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[css-scrollbar] Add text for contrast concern of scrollbar colors #3113

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Sep 19, 2018
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[css-scrollbar] Add text for contrast concern of scrollbar colors #3113

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6 changes: 6 additions & 0 deletions css-scrollbars-1/Overview.bs
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Expand Up @@ -114,6 +114,12 @@ PNG of the same in a browser that supports it currently)
Implementations may ignore any of the colors
if the corresponding part do not exist on the underlying platform.

When using scrollbar-color property with specific color values,
authors should ensure the specified colors have enough contrast between them.
For keyword values, UAs should ensure the colors they use have enough contrast.
See <a href="https://www.w3.org/TR/WCAG20-TECHS/G183.html">
Techniques for WCAG 2.0: G183: Using a contrast ratio of 3:1 […]</a> [[WCAG20]].

Note: when a user interacts with a scrollbar (e.g. hovering or activating),
implementations may alter which scrollbar colors apply to which scrollbar parts.

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