHostTextureMapper.cpp
index 28e2c6d10fa08265d8edb7449565ee527f9826ed..044e7a5a9f3fb74fbfb7cdae33df4439d1b2938a 100644
--- a/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHostTextureMapper.cpp
+++ b/Source/WebKit/WebProcess/WebPage/CoordinatedGraphics/LayerTreeHostTextureMapper.cpp
@@ -29,6 +29,7 @@
 
 #if USE(GRAPHICS_LAYER_TEXTURE_MAPPER)
 
+#include "DrawingArea.h"
 #include "WebPage.h"
 #include <GLES2/gl2.h>
 #include <WebCore/Document.h>
diff --git a/Source/WebKit/WebProcess/WebPage/DrawingArea.cpp b/Source/WebKit/WebProcess/WebPage/DrawingArea.cpp
index 97429e9769d2accf3d99949e2f6ca8a4e8acece9..eda4008b60b4f28958e246ae9aea773b4407769e 100644
--- a/Source/WebKit/WebProcess/WebPage/DrawingArea.cpp
+++ b/Source/WebKit/WebProcess/WebPage/DrawingArea.cpp
@@ -27,6 +27,7 @@
 #include "DrawingArea.h"
 
 #include "DrawingAreaMessages.h"
+#include "DrawingAreaProxyMessages.h"
 #include "WebPage.h"
 #include "WebPageCreationParameters.h"
 #include "WebProcess.h"
@@ -89,6 +90,13 @@ RefPtr<WebCore::DisplayRefreshMonitor> DrawingArea::createDisplayRefreshMonitor(
 }
 #endif
 
+#if PLATFORM(WIN)
+void DrawingArea::didChangeAcceleratedCompositingMode(bool enabled)
+{
+    send(Messages::DrawingAreaProxy::DidChangeAcceleratedCompositingMode(enabled));
+}
+#endif
+
 void DrawingArea::removeMessageReceiverIfNeeded()
 {
     if (m_hasRemovedMessageReceiver)
diff --git a/Source/WebKit/WebProcess/WebPage/DrawingArea.h b/Source/WebKit/WebProcess/WebPage/DrawingArea.h
index e1c230af001c04e9ad5c525a31b5c912e2eac3bd..9c1a2473fe463830718412f62506a14ceff63e10 100644
--- a/Source/WebKit/WebProcess/WebPage/DrawingArea.h
+++ b/Source/WebKit/WebProcess/WebPage/DrawingArea.h
@@ -143,6 +143,9 @@ public:
     virtual void didChangeViewportAttributes(WebCore::ViewportAttributes&&) = 0;
     virtual void deviceOrPageScaleFactorChanged() = 0;
 #endif
+#if PLATFORM(WIN)
+    void didChangeAcceleratedCompositingMode(bool enabled);
+#endif
 
     virtual void adoptLayersFromDrawingArea(DrawingArea&) { }
     virtual void adoptDisplayRefreshMonitorsFromDrawingArea(DrawingArea&) { }
diff --git a/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.cpp b/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.cpp
index b2d54a627b94583bda3518c4e7c3364481b605a4..d407e32b6a7b8b27925c49391e86d42c9b3dfa8b 100644
--- a/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.cpp
+++ b/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.cpp
@@ -47,6 +47,14 @@ void WebDocumentLoader::detachFromFrame()
     DocumentLoader::detachFromFrame();
 }
 
+void WebDocumentLoader::replacedByFragmentNavigation(Frame& frame)
+{
+    ASSERT(!this->frame());
+    // Notify WebPageProxy that the navigation has been converted into same page navigation.
+    if (m_navigationID)
+        WebFrame::fromCoreFrame(frame)->documentLoaderDetached(m_navigationID);
+}
+
 void WebDocumentLoader::setNavigationID(uint64_t navigationID)
 {
     ASSERT(navigationID);
diff --git a/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.h b/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.h
index f127d64d005ab7b93875591b94a5899205e91579..df0de26e4dc449a0fbf93e7037444df4e5365822 100644
--- a/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.h
+++ b/Source/WebKit/WebProcess/WebPage/WebDocumentLoader.h
@@ -43,7 +43,10 @@ public:
 private:
     WebDocumentLoader(const WebCore::ResourceRequest&, const WebCore::SubstituteData&);
 
+    uint64_t loaderIDForInspector() override { return navigationID(); }
+
     void detachFromFrame() override;
+    void replacedByFragmentNavigation(WebCore::Frame&) override;
 
     uint64_t m_navigationID;
 };
diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.cpp b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
index 19a20b76a6be17654b5781d13b68a095bcccbe00..aea6a7702647082e248bf012d162c39d1f719fbd 100644
--- a/Source/WebKit/WebProcess/WebPage/WebPage.cpp
+++ b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
@@ -821,6 +821,9 @@ WebPage::WebPage(PageIdentifier pageID, WebPageCreationParameters&& parameters)
 
     m_page->setCanUseCredentialStorage(parameters.canUseCredentialStorage);
 
+    if (parameters.shouldPauseInInspectorWhenShown)
+        m_page->inspectorController().pauseWhenShown();
+
     updateThrottleState();
 }
 
@@ -1609,6 +1612,22 @@ void WebPage::platformDidReceiveLoadParameters(const LoadParameters& loadParamet
 }
 #endif
 
+void WebPage::loadRequestInFrameForInspector(LoadParameters&& loadParameters, WebCore::FrameIdentifier frameID)
+{
+    WebFrame* frame = WebProcess::singleton().webFrame(frameID);
+    if (!frame) {
+        send(Messages::WebPageProxy::DidDestroyNavigation(loadParameters.navigationID));
+        return;
+    }
+
+    // FIXME: use m_pendingNavigationID instead?
+    m_pendingFrameNavigationID = loadParameters.navigationID;
+
+    FrameLoadRequest frameLoadRequest { *frame->coreFrame(), loadParameters.request };
+    frame->coreFrame()->loader().load(WTFMove(frameLoadRequest));
+    ASSERT(!m_pendingFrameNavigationID);
+}
+
 void WebPage::loadRequest(LoadParameters&& loadParameters)
 {
 #if ENABLE(APP_BOUND_DOMAINS)
@@ -1828,17 +1847,13 @@ void WebPage::setSize(const WebCore::IntSize& viewSize)
     view->resize(viewSize);
     m_drawingArea->setNeedsDisplay();
 
-#if USE(COORDINATED_GRAPHICS)
     if (view->useFixedLayout())
         sendViewportAttributesChanged(m_page->viewportArguments());
-#endif
 }
 
-#if USE(COORDINATED_GRAPHICS)
 void WebPage::sendViewportAttributesChanged(const ViewportArguments& viewportArguments)
 {
-    FrameView* view = m_page->mainFrame().view();
-    ASSERT(view && view->useFixedLayout());
+    ASSERT(m_page->mainFrame().view() && m_page->mainFrame().view()->useFixedLayout());
 
     // Viewport properties have no impact on zero sized fixed viewports.
     if (m_viewSize.isEmpty())
@@ -1855,20 +1870,18 @@ void WebPage::sendViewportAttributesChanged(const ViewportArguments& viewportArg
 
     ViewportAttributes attr = computeViewportAttributes(viewportArguments, minimumLayoutFallbackWidth, deviceWidth, deviceHeight, 1, m_viewSize);
 
-    // If no layout was done yet set contentFixedOrigin to (0,0).
-    IntPoint contentFixedOrigin = view->didFirstLayout() ? view->fixedVisibleContentRect().location() : IntPoint();
-
-    // Put the width and height to the viewport width and height. In css units however.
-    // Use FloatSize to avoid truncated values during scale.
-    FloatSize contentFixedSize = m_viewSize;
-
-    contentFixedSize.scale(1 / attr.initialScale);
-    view->setFixedVisibleContentRect(IntRect(contentFixedOrigin, roundedIntSize(contentFixedSize)));
+#if ENABLE(CSS_DEVICE_ADAPTATION)
+    FrameView* view = m_page->mainFrame().view();
+    // CSS viewport descriptors might be applied to already affected viewport size
+    // if the page enables/disables stylesheets, so need to keep initial viewport size.
+    view->setInitialViewportSize(roundedIntSize(m_viewSize));
+#endif
 
     attr.initialScale = m_page->viewportArguments().zoom; // Resets auto (-1) if no value was set by user.
 
