add WCAG color guideline to CONTRIBUTING.md

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Chris Rebert 2014-01-23 14:01:59 -08:00
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@ -172,6 +172,7 @@ license your work under the terms of the [MIT License](LICENSE.md).
- Attribute selectors should only be used where absolutely necessary (e.g., form controls) and should be avoided on custom components for performance and explicitness.
- 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`).
- Avoid inheritance and over nesting—use single, explicit classes whenever possible.
- 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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