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			Merge pull request #12356 from twbs/wcag-contributing
add WCAG color guideline to CONTRIBUTING.md
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			@ -173,6 +173,7 @@ license your work under the terms of the [MIT License](LICENSE.md).
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- Attribute selectors should only be used where absolutely necessary (e.g., form controls) and should be avoided on custom components for performance and explicitness.
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- Series of classes for a component should include a base class (e.g., `.component`) and use the base class as a prefix for modifier and sub-components (e.g., `.component-lg`).
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- Avoid inheritance and over nesting—use single, explicit classes whenever possible.
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- When feasible, default color palettes should comply with [WCAG color contrast guidelines](http://www.w3.org/TR/WCAG20/#visual-audio-contrast).
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### JS
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