     // This also takes care of the relayout.
     setFixedLayoutSize(roundedIntSize(attr.layoutSize));
+    scaleView(deviceWidth / attr.layoutSize.width());
 
 #if USE(COORDINATED_GRAPHICS)
     m_drawingArea->didChangeViewportAttributes(WTFMove(attr));
@@ -1876,7 +1889,6 @@ void WebPage::sendViewportAttributesChanged(const ViewportArguments& viewportArg
     send(Messages::WebPageProxy::DidChangeViewportProperties(attr));
 #endif
 }
-#endif
 
 void WebPage::scrollMainFrameIfNotAtMaxScrollPosition(const IntSize& scrollOffset)
 {
@@ -2175,6 +2187,7 @@ void WebPage::scaleView(double scale)
     }
 
     m_page->setViewScaleFactor(scale);
+    send(Messages::WebPageProxy::ViewScaleFactorDidChange(scale));
     scalePage(pageScale, scrollPositionAtNewScale);
 }
 
@@ -2279,17 +2292,13 @@ void WebPage::viewportPropertiesDidChange(const ViewportArguments& viewportArgum
         viewportConfigurationChanged();
 #endif
 
-#if USE(COORDINATED_GRAPHICS)
     FrameView* view = m_page->mainFrame().view();
     if (view && view->useFixedLayout())
         sendViewportAttributesChanged(viewportArguments);
+#if USE(COORDINATED_GRAPHICS)
     else
         m_drawingArea->didChangeViewportAttributes(ViewportAttributes());
 #endif
-
-#if !PLATFORM(IOS_FAMILY) && !USE(COORDINATED_GRAPHICS)
-    UNUSED_PARAM(viewportArguments);
-#endif
 }
 
 void WebPage::listenForLayoutMilestones(OptionSet<WebCore::LayoutMilestone> milestones)
@@ -3117,6 +3126,104 @@ void WebPage::touchEvent(const WebTouchEvent& touchEvent)
 
     send(Messages::WebPageProxy::DidReceiveEvent(static_cast<uint32_t>(touchEvent.type()), handled));
 }
+
+void WebPage::fakeTouchTap(const WebCore::IntPoint& position, uint8_t modifiers, CompletionHandler<void()>&& completionHandler)
+{
+    SetForScope<bool> userIsInteractingChange { m_userIsInteracting, true };
+
+    bool handled = false;
+
+    uint32_t id = 0;
+    float radiusX = 1.0;
+    float radiusY = 1.0;
+    float rotationAngle = 0.0;
+    float force = 1.0;
+    const WebCore::IntSize radius(radiusX,radiusY);
+    const WebCore::IntPoint screenPosition = position;
+    OptionSet<WebEvent::Modifier> eventModifiers;
+    eventModifiers = eventModifiers.fromRaw(modifiers);
+
+    {
+        Vector<WebPlatformTouchPoint> touchPoints;
+        WebPlatformTouchPoint::TouchPointState state = WebPlatformTouchPoint::TouchPointState::TouchPressed;
+        touchPoints.append(WebPlatformTouchPoint(id, state, screenPosition, position, radius, rotationAngle, force));
+
+        WebTouchEvent touchEvent(WebEvent::TouchStart, WTFMove(touchPoints), eventModifiers, WallTime::now());
+
+        CurrentEvent currentEvent(touchEvent);
+        handled = handleTouchEvent(touchEvent, m_page.get());
+    }
+    {
+        Vector<WebPlatformTouchPoint> touchPoints;
+        WebPlatformTouchPoint::TouchPointState state = WebPlatformTouchPoint::TouchPointState::TouchReleased;
+        touchPoints.append(WebPlatformTouchPoint(id, state, screenPosition, position, radius, rotationAngle, force));
+
+        WebTouchEvent touchEvent(WebEvent::TouchEnd, WTFMove(touchPoints), eventModifiers, WallTime::now());
+
+        CurrentEvent currentEvent(touchEvent);
+        handled = handleTouchEvent(touchEvent, m_page.get()) || handled;
+    }
+    if (!handled) {
+        FloatPoint adjustedPoint;
+        Node* nodeRespondingToClick = m_page->mainFrame().nodeRespondingToClickEvents(position, adjustedPoint);
+        Frame* frameRespondingToClick = nodeRespondingToClick ? nodeRespondingToClick->document().frame() : nullptr;
+        IntPoint adjustedIntPoint = roundedIntPoint(adjustedPoint);
+        if (!frameRespondingToClick) {
+            completionHandler();
+            return;
+        }
+        bool shiftKey = eventModifiers.contains(WebEvent::Modifier::ShiftKey);
+        bool ctrlKey = eventModifiers.contains(WebEvent::Modifier::ControlKey);
+        bool altKey = eventModifiers.contains(WebEvent::Modifier::AltKey);
+        bool metaKey = eventModifiers.contains(WebEvent::Modifier::MetaKey);
+        double force = 0.0;
+        SyntheticClickType syntheticClickType = SyntheticClickType::OneFingerTap;
+
+        m_page->mainFrame().eventHandler().mouseMoved(PlatformMouseEvent(
+            adjustedIntPoint,
+            adjustedIntPoint,
+            MouseButton::NoButton,
+            PlatformEvent::Type::MouseMoved,
+            0,
+            shiftKey,
+            ctrlKey,
+            altKey,
+            metaKey,
+            WallTime::now(),
+            force,
+            syntheticClickType
+        ));
+        m_page->mainFrame().eventHandler().handleMousePressEvent(PlatformMouseEvent(
+            adjustedIntPoint,
+            adjustedIntPoint,
+            MouseButton::LeftButton,
+            PlatformEvent::Type::MousePressed,
+            1,
+            shiftKey,
+            ctrlKey,
+            altKey,
+            metaKey,
+            WallTime::now(),
+            force,
+            syntheticClickType
+        ));
+        m_page->mainFrame().eventHandler().handleMouseReleaseEvent(PlatformMouseEvent(
+            adjustedIntPoint,
+            adjustedIntPoint,
+            MouseButton::LeftButton,
+            PlatformEvent::Type::MouseReleased,
+            1,
+            shiftKey,
+            ctrlKey,
+            altKey,
+            metaKey,
+            WallTime::now(),
+            force,
+            syntheticClickType
+        ));
+    }
+    completionHandler();
+}
 #endif
 
 void WebPage::cancelPointer(WebCore::PointerID pointerId, const WebCore::IntPoint& documentPoint)
@@ -3193,6 +3300,11 @@ void WebPage::sendMessageToTargetBackend(const String& targetId, const String& m
     m_inspectorTargetController->sendMessageToTargetBackend(targetId, message);
 }
 
+void WebPage::resumeInspectorIfPausedInNewWindow()
+{
+    m_page->inspectorController().resumeIfPausedInNewWindow();
+}
+
 void WebPage::insertNewlineInQuotedContent()
 {
     Frame& frame = m_page->focusController().focusedOrMainFrame();
@@ -3428,6 +3540,7 @@ void WebPage::didCompletePageTransition()
 void WebPage::show()
 {
     send(Messages::WebPageProxy::ShowPage());
+    m_page->inspectorController().didShowNewWindow();
 }
 
 void WebPage::setIsTakingSnapshotsForApplicationSuspension(bool isTakingSnapshotsForApplicationSuspension)
@@ -6539,6 +6652,9 @@ Ref<DocumentLoader> WebPage::createDocumentLoader(Frame& frame, const ResourceRe
             WebsitePoliciesData::applyToDocumentLoader(WTFMove(*m_pendingWebsitePolicies), documentLoader);
             m_pendingWebsitePolicies = WTF::nullopt;
         }
+    } else if (m_pendingFrameNavigationID) {
+        documentLoader->setNavigationID(m_pendingFrameNavigationID);
+        m_pendingFrameNavigationID = 0;
     }
 
     return documentLoader;
diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.h b/Source/WebKit/WebProcess/WebPage/WebPage.h
index 263ff7e54df6a834099c9a300fbd7f5548d8db24..f6dfe719f6c90ef4bb03b660bce49a2261dac59c 100644
--- a/Source/WebKit/WebProcess/WebPage/WebPage.h
+++ b/Source/WebKit/WebProcess/WebPage/WebPage.h
@@ -1187,6 +1187,7 @@ public:
     void connectInspector(const String& targetId, Inspector::FrontendChannel::ConnectionType);
     void disconnectInspector(const String& targetId);
     void sendMessageToTargetBackend(const String& targetId, const String& message);
+    void resumeInspectorIfPausedInNewWindow();
 
     void insertNewlineInQuotedContent();
 
@@ -1470,6 +1471,7 @@ private:
     // Actions
     void tryClose(CompletionHandler<void(bool)>&&);
     void platformDidReceiveLoadParameters(const LoadParameters&);
+    void loadRequestInFrameForInspector(LoadParameters&&, WebCore::FrameIdentifier);
     void loadRequest(LoadParameters&&);
     NO_RETURN void loadRequestWaitingForProcessLaunch(LoadParameters&&, URL&&, WebPageProxyIdentifier, bool);
     void loadData(LoadParameters&&);
@@ -1505,6 +1507,7 @@ private:
     void updatePotentialTapSecurityOrigin(const WebTouchEvent&, bool wasHandled);
 #elif ENABLE(TOUCH_EVENTS)
     void touchEvent(const WebTouchEvent&);
+    void fakeTouchTap(const WebCore::IntPoint& position, uint8_t modifiers, CompletionHandler<void()>&& completionHandler);
 #endif
 
     void cancelPointer(WebCore::PointerID, const WebCore::IntPoint&);
@@ -1622,9 +1625,7 @@ private:
     void countStringMatches(const String&, OptionSet<FindOptions>, uint32_t maxMatchCount);
     void replaceMatches(const Vector<uint32_t>& matchIndices, const String& replacementText, bool selectionOnly, CallbackID);
 
