[w3ctag/design-reviews] Relative Color Syntax (RCS) (Issue #894)

こんにちは TAG-さん!

I'm requesting a TAG review of Relative Color Syntax (RCS).

The new relative color syntax extends modern color syntax to allow existing colors to be modified using the color functions: if an origin color is specified, then each color channel can either be directly specified, or taken from the origin color (and possibly modified with math functions). For example:

`lab(from magenta calc(l/2) a b)`

Would create a `lab` color that is equivalent to magenta with half of the luminance.

  - Explainer : https://www.stefanjudis.com/notes/new-in-css-relative-colors/
  - Specification URL: https://www.w3.org/TR/css-color-5/#relative-colors
  - Tests:
    - https://github.com/web-platform-tests/wpt/blob/master/css/css-color/parsing/color-computed-relative-color.html
    - https://github.com/web-platform-tests/wpt/blob/master/css/css-color/parsing/color-valid-relative-color.html
    - https://github.com/web-platform-tests/wpt/blob/master/css/css-color/parsing/color-invalid-relative-color.html
    - https://github.com/web-platform-tests/wpt/blob/master/css/css-color/parsing/relative-color-out-of-gamut.html
  - Primary contacts (and their relationship to the specification):
      - Chris Lilley [svgeesus](https://github.com/svgeesus) W3C 
      - Adam Argyle [argyleink](https://github.com/argyleink) Chromium 
  - Organization(s)/project(s) driving the specification: W3C, Webkit, Chromium
  - Key pieces of existing multi-stakeholder review or discussion of this specification: Original proposal here https://github.com/w3c/csswg-drafts/issues/3187
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5205844613922816

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the work on this specification is currently being done: [csswg-drafts](https://github.com/w3c/csswg-drafts)
  - Major unresolved issues with or opposition to this specification: None
  - This work is being funded by: Google


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