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Merge pull request #12521 from twbs/outline-none-note
add note to CONTRIBUTING.md about `outline: none`
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@ -174,6 +174,7 @@ license your work under the terms of the [MIT License](LICENSE.md).
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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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- Except in rare cases, don't remove default `:focus` styles (via e.g. `outline: none;`) without providing alternative styles. See [this A11Y Project post](http://a11yproject.com/posts/never-remove-css-outlines/) for more details.
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### JS
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