-#if USE(COORDINATED_GRAPHICS)
     void sendViewportAttributesChanged(const WebCore::ViewportArguments&);
-#endif
 
     void didChangeSelectedIndexForActivePopupMenu(int32_t newIndex);
     void setTextForActivePopupMenu(int32_t index);
@@ -2105,6 +2106,7 @@ private:
     UserActivity m_userActivity;
 
     uint64_t m_pendingNavigationID { 0 };
+    uint64_t m_pendingFrameNavigationID { 0 };
     Optional<WebsitePoliciesData> m_pendingWebsitePolicies;
 
     bool m_mainFrameProgressCompleted { false };
diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
index 155f1f4a4a96289e10871f22a5955070ed0ee58d..102de5cf6e9f673003e9179420e3344084f3e690 100644
--- a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
+++ b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
@@ -132,6 +132,7 @@ GenerateSyntheticEditingCommand(enum:uint8_t WebKit::SyntheticEditingCommandType
     ConnectInspector(String targetId, Inspector::FrontendChannel::ConnectionType connectionType)
     DisconnectInspector(String targetId)
     SendMessageToTargetBackend(String targetId, String message)
+    ResumeInspectorIfPausedInNewWindow();
 
 #if ENABLE(REMOTE_INSPECTOR)
     SetIndicating(bool indicating);
@@ -143,6 +144,7 @@ GenerateSyntheticEditingCommand(enum:uint8_t WebKit::SyntheticEditingCommandType
 #endif
 #if !ENABLE(IOS_TOUCH_EVENTS) && ENABLE(TOUCH_EVENTS)
     TouchEvent(WebKit::WebTouchEvent event)
+    FakeTouchTap(WebCore::IntPoint position, uint8_t modifiers) -> () Async
 #endif
 
     CancelPointer(WebCore::PointerID pointerId, WebCore::IntPoint documentPoint)
@@ -177,6 +179,7 @@ GenerateSyntheticEditingCommand(enum:uint8_t WebKit::SyntheticEditingCommandType
     LoadURLInFrame(URL url, String referrer, WebCore::FrameIdentifier frameID)
     LoadDataInFrame(IPC::DataReference data, String MIMEType, String encodingName, URL baseURL, WebCore::FrameIdentifier frameID)
     LoadRequest(struct WebKit::LoadParameters loadParameters)
+    LoadRequestInFrameForInspector(struct WebKit::LoadParameters loadParameters, WebCore::FrameIdentifier frameID)
     LoadRequestWaitingForProcessLaunch(struct WebKit::LoadParameters loadParameters, URL resourceDirectoryURL, WebKit::WebPageProxyIdentifier pageID, bool checkAssumedReadAccessToResourceURL)
     LoadData(struct WebKit::LoadParameters loadParameters)
     LoadAlternateHTML(struct WebKit::LoadParameters loadParameters)
diff --git a/Source/WebKit/WebProcess/WebPage/mac/WebPageMac.mm b/Source/WebKit/WebProcess/WebPage/mac/WebPageMac.mm
index a1729f5c6205d16d7fa998a6536a84c8fa480454..a23b742a0f5ef084f116b2e2c61e84605f63a2a7 100644
--- a/Source/WebKit/WebProcess/WebPage/mac/WebPageMac.mm
+++ b/Source/WebKit/WebProcess/WebPage/mac/WebPageMac.mm
@@ -832,21 +832,37 @@ String WebPage::platformUserAgent(const URL&) const
 
 bool WebPage::hoverSupportedByPrimaryPointingDevice() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    return !screenIsTouchPrimaryInputDevice();
+#else
     return true;
+#endif
 }
 
 bool WebPage::hoverSupportedByAnyAvailablePointingDevice() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    return !screenHasTouchDevice();
+#else
     return true;
+#endif
 }
 
 Optional<PointerCharacteristics> WebPage::pointerCharacteristicsOfPrimaryPointingDevice() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    if (screenIsTouchPrimaryInputDevice())
+        return PointerCharacteristics::Coarse;
+#endif
     return PointerCharacteristics::Fine;
 }
 
 OptionSet<PointerCharacteristics> WebPage::pointerCharacteristicsOfAllAvailablePointingDevices() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    if (screenHasTouchDevice())
+        return PointerCharacteristics::Coarse;
+#endif
     return PointerCharacteristics::Fine;
 }
 
diff --git a/Source/WebKit/WebProcess/WebPage/win/WebPageWin.cpp b/Source/WebKit/WebProcess/WebPage/win/WebPageWin.cpp
index fbfc1fd3ece09dc3dfd9300dc1d67f045942053b..08a671959b8483760771a790ad6793eb124a9495 100644
--- a/Source/WebKit/WebProcess/WebPage/win/WebPageWin.cpp
+++ b/Source/WebKit/WebProcess/WebPage/win/WebPageWin.cpp
@@ -43,6 +43,7 @@
 #include <WebCore/NotImplemented.h>
 #include <WebCore/Page.h>
 #include <WebCore/PlatformKeyboardEvent.h>
+#include <WebCore/PlatformScreen.h>
 #include <WebCore/PointerCharacteristics.h>
 #include <WebCore/Settings.h>
 #include <WebCore/SharedBuffer.h>
@@ -118,21 +119,37 @@ String WebPage::platformUserAgent(const URL&) const
 
 bool WebPage::hoverSupportedByPrimaryPointingDevice() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    return !screenIsTouchPrimaryInputDevice();
+#else
     return true;
+#endif
 }
 
 bool WebPage::hoverSupportedByAnyAvailablePointingDevice() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    return !screenHasTouchDevice();
+#else
     return true;
+#endif
 }
 
 Optional<PointerCharacteristics> WebPage::pointerCharacteristicsOfPrimaryPointingDevice() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    if (screenIsTouchPrimaryInputDevice())
+        return PointerCharacteristics::Coarse;
+#endif
     return PointerCharacteristics::Fine;
 }
 
 OptionSet<PointerCharacteristics> WebPage::pointerCharacteristicsOfAllAvailablePointingDevices() const
 {
+#if ENABLE(TOUCH_EVENTS)
+    if (screenHasTouchDevice())
+        return PointerCharacteristics::Coarse;
+#endif
     return PointerCharacteristics::Fine;
 }
 
diff --git a/Source/WebKit/WebProcess/WebProcess.cpp b/Source/WebKit/WebProcess/WebProcess.cpp
index b76f1195cee696b7581b16563be33526fac9da1c..51ef1bdaa4269cb740a2464da9ee3ba8a39d39ae 100644
--- a/Source/WebKit/WebProcess/WebProcess.cpp
+++ b/Source/WebKit/WebProcess/WebProcess.cpp
@@ -81,6 +81,7 @@
 #include "WebsiteData.h"
 #include "WebsiteDataStoreParameters.h"
 #include "WebsiteDataType.h"
+#include <JavaScriptCore/IdentifiersFactory.h>
 #include <JavaScriptCore/JSLock.h>
 #include <JavaScriptCore/MemoryStatistics.h>
 #include <JavaScriptCore/WasmFaultSignalHandler.h>
@@ -298,6 +299,8 @@ void WebProcess::initializeProcess(const AuxiliaryProcessInitializationParameter
     
     platformInitializeProcess(parameters);
     updateCPULimit();
+
+    Inspector::IdentifiersFactory::initializeWithProcessID(parameters.processIdentifier->toUInt64());
 }
 
 void WebProcess::initializeConnection(IPC::Connection* connection)
diff --git a/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in b/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in
index 68de7ad4d3a3d1990d0905f88abd67c23081ecf8..f2f9da8f5e14c51be7f9eecc2fd09e8ddd94a518 100644
--- a/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in
+++ b/Source/WebKit/WebProcess/com.apple.WebProcess.sb.in
@@ -1429,22 +1429,27 @@
 #include <WebKitAdditions/WebContentSandboxAdditionsMac.sb>
 #endif
 
-(when (defined? 'mach-bootstrap)
-    (allow mach-bootstrap
-        (apply-message-filter
-            (deny xpc-message-send (with telemetry))
-            (allow xpc-message-send (message-number
-                204
-                207
-                301
-                711
-                800
-                804
-                )
-            )
-        )
-    )
-)
+;;; Playwright: This requires an entitlement
+;;; that only exists in builds signed by Apple.
+;;; It looks like we can disable it for now
+;;; without side effects
+;;;
+;;; (when (defined? 'mach-bootstrap)
+;;;     (allow mach-bootstrap
+;;;         (apply-message-filter
+;;;             (deny xpc-message-send (with telemetry))
+;;;             (allow xpc-message-send (message-number
+;;;                 204
+;;;                 207
+;;;                 301
+;;;                 711
+;;;                 800
+;;;                 804
+;;;                 )
+;;;             )
+;;;         )
+;;;     )
+;;; )
 
