[Webkit-unassigned] [Bug 221880] Add experimental support for CSS Color 5 Relative Color Syntax

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221880

--- Comment #1 from Sam Weinig <sam at webkit.org> ---
Created attachment 420255

  --> https://bugs.webkit.org/attachment.cgi?id=420255&action=review

WIP

WIP. This adds parsing and resolving for all relative colors with a few main things missing:

- Doesn't support calc() using the component identifiers - e.g `color: hsl(from red calc(h+180) s l)`.
- Doesn't support system keywords.

It's also got a bunch of housekeeping that can go in first, so I am going to break it up to actually land what is here.

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