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 lightness.

• Explainer : https://github.com/w3c/csswg-drafts/blob/main/css-color-5/RCS-Explainer.md
• 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 W3C
  • Una Kravets una Google
  • Lea Verou LeaVerou Invited Expert
  • Adam Argyle argyleink Google
• 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:

• I have reviewed the TAG's Web Platform Design Principles
• The group where the work on this specification is currently being done: csswg-drafts
• Major unresolved issues with or opposition to this specification: None
• This work is being funded by: Google