 (when (defined? 'mach-kernel-endpoint)
     (allow mach-kernel-endpoint
diff --git a/Source/WebKit/WebProcess/win/WebProcessMainWin.cpp b/Source/WebKit/WebProcess/win/WebProcessMainWin.cpp
index 89bc159df35910abe133c68d71057cdfe1995cbb..aba8e9110a3ec4c59e9888b148e1e908d477cbe4 100644
--- a/Source/WebKit/WebProcess/win/WebProcessMainWin.cpp
+++ b/Source/WebKit/WebProcess/win/WebProcessMainWin.cpp
@@ -42,7 +42,9 @@ public:
     bool platformInitialize() override
     {
         if (SetProcessDpiAwarenessContextPtr())
-            SetProcessDpiAwarenessContextPtr()(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
+            // Playwright begin
+            SetProcessDpiAwarenessContextPtr()(DPI_AWARENESS_CONTEXT_UNAWARE);
+            // Playwright end
         else
             SetProcessDPIAware();
         return true;
diff --git a/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm b/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm
index 5e6fe8a0b8b8ddecbf80dbe3f5bae1318b086c67..d0818be5694661726f762aaadfb7aaecc255c167 100644
--- a/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm
+++ b/Source/WebKitLegacy/mac/WebView/WebHTMLView.mm
@@ -4227,7 +4227,7 @@ static BOOL currentScrollIsBlit(NSView *clipView)
     _private->handlingMouseDownEvent = NO;
 }
 
-#if ENABLE(TOUCH_EVENTS)
+#if ENABLE(IOS_TOUCH_EVENTS)
 
 - (void)touch:(WebEvent *)event
 {
diff --git a/Source/WebKitLegacy/mac/WebView/WebView.mm b/Source/WebKitLegacy/mac/WebView/WebView.mm
index 668c1ae00fb5621513f4154a81b50d9fecaa4df8..359e1097f374bb3b8bb7de21d23d9f31fc0c810d 100644
--- a/Source/WebKitLegacy/mac/WebView/WebView.mm
+++ b/Source/WebKitLegacy/mac/WebView/WebView.mm
@@ -4178,7 +4178,7 @@ IGNORE_WARNINGS_END
 }
 #endif // PLATFORM(IOS_FAMILY)
 
-#if ENABLE(TOUCH_EVENTS)
+#if ENABLE(IOS_TOUCH_EVENTS)
 
 - (NSArray *)_touchEventRegions
 {
@@ -4220,7 +4220,7 @@ IGNORE_WARNINGS_END
     }).autorelease();
 }
 
-#endif // ENABLE(TOUCH_EVENTS)
+#endif // ENABLE(IOS_TOUCH_EVENTS)
 
 // For backwards compatibility with the WebBackForwardList API, we honor both
 // a per-WebView and a per-preferences setting for whether to use the back/forward cache.
diff --git a/Source/cmake/FindLibVPX.cmake b/Source/cmake/FindLibVPX.cmake
new file mode 100644
index 0000000000000000000000000000000000000000..dd6a53e2d57318489b7e49dd7373706d5d9dc387
--- /dev/null
+++ b/Source/cmake/FindLibVPX.cmake
@@ -0,0 +1,25 @@
+# Find LibVPX
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBVPX REQUIRED vpx)
+
+find_path(LIBVPX_INCLUDE_DIRS
+    NAMES vpx/vp8.h
+    HINTS ${PC_LIBVPX_INCLUDEDIR}
+          ${PC_LIBVPX_INCLUDE_DIRS}
+)
+
+find_library(LIBVPX_LIBRARIES
+    NAMES vpx
+    HINTS ${PC_LIBVPX_LIBDIR}
+          ${PC_LIBVPX_LIBRARY_DIRS}
+)
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibVPX REQUIRED_VARS LIBVPX_INCLUDE_DIRS LIBVPX_LIBRARIES
+                                         VERSION_VAR   PC_LIBVPX_VERSION)
+
+mark_as_advanced(
+    LIBVPX_INCLUDE_DIRS
+    LIBVPX_LIBRARIES
+)
diff --git a/Source/cmake/OptionsGTK.cmake b/Source/cmake/OptionsGTK.cmake
index 2800be7b8392590f42b06b7d9b9633977aa350df..ad9efe97fdbcac92a66631e704e6ffe8d6737f75 100644
--- a/Source/cmake/OptionsGTK.cmake
+++ b/Source/cmake/OptionsGTK.cmake
@@ -6,6 +6,8 @@ WEBKIT_OPTION_DEFINE(USE_GTK4 "Whether to enable usage of GTK4 instead of GTK3."
 
 SET_PROJECT_VERSION(2 31 0)
 
+set(ENABLE_WEBKIT_LEGACY OFF)
+
 if (USE_GTK4)
     set(WEBKITGTK_API_VERSION 5.0)
     set(GTK_MINIMUM_VERSION 3.98.5)
@@ -55,6 +57,10 @@ find_package(EGL)
 find_package(OpenGL)
 find_package(OpenGLES2)
 
+# Playwright begin
+find_package(LibVPX REQUIRED)
+# Playwright end
+
 include(GStreamerDefinitions)
 
 SET_AND_EXPOSE_TO_BUILD(USE_ATK TRUE)
@@ -148,7 +154,7 @@ endif ()
 # without approval from a GTK reviewer. There must be strong reason to support
 # changing the value of the option.
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_DRAG_SUPPORT PUBLIC ON)
-WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_GAMEPAD PUBLIC ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_GAMEPAD PUBLIC OFF)
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_SPELLCHECK PUBLIC ON)
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_TOUCH_EVENTS PUBLIC ON)
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEB_CRYPTO PUBLIC ON)
@@ -189,6 +195,12 @@ WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_SHAREABLE_RESOURCE PRIVATE ON)
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEB_API_STATISTICS PRIVATE ON)
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEB_RTC PRIVATE ${ENABLE_EXPERIMENTAL_FEATURES})
 
+# Playwright
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_APPLICATION_MANIFEST PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_CSS_TRAILING_WORD PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_CURSOR_VISIBILITY PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_DOWNLOAD_ATTRIBUTE PRIVATE ON)
+
 include(GStreamerDependencies)
 
 # Finalize the value for all options. Do not attempt to use an option before
diff --git a/Source/cmake/OptionsWPE.cmake b/Source/cmake/OptionsWPE.cmake
index 5fbf72fe95cb148667207b39381bf90b377ad6b2..b544291ae00f9cecf2fa48d639a6449800519d52 100644
--- a/Source/cmake/OptionsWPE.cmake
+++ b/Source/cmake/OptionsWPE.cmake
@@ -3,6 +3,7 @@ include(VersioningUtils)
 
 SET_PROJECT_VERSION(2 31 0)
 set(WPE_API_VERSION 1.0)
+set(ENABLE_WEBKIT_LEGACY OFF)
 
 CALCULATE_LIBRARY_VERSIONS_FROM_LIBTOOL_TRIPLE(WEBKIT 15 0 12)
 
@@ -79,13 +80,20 @@ WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEBGL2 PRIVATE OFF)
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEB_RTC PRIVATE ${ENABLE_EXPERIMENTAL_FEATURES})
 WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEBXR PRIVATE ${ENABLE_EXPERIMENTAL_FEATURES})
 
+# Playwright
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_APPLICATION_MANIFEST PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_CSS_TRAILING_WORD PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_CURSOR_VISIBILITY PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_DARK_MODE_CSS PRIVATE ON)
+WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_DOWNLOAD_ATTRIBUTE PRIVATE ON)
+
 # Public options specific to the WPE port. Do not add any options here unless
 # there is a strong reason we should support changing the value of the option,
 # and the option is not relevant to any other WebKit ports.
 WEBKIT_OPTION_DEFINE(ENABLE_GTKDOC "Whether or not to use generate gtkdoc." PUBLIC OFF)
 WEBKIT_OPTION_DEFINE(USE_OPENJPEG "Whether to enable support for JPEG2000 images." PUBLIC ON)
 WEBKIT_OPTION_DEFINE(USE_WOFF2 "Whether to enable support for WOFF2 Web Fonts." PUBLIC ON)
-WEBKIT_OPTION_DEFINE(ENABLE_WPE_QT_API "Whether to enable support for the Qt5/QML plugin" PUBLIC ${ENABLE_DEVELOPER_MODE})
+WEBKIT_OPTION_DEFINE(ENABLE_WPE_QT_API "Whether to enable support for the Qt5/QML plugin" PUBLIC OFF)
 WEBKIT_OPTION_DEFINE(USE_SYSTEMD "Whether to enable journald logging" PUBLIC ON)
 
 # Private options specific to the WPE port.
diff --git a/Source/cmake/OptionsWin.cmake b/Source/cmake/OptionsWin.cmake
index f8f5e6734c691cade89a3416073689d057c5b39e..79136da42497ec7a88b44bd8098f65a7829c5980 100644
--- a/Source/cmake/OptionsWin.cmake
+++ b/Source/cmake/OptionsWin.cmake
@@ -7,8 +7,9 @@ add_definitions(-D_WINDOWS -DWINVER=0x601 -D_WIN32_WINNT=0x601)
 add_definitions(-DNOMINMAX)
 add_definitions(-DUNICODE -D_UNICODE)
 
+set(ENABLE_WEBKIT_LEGACY OFF)
+
 if ((NOT DEFINED ENABLE_WEBKIT_LEGACY) OR ENABLE_WEBKIT_LEGACY)
-    set(ENABLE_WEBKIT_LEGACY ON)
     set(ENABLE_WEBKIT OFF)
 endif ()
 
