bootstrap/scss/_transitions.scss

.fade {
  @include transition($transition-fade);

  &:not(.show) {
    opacity: 0;
  }
}

.collapse {
  &:not(.show) {
    display: none;
  }
}

.collapsing {
  height: 0;
  overflow: hidden;
  @include transition($transition-collapse);
}
breaking out patterns.less even more, removing unnecessary div from checkbox and radio lists--now just labels and inputs 2012-01-06 02:01:42 +08:00			`.fade {`
Add variables for transitions (#21345) * Add variables for transitions * Add variables for transitions 2016-12-20 12:33:17 +08:00			`@include transition($transition-fade);`
convert to scss 2014-12-03 06:02:35 +08:00
Collapse with flex elements - simple approach (#25806) * #22600: prevent display:block for visible content * allow transition for elements with show class 2018-03-13 00:40:30 +08:00			`&:not(.show) {`
			`opacity: 0;`
breaking out patterns.less even more, removing unnecessary div from checkbox and radio lists--now just labels and inputs 2012-01-06 02:01:42 +08:00			`}`
			`}`

Remove commented out code and properly nest CSS again for .collapse 2013-05-24 12:06:02 +08:00			`.collapse {`
Collapse with flex elements - simple approach (#25806) * #22600: prevent display:block for visible content * allow transition for elements with show class 2018-03-13 00:40:30 +08:00			`&:not(.show) {`
			`display: none;`
Fixes #20566 (#20768) 2016-10-03 12:23:04 +08:00			`}`
change how collapse works - collapse, collapsing, and in 2013-07-27 11:34:39 +08:00			`}`
Fixes #12593: Add support for table bodies and table rows to the collapse plugin 2014-03-04 13:39:53 +08:00
change how collapse works - collapse, collapsing, and in 2013-07-27 11:34:39 +08:00			`.collapsing {`
breaking out patterns.less even more, removing unnecessary div from checkbox and radio lists--now just labels and inputs 2012-01-06 02:01:42 +08:00			`height: 0;`
make component animations work cross browsers with opacity mixin, restore float on thumbnails > li 2012-04-24 21:39:14 +08:00			`overflow: hidden;`
Add variables for transitions (#21345) * Add variables for transitions * Add variables for transitions 2016-12-20 12:33:17 +08:00			`@include transition($transition-collapse);`
Do not use filters in fade animations 2012-05-21 08:56:57 +08:00			`}`