[Webkit-unassigned] [Bug 138196] Implement :role pseudo selector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138196

--- Comment #6 from Dean Jackson <dino at apple.com> ---
Copying some info from Ben into here:

Implementing this would involve: extending the CSS Parser to parse :role(), extend CSSSelector to store the information about :role(), extend Element to expose the active role, match the CSSSelector with the active role, ensure the correct style invalidation when the role changes.
Since this is a new feature, this also involves writing *a lot* of tests.

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