@@ -86,6 +87,13 @@ if (${WTF_PLATFORM_WIN_CAIRO})
     WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEBDRIVER PRIVATE ${ENABLE_EXPERIMENTAL_FEATURES})
     WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_WEB_CRYPTO PRIVATE ${ENABLE_EXPERIMENTAL_FEATURES})
 
+    # Playwright
+    WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_CSS_CONIC_GRADIENTS PRIVATE ON)
+    WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_CSS_TRAILING_WORD PRIVATE ON)
+    WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_DARK_MODE_CSS PRIVATE ON)
+    WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_DOWNLOAD_ATTRIBUTE PRIVATE ON)
+    WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_TOUCH_EVENTS PRIVATE ON)
+
     # FIXME: Implement plugin process on Modern WebKit. https://bugs.webkit.org/show_bug.cgi?id=185313
     WEBKIT_OPTION_DEFAULT_PORT_VALUE(ENABLE_NETSCAPE_PLUGIN_API PRIVATE OFF)
 else ()
diff --git a/Source/cmake/OptionsWinCairo.cmake b/Source/cmake/OptionsWinCairo.cmake
index bc7059b8640dc89efaa7bba164f41aaac4f658a0..49601573cd49e176866c7f13ae0bcb76bf8b6503 100644
--- a/Source/cmake/OptionsWinCairo.cmake
+++ b/Source/cmake/OptionsWinCairo.cmake
@@ -32,15 +32,36 @@ if (OpenJPEG_FOUND)
 endif ()
 
 find_package(WOFF2 1.0.2 COMPONENTS dec)
-if (WOFF2_FOUND)
-    SET_AND_EXPOSE_TO_BUILD(USE_WOFF2 ON)
-endif ()
+SET_AND_EXPOSE_TO_BUILD(USE_WOFF2 ON)
 
 find_package(WebP COMPONENTS demux)
 if (WebP_FOUND)
     SET_AND_EXPOSE_TO_BUILD(USE_WEBP ON)
 endif ()
 
+# Playwright begin
+if (NOT LIBVPX_PACKAGE_PATH)
+    set(LIBVPX_PACKAGE_PATH "C:\\vcpkg\\packages\\libvpx_x64-windows")
+endif()
+file(TO_CMAKE_PATH "${LIBVPX_PACKAGE_PATH}" LIBVPX_PACKAGE_PATH)
+message(STATUS "Using LIBVPX_PACKAGE_PATH = ${LIBVPX_PACKAGE_PATH}")
+
+find_library(LIBVPX_CUSTOM_LIBRARY vpxmd.lib
+    HINTS ${LIBVPX_PACKAGE_PATH}/lib
+    REQIRED
+    NO_DEFAULT_PATH
+)
+message(STATUS "Found LIBVPX_CUSTOM_LIBRARY = ${LIBVPX_CUSTOM_LIBRARY}")
+
+find_path(LIBVPX_CUSTOM_INCLUDE_DIR
+    NAMES vpx/vp8.h
+    HINTS ${LIBVPX_PACKAGE_PATH}/include
+    REQUIRED
+    NO_DEFAULT_PATH
+)
+message(STATUS "Found LIBVPX_CUSTOM_INCLUDE_DIR = ${LIBVPX_CUSTOM_INCLUDE_DIR}")
+# Playwright end
+
 # TODO: Add a check for HAVE_RSA_PSS for support of CryptoAlgorithmRSA_PSS
 # https://bugs.webkit.org/show_bug.cgi?id=206635
 
diff --git a/Tools/MiniBrowser/gtk/BrowserTab.c b/Tools/MiniBrowser/gtk/BrowserTab.c
index 3845eabba3e964f9e11bb0ffcb8726fd4ea96fc4..2e0e3929907d4760eb681c743984d4c83273880d 100644
--- a/Tools/MiniBrowser/gtk/BrowserTab.c
+++ b/Tools/MiniBrowser/gtk/BrowserTab.c
@@ -160,6 +160,11 @@ static void loadChanged(WebKitWebView *webView, WebKitLoadEvent loadEvent, Brows
 #endif
 }
 
+static gboolean loadFailed()
+{
+    return TRUE;
+}
+
 static GtkWidget *createInfoBarQuestionMessage(const char *title, const char *text)
 {
     GtkWidget *dialog = gtk_info_bar_new_with_buttons("No", GTK_RESPONSE_NO, "Yes", GTK_RESPONSE_YES, NULL);
@@ -623,6 +628,7 @@ static void browserTabConstructed(GObject *gObject)
     g_signal_connect(tab->webView, "notify::is-loading", G_CALLBACK(isLoadingChanged), tab);
     g_signal_connect(tab->webView, "decide-policy", G_CALLBACK(decidePolicy), tab);
     g_signal_connect(tab->webView, "load-changed", G_CALLBACK(loadChanged), tab);
+    g_signal_connect(tab->webView, "load-failed", G_CALLBACK(loadFailed), tab);
     g_signal_connect(tab->webView, "load-failed-with-tls-errors", G_CALLBACK(loadFailedWithTLSerrors), tab);
     g_signal_connect(tab->webView, "permission-request", G_CALLBACK(decidePermissionRequest), tab);
     g_signal_connect(tab->webView, "run-color-chooser", G_CALLBACK(runColorChooserCallback), tab);
@@ -668,6 +674,9 @@ static char *getInternalURI(const char *uri)
     if (g_str_has_prefix(uri, "about:") && !g_str_equal(uri, "about:blank"))
         return g_strconcat(BROWSER_ABOUT_SCHEME, uri + strlen ("about"), NULL);
 
+    if (!g_str_has_prefix(uri, "http://") && !g_str_has_prefix(uri, "https://") && !g_str_has_prefix(uri, "file://"))
+        return g_strconcat("http://", uri, NULL);
+
     return g_strdup(uri);
 }
 
diff --git a/Tools/MiniBrowser/gtk/BrowserWindow.c b/Tools/MiniBrowser/gtk/BrowserWindow.c
index dd212ab53ba83cb3eb6824aa4c6e14f1fdc7b478..14fead71704919ce49199ec438fa8f2d119a018d 100644
--- a/Tools/MiniBrowser/gtk/BrowserWindow.c
+++ b/Tools/MiniBrowser/gtk/BrowserWindow.c
@@ -1352,6 +1352,12 @@ static gboolean browserWindowDeleteEvent(GtkWidget *widget, GdkEventAny* event)
 }
 #endif
 
+static void zeroPreferredSize(GtkWidget* widget, gint* minimumSize, gint* naturalSize)
+{
+    *minimumSize = 10;
+    *naturalSize = 10;
+}
+
 static void browser_window_class_init(BrowserWindowClass *klass)
 {
     GObjectClass *gobjectClass = G_OBJECT_CLASS(klass);
@@ -1365,6 +1371,14 @@ static void browser_window_class_init(BrowserWindowClass *klass)
     GtkWidgetClass *widgetClass = GTK_WIDGET_CLASS(klass);
     widgetClass->delete_event = browserWindowDeleteEvent;
 #endif
+
+// Playwrigth begin
+    // Override preferred (which is minimum :-) size to 0 so that we can
+    // emulate arbitrary resolution.
+    GtkWidgetClass* browserWidgetClass = GTK_WIDGET_CLASS(klass);
+    browserWidgetClass->get_preferred_width = zeroPreferredSize;
+    browserWidgetClass->get_preferred_height = zeroPreferredSize;
+// Playwrigth end
 }
 
 /* Public API. */
diff --git a/Tools/MiniBrowser/gtk/BrowserWindow.h b/Tools/MiniBrowser/gtk/BrowserWindow.h
index 62629b4c1c25ae82bd797b39bbf9de0331f8eed2..5de7900a29b0e629f1ac404bbb0dc5b4e605294d 100644
--- a/Tools/MiniBrowser/gtk/BrowserWindow.h
+++ b/Tools/MiniBrowser/gtk/BrowserWindow.h
@@ -37,7 +37,7 @@ G_BEGIN_DECLS
 #define BROWSER_IS_WINDOW(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), BROWSER_TYPE_WINDOW))
 #define BROWSER_IS_WINDOW_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),  BROWSER_TYPE_WINDOW))
 #define BROWSER_WINDOW_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj),  BROWSER_TYPE_WINDOW, BrowserWindowClass))
-#define BROWSER_DEFAULT_URL            "http://www.webkitgtk.org/"
+#define BROWSER_DEFAULT_URL            "about:blank"
 #define BROWSER_ABOUT_SCHEME           "minibrowser-about"
 
 typedef struct _BrowserWindow        BrowserWindow;
diff --git a/Tools/MiniBrowser/gtk/main.c b/Tools/MiniBrowser/gtk/main.c
index dc53db0c258b0401e0a2dca43e0380f1074ce024..1eed53ed934952e921a69c9f62bcd34f380f9935 100644
--- a/Tools/MiniBrowser/gtk/main.c
+++ b/Tools/MiniBrowser/gtk/main.c
@@ -52,7 +52,12 @@ static const char *cookiesPolicy;
 static const char *proxy;
 static gboolean darkMode;
 static gboolean enableITP;
+static gboolean inspectorPipe;
+static gboolean headless;
+static gboolean noStartupWindow;
+static const char *userDataDir;
 static gboolean printVersion;
+static GtkApplication *browserApplication = NULL;
 
 typedef enum {
     MINI_BROWSER_ERROR_INVALID_ABOUT_PATH
@@ -144,6 +149,10 @@ static const GOptionEntry commandLineOptions[] =
     { "content-filter", 0, 0, G_OPTION_ARG_FILENAME, &contentFilter, "JSON with content filtering rules", "FILE" },
     { "enable-itp", 0, 0, G_OPTION_ARG_NONE, &enableITP, "Enable Intelligent Tracking Prevention (ITP)", NULL },
     { "version", 'v', 0, G_OPTION_ARG_NONE, &printVersion, "Print the WebKitGTK version", NULL },
+    { "inspector-pipe", 0, 0, G_OPTION_ARG_NONE, &inspectorPipe, "Open pipe connection to the remote inspector", NULL },
+    { "user-data-dir", 0, 0, G_OPTION_ARG_STRING, &userDataDir, "Default profile persistence folder location", NULL },
+    { "headless", 0, 0, G_OPTION_ARG_NONE, &headless, "Noop headless operation", NULL },
+    { "no-startup-window", 0, 0, G_OPTION_ARG_NONE, &noStartupWindow, "Do not open default page", NULL },
     { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &uriArguments, 0, "[URL…]" },
     { 0, 0, 0, 0, 0, 0, 0 }
 };
@@ -584,6 +593,48 @@ static void filterSavedCallback(WebKitUserContentFilterStore *store, GAsyncResul
     g_main_loop_quit(data->mainLoop);
 }
 
+static WebKitWebContext *persistentWebContext = NULL;
+
+static WebKitWebView *createNewPage(WebKitBrowserInspector *browser_inspector, WebKitWebContext *context)
+{
+    if (context == NULL)
+        context = persistentWebContext;
+
+    WebKitWebView *newWebView = WEBKIT_WEB_VIEW(g_object_new(WEBKIT_TYPE_WEB_VIEW,
+        "web-context", context,
+        "is-ephemeral", webkit_web_context_is_ephemeral(context),
+        "is-controlled-by-automation", TRUE,
+        NULL));
+    GtkWidget *newWindow = browser_window_new(NULL, context);
+    gtk_window_set_application(GTK_WINDOW(newWindow), browserApplication);
+    browser_window_append_view(BROWSER_WINDOW(newWindow), newWebView);
+    gtk_widget_grab_focus(GTK_WIDGET(newWebView));
+    gtk_widget_show(GTK_WIDGET(newWindow));
+    webkit_web_view_load_uri(newWebView, "about:blank");
+    return newWebView;
+}
+
+static void quitBroserApplication(WebKitBrowserInspector* browser_inspector)
+{
+    g_application_release(G_APPLICATION(browserApplication));
+}
+
+static void keepApplicationAliveUntilQuit(GApplication *application)
+{
+    // Reference the application, it will be released in quitBroserApplication.
+    g_application_hold(application);
+    WebKitBrowserInspector* browserInspector = webkit_browser_inspector_get_default();
+    g_signal_connect(browserInspector, "quit-application", G_CALLBACK(quitBroserApplication), NULL);
+}
+
+static void configureBrowserInspectorPipe()
+{
+    WebKitBrowserInspector* browserInspector = webkit_browser_inspector_get_default();
+    g_signal_connect(browserInspector, "create-new-page", G_CALLBACK(createNewPage), NULL);
+ 
+    webkit_browser_inspector_initialize_pipe(proxy, ignoreHosts);
+}
+
 static void startup(GApplication *application)
 {
     const char *actionAccels[] = {
@@ -614,10 +665,22 @@ static void startup(GApplication *application)
 
 static void activate(GApplication *application, WebKitSettings *webkitSettings)
 {
+    if (inspectorPipe)
+        configureBrowserInspectorPipe();
+
+    if (noStartupWindow) {
+        keepApplicationAliveUntilQuit(application);
+        g_clear_object(&webkitSettings);
+        return;
+    }
+
     WebKitWebsiteDataManager *manager;
-    if (privateMode || automationMode)
+    if (userDataDir) {
+        manager = webkit_website_data_manager_new("base-data-directory", userDataDir, "base-cache-directory", userDataDir, NULL);
+        cookiesFile = g_build_filename(userDataDir, "cookies.txt", NULL);
+    } else if (inspectorPipe || privateMode || automationMode) {
         manager = webkit_website_data_manager_new_ephemeral();
-    else {
+    } else {
         char *dataDirectory = g_build_filename(g_get_user_data_dir(), "webkitgtk-" WEBKITGTK_API_VERSION_STRING, "MiniBrowser", NULL);
         char *cacheDirectory = g_build_filename(g_get_user_cache_dir(), "webkitgtk-" WEBKITGTK_API_VERSION_STRING, "MiniBrowser", NULL);
         manager = webkit_website_data_manager_new("base-data-directory", dataDirectory, "base-cache-directory", cacheDirectory, NULL);
@@ -641,6 +704,7 @@ static void activate(GApplication *application, WebKitSettings *webkitSettings)
         "use-system-appearance-for-scrollbars", FALSE,
 #endif
         NULL);
+    persistentWebContext = webContext;
     g_object_unref(manager);
 
     if (cookiesPolicy) {
@@ -716,9 +780,7 @@ static void activate(GApplication *application, WebKitSettings *webkitSettings)
             WebKitWebView *webView = createBrowserTab(mainWindow, webkitSettings, userContentManager, defaultWebsitePolicies);
             if (!i)
                 firstTab = GTK_WIDGET(webView);
-            gchar *url = argumentToURL(uriArguments[i]);
-            webkit_web_view_load_uri(webView, url);
-            g_free(url);
+            webkit_web_view_load_uri(webView, uriArguments[i]);
         }
     } else {
         WebKitWebView *webView = createBrowserTab(mainWindow, webkitSettings, userContentManager, defaultWebsitePolicies);
@@ -791,9 +853,11 @@ int main(int argc, char *argv[])
     }
 
     GtkApplication *application = gtk_application_new(NULL, G_APPLICATION_FLAGS_NONE);
+    browserApplication = application;
     g_signal_connect(application, "startup", G_CALLBACK(startup), NULL);
     g_signal_connect(application, "activate", G_CALLBACK(activate), webkitSettings);
     g_application_run(G_APPLICATION(application), 0, NULL);
+    browserApplication = NULL;
     g_object_unref(application);
 
     return 0;
diff --git a/Tools/MiniBrowser/wpe/main.cpp b/Tools/MiniBrowser/wpe/main.cpp
index 2ab04ce061cffbfcbbc4e64c6683996b672abbce..2d105be12aa764a538132c8a7cf19b4ea8ec5099 100644
--- a/Tools/MiniBrowser/wpe/main.cpp
+++ b/Tools/MiniBrowser/wpe/main.cpp
@@ -40,6 +40,9 @@ static gboolean headlessMode;
 static gboolean privateMode;
 static gboolean automationMode;
 static gboolean ignoreTLSErrors;
+static gboolean inspectorPipe;
+static gboolean noStartupWindow;
+static const char* userDataDir;
 static const char* contentFilter;
 static const char* cookiesFile;
 static const char* cookiesPolicy;
@@ -63,6 +66,9 @@ static const GOptionEntry commandLineOptions[] =
     { "bg-color", 0, 0, G_OPTION_ARG_STRING, &bgColor, "Window background color. Default: white", "COLOR" },
     { "enable-itp", 0, 0, G_OPTION_ARG_NONE, &enableITP, "Enable Intelligent Tracking Prevention (ITP)", nullptr },
     { "version", 'v', 0, G_OPTION_ARG_NONE, &printVersion, "Print the WPE version", nullptr },
+    { "inspector-pipe", 'v', 0, G_OPTION_ARG_NONE, &inspectorPipe, "Expose remote debugging protocol over pipe", nullptr },
+    { "user-data-dir", 0, 0, G_OPTION_ARG_STRING, &userDataDir, "Default profile persistence folder location", "FILE" },
+    { "no-startup-window", 0, 0, G_OPTION_ARG_NONE, &noStartupWindow, "Do not open default page", nullptr },
     { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &uriArguments, nullptr, "[URL]" },
     { nullptr, 0, 0, G_OPTION_ARG_NONE, nullptr, nullptr, nullptr }
 };
@@ -147,13 +153,34 @@ static void filterSavedCallback(WebKitUserContentFilterStore *store, GAsyncResul
     g_main_loop_quit(data->mainLoop);
 }
 
+static gboolean webViewLoadFailed()
+{
+    return TRUE;
+}
+
 static void webViewClose(WebKitWebView* webView, gpointer)
 {
     // Hash table key delete func takes care of unref'ing the view
     g_hash_table_remove(openViews, webView);
 }
 
-static WebKitWebView* createWebView(WebKitWebView* webView, WebKitNavigationAction*, gpointer)
+static gboolean scriptDialog(WebKitWebView*, WebKitScriptDialog* dialog, gpointer)
+{
+    if (inspectorPipe)
+        webkit_script_dialog_ref(dialog);
+    return TRUE;
+}
+
+static gboolean scriptDialogHandled(WebKitWebView*, WebKitScriptDialog* dialog, gpointer)
+{
+    if (inspectorPipe)
+        webkit_script_dialog_unref(dialog);
+    return TRUE;
+}
+
+static WebKitWebView* createWebView(WebKitWebView* webView, WebKitNavigationAction*, gpointer);
+
+static WebKitWebView* createWebViewImpl(WebKitWebView* webView, WebKitWebContext *webContext)
 {
     auto backend = createViewBackend(1280, 720);
     struct wpe_view_backend* wpeBackend = backend->backend();
@@ -165,17 +192,66 @@ static WebKitWebView* createWebView(WebKitWebView* webView, WebKitNavigationActi
             delete static_cast<WPEToolingBackends::ViewBackend*>(data);
         }, backend.release());
 
-    auto* newWebView = webkit_web_view_new_with_related_view(viewBackend, webView);
-    webkit_web_view_set_settings(newWebView, webkit_web_view_get_settings(webView));
+// Playwright begin
+    if (headlessMode) {
+        webkit_web_view_backend_set_screenshot_callback(viewBackend,
+            [](gpointer data) {
+                return static_cast<WPEToolingBackends::HeadlessViewBackend*>(data)->snapshot();
+            });
+    }
+// Playwright end
+    WebKitWebView* newWebView;
+    if (webView) {
+        newWebView = webkit_web_view_new_with_related_view(viewBackend, webView);
+    } else {
+        newWebView = WEBKIT_WEB_VIEW(g_object_new(WEBKIT_TYPE_WEB_VIEW,
+            "backend", viewBackend,
+            "web-context", webContext,
+            nullptr));
+    }
 
     g_signal_connect(newWebView, "create", G_CALLBACK(createWebView), nullptr);
     g_signal_connect(newWebView, "close", G_CALLBACK(webViewClose), nullptr);
 
     g_hash_table_add(openViews, newWebView);
 
+    g_signal_connect(newWebView, "load-failed", G_CALLBACK(webViewLoadFailed), nullptr);
+    g_signal_connect(newWebView, "script-dialog", G_CALLBACK(scriptDialog), nullptr);
+    g_signal_connect(newWebView, "script-dialog-handled", G_CALLBACK(scriptDialogHandled), nullptr);
+    g_signal_connect(newWebView, "create", G_CALLBACK(createWebView), nullptr);
     return newWebView;
 }
 
+static WebKitWebView* createWebView(WebKitWebView* webView, WebKitNavigationAction*, gpointer)
+{
+    return createWebViewImpl(webView, nullptr);
+}
+
+static WebKitWebContext *persistentWebContext = NULL;
+
+static WebKitWebView* createNewPage(WebKitBrowserInspector*, WebKitWebContext *webContext)
+{
+    if (!webContext)
+        webContext = persistentWebContext;
+    WebKitWebView* webView = createWebViewImpl(nullptr, webContext);
+    webkit_web_view_load_uri(webView, "about:blank");
+    return webView;
+}
+
+static void quitBroserApplication(WebKitBrowserInspector* browser_inspector, gpointer data)
+{
+    GMainLoop* mainLoop = static_cast<GMainLoop*>(data);
+    g_main_loop_quit(mainLoop);
+}
+
+static void configureBrowserInspector(GMainLoop* mainLoop)
+{
+    WebKitBrowserInspector* browserInspector = webkit_browser_inspector_get_default();
+    g_signal_connect(browserInspector, "create-new-page", G_CALLBACK(createNewPage), NULL);
+    g_signal_connect(browserInspector, "quit-application", G_CALLBACK(quitBroserApplication), mainLoop);
+    webkit_browser_inspector_initialize_pipe(proxy, ignoreHosts);
+}
+
 int main(int argc, char *argv[])
 {
 #if ENABLE_DEVELOPER_MODE
@@ -207,6 +283,16 @@ int main(int argc, char *argv[])
     }
 
     auto* loop = g_main_loop_new(nullptr, FALSE);
+    if (inspectorPipe)
+        configureBrowserInspector(loop);
+
+    openViews = g_hash_table_new_full(nullptr, nullptr, g_object_unref, nullptr);
+
+    if (noStartupWindow) {
+        g_main_loop_run(loop);
+        g_main_loop_unref(loop);
+        return 0;
+    }
 
     auto backend = createViewBackend(1280, 720);
     struct wpe_view_backend* wpeBackend = backend->backend();
@@ -216,7 +302,15 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    auto* manager = (privateMode || automationMode) ? webkit_website_data_manager_new_ephemeral() : webkit_website_data_manager_new(nullptr);
+    WebKitWebsiteDataManager *manager;
+    if (userDataDir) {
+        manager = webkit_website_data_manager_new("base-data-directory", userDataDir, "base-cache-directory", userDataDir, NULL);
+        cookiesFile = g_build_filename(userDataDir, "cookies.txt", NULL);
+    } else if (inspectorPipe || privateMode || automationMode) {
+        manager = webkit_website_data_manager_new_ephemeral();
+    } else {
+        manager = webkit_website_data_manager_new(NULL);
+    }
     webkit_website_data_manager_set_itp_enabled(manager, enableITP);
 
     if (proxy) {
@@ -228,7 +322,8 @@ int main(int argc, char *argv[])
     if (ignoreTLSErrors)
         webkit_website_data_manager_set_tls_errors_policy(manager, WEBKIT_TLS_ERRORS_POLICY_IGNORE);
 
-    auto* webContext = webkit_web_context_new_with_website_data_manager(manager);
+    WebKitWebContext *webContext = WEBKIT_WEB_CONTEXT(g_object_new(WEBKIT_TYPE_WEB_CONTEXT, "website-data-manager", manager, "process-swap-on-cross-site-navigation-enabled", TRUE, NULL));
+    persistentWebContext = webContext;
     g_object_unref(manager);
 
     if (cookiesPolicy) {
@@ -287,7 +382,14 @@ int main(int argc, char *argv[])
     auto* viewBackend = webkit_web_view_backend_new(wpeBackend, [](gpointer data) {
         delete static_cast<WPEToolingBackends::ViewBackend*>(data);
     }, backend.release());
-
+// Playwright begin
+    if (headlessMode) {
+        webkit_web_view_backend_set_screenshot_callback(viewBackend,
+            [](gpointer data) {
+                return static_cast<WPEToolingBackends::HeadlessViewBackend*>(data)->snapshot();
+            });
+    }
+// Playwright end
     auto* webView = WEBKIT_WEB_VIEW(g_object_new(WEBKIT_TYPE_WEB_VIEW,
         "backend", viewBackend,
         "web-context", webContext,
@@ -304,8 +406,6 @@ int main(int argc, char *argv[])
         backendPtr->setAccessibleChild(ATK_OBJECT(accessible));
 #endif
 
-    openViews = g_hash_table_new_full(nullptr, nullptr, g_object_unref, nullptr);
-
     webkit_web_context_set_automation_allowed(webContext, automationMode);
     g_signal_connect(webContext, "automation-started", G_CALLBACK(automationStartedCallback), webView);
     g_signal_connect(webView, "permission-request", G_CALLBACK(decidePermissionRequest), nullptr);
@@ -318,16 +418,9 @@ int main(int argc, char *argv[])
         webkit_web_view_set_background_color(webView, &color);
 
     if (uriArguments) {
-        const char* uri = uriArguments[0];
-        if (g_str_equal(uri, "about:gpu"))
-            uri = "webkit://gpu";
-
-        GFile* file = g_file_new_for_commandline_arg(uri);
-        char* url = g_file_get_uri(file);
-        g_object_unref(file);
-        webkit_web_view_load_uri(webView, url);
-        g_free(url);
-    } else if (automationMode)
+        // Playwright: avoid weird url transformation like http://trac.webkit.org/r240840
+        webkit_web_view_load_uri(webView, uriArguments[0]);
+    } else if (automationMode || inspectorPipe)
         webkit_web_view_load_uri(webView, "about:blank");
     else
         webkit_web_view_load_uri(webView, "https://wpewebkit.org");
@@ -337,8 +430,7 @@ int main(int argc, char *argv[])
     g_hash_table_destroy(openViews);
 
 
-    if (privateMode || automationMode)
-        g_object_unref(webContext);
+    g_object_unref(webContext);
     g_main_loop_unref(loop);
 
     return 0;
diff --git a/Tools/PlatformWin.cmake b/Tools/PlatformWin.cmake
index ef4407cfc114e602d98ed81724da504f453e258f..448dd483715162baba484f756fbcc1d72de4ba0c 100644
--- a/Tools/PlatformWin.cmake
+++ b/Tools/PlatformWin.cmake
@@ -12,4 +12,5 @@ endif ()
 
 if (ENABLE_WEBKIT)
     add_subdirectory(WebKitTestRunner)
+    add_subdirectory(Playwright/win)
 endif ()
diff --git a/Tools/Scripts/build-webkit b/Tools/Scripts/build-webkit
index ddc2a96ac68cd51d5f4efeca78a118db91709aa2..57a78f54e72d264daa27faa53ac2a30cab98dd82 100755
--- a/Tools/Scripts/build-webkit
+++ b/Tools/Scripts/build-webkit
@@ -247,7 +247,7 @@ if (isAppleCocoaWebKit()) {
     push @projects, ("Source/WebKit");
 
     if (!isEmbeddedWebKit()) {
-        push @projects, ("Tools/MiniBrowser");
+        push @projects, ("Tools/Playwright");
 
         # WebInspectorUI must come after JavaScriptCore and WebCore but before WebKit and WebKit2
         my $webKitIndex = first { $projects[$_] eq "Source/WebKitLegacy" } 0..$#projects;
diff --git a/Tools/WebKitTestRunner/PlatformGTK.cmake b/Tools/WebKitTestRunner/PlatformGTK.cmake
index 6f8366b63e43eca6b95b67bb47fee9e7a1970cf9..cc8299dfa4380b833e79a870779a222059579d3b 100644
--- a/Tools/WebKitTestRunner/PlatformGTK.cmake
+++ b/Tools/WebKitTestRunner/PlatformGTK.cmake
@@ -26,6 +26,7 @@ list(APPEND WebKitTestRunner_LIBRARIES
     ${GLIB_LIBRARIES}
     Cairo::Cairo
     GTK::GTK
+    stdc++fs
 )
 
 list(APPEND WebKitTestRunnerInjectedBundle_LIBRARIES
diff --git a/Tools/WebKitTestRunner/PlatformWPE.cmake b/Tools/WebKitTestRunner/PlatformWPE.cmake
index 775b41868718ea6734efc9082f8161eee2e0015e..68a720c0cb01d534653a259536c481683873680d 100644
--- a/Tools/WebKitTestRunner/PlatformWPE.cmake
+++ b/Tools/WebKitTestRunner/PlatformWPE.cmake
@@ -31,6 +31,7 @@ list(APPEND WebKitTestRunner_LIBRARIES
     ${WPEBACKEND_FDO_LIBRARIES}
     Cairo::Cairo
     WPEToolingBackends
+    stdc++fs
 )
 
 list(APPEND WebKitTestRunnerInjectedBundle_LIBRARIES
diff --git a/Tools/WebKitTestRunner/TestController.cpp b/Tools/WebKitTestRunner/TestController.cpp
index 16ad17e24ba3eb1de77379efb8524b866e3c7b67..2a89217e90b67a35e1e6ee51c5d64e44ac0fdba5 100644
--- a/Tools/WebKitTestRunner/TestController.cpp
+++ b/Tools/WebKitTestRunner/TestController.cpp
@@ -724,7 +724,8 @@ void TestController::createWebViewWithOptions(const TestOptions& options)
         0, // didResignInputElementStrongPasswordAppearance
         0, // requestStorageAccessConfirm
         shouldAllowDeviceOrientationAndMotionAccess,
-        runWebAuthenticationPanel
+        runWebAuthenticationPanel,
+        0 // handleJavaScriptDialog
     };
     WKPageSetPageUIClient(m_mainWebView->page(), &pageUIClient.base);
 
diff --git a/Tools/WebKitTestRunner/mac/EventSenderProxy.mm b/Tools/WebKitTestRunner/mac/EventSenderProxy.mm
index 10272884084d2c10208cfa0714f1b10c5efc0a0b..fca38337665e206b40fc3f620c408b249d696701 100644
--- a/Tools/WebKitTestRunner/mac/EventSenderProxy.mm
+++ b/Tools/WebKitTestRunner/mac/EventSenderProxy.mm
@@ -873,4 +873,51 @@ void EventSenderProxy::mouseScrollByWithWheelAndMomentumPhases(int x, int y, int
     }
 }
 
+#if ENABLE(TOUCH_EVENTS)
+void EventSenderProxy::addTouchPoint(int, int)
+{
+}
+
+void EventSenderProxy::updateTouchPoint(int, int, int)
+{
+}
+
+void EventSenderProxy::touchStart()
+{
+}
+
+void EventSenderProxy::touchMove()
+{
+}
+
+void EventSenderProxy::touchEnd()
+{
+}
+
+void EventSenderProxy::touchCancel()
+{
+}
+
+void EventSenderProxy::clearTouchPoints()
+{
+}
+
+void EventSenderProxy::releaseTouchPoint(int)
+{
+}
+
+void EventSenderProxy::cancelTouchPoint(int)
+{
+}
+
+void EventSenderProxy::setTouchPointRadius(int, int)
+{
+}
+
+void EventSenderProxy::setTouchModifier(WKEventModifiers, bool)
+{
+}
+#endif // ENABLE(TOUCH_EVENTS)
+
+
 } // namespace WTR
diff --git a/Tools/win/DLLLauncher/DLLLauncherMain.cpp b/Tools/win/DLLLauncher/DLLLauncherMain.cpp
index 39238ac08dbcab92fb1d053928938a96f154c9b1..64bc9f1458254322dca9005b5e2d2b19bb901386 100644
--- a/Tools/win/DLLLauncher/DLLLauncherMain.cpp
+++ b/Tools/win/DLLLauncher/DLLLauncherMain.cpp
@@ -96,11 +96,9 @@ static bool prependPath(const wstring& directoryToPrepend)
 static int fatalError(const wstring& programName, const wstring& message)
 {
     wstring caption = programName + L" can't open.";
-#if USE_CONSOLE_ENTRY_POINT
+// Playwright begin
     fwprintf(stderr, L"%s\n%s\n", caption.c_str(), message.c_str());
-#else
-    ::MessageBoxW(0, message.c_str(), caption.c_str(), MB_ICONERROR);
-#endif
+// Playwright end
     return 1;
 }
 
diff --git a/Tools/wpe/backends/HeadlessViewBackend.cpp b/Tools/wpe/backends/HeadlessViewBackend.cpp
index c09b6f39f894943f11b7a453428fab7d6f6e68fb..bc21acb648562ee0380811599b08f7d26c3e706a 100644
--- a/Tools/wpe/backends/HeadlessViewBackend.cpp
+++ b/Tools/wpe/backends/HeadlessViewBackend.cpp
@@ -145,27 +145,24 @@ void HeadlessViewBackend::updateSnapshot(struct wpe_fdo_shm_exported_buffer* exp
             return;
     }
 
-    uint32_t bufferStride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, m_width);
-    uint8_t* buffer = new uint8_t[bufferStride * m_height];
-    memset(buffer, 0, bufferStride * m_height);
+    uint32_t width = std::max(0, wl_shm_buffer_get_width(shmBuffer));
+    uint32_t height = std::max(0, wl_shm_buffer_get_height(shmBuffer));
+    if (!width || !height) {
+        fprintf(stderr, "HeadlessViewBackend::updateSnapshot shmBuffer is empty: %ux%u\n", width, height);
+        return;
+    }
 
+    uint32_t bufferStride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
+    uint32_t stride = std::max(0, wl_shm_buffer_get_stride(shmBuffer));
+    if (bufferStride != stride) {
+        fprintf(stderr, "bufferStride != stride: %u != %u\n", bufferStride, stride);
+        return;
+    }
+    uint8_t* buffer = new uint8_t[bufferStride * height];
     {
-        uint32_t width = std::min<uint32_t>(m_width, std::max(0, wl_shm_buffer_get_width(shmBuffer)));
-        uint32_t height = std::min<uint32_t>(m_height, std::max(0, wl_shm_buffer_get_height(shmBuffer)));
-        uint32_t stride = std::max(0, wl_shm_buffer_get_stride(shmBuffer));
-
         wl_shm_buffer_begin_access(shmBuffer);
         auto* data = static_cast<uint8_t*>(wl_shm_buffer_get_data(shmBuffer));
-
-        for (uint32_t y = 0; y < height; ++y) {
-            for (uint32_t x = 0; x < width; ++x) {
-                buffer[bufferStride * y + 4 * x + 0] = data[stride * y + 4 * x + 0];
-                buffer[bufferStride * y + 4 * x + 1] = data[stride * y + 4 * x + 1];
-                buffer[bufferStride * y + 4 * x + 2] = data[stride * y + 4 * x + 2];
-                buffer[bufferStride * y + 4 * x + 3] = data[stride * y + 4 * x + 3];
-            }
-        }
-
+        memcpy(buffer, data, bufferStride * height);
         wl_shm_buffer_end_access(shmBuffer);
     }
 
@@ -173,7 +170,7 @@ void HeadlessViewBackend::updateSnapshot(struct wpe_fdo_shm_exported_buffer* exp
         cairo_surface_destroy(m_snapshot);
 
     m_snapshot = cairo_image_surface_create_for_data(buffer, CAIRO_FORMAT_ARGB32,
-        m_width, m_height, cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, m_width));
+        width, height, cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width));
 
     static cairo_user_data_key_t bufferKey;
     cairo_surface_set_user_data(m_snapshot, &bufferKey, buffer,