CR Request for CSS Color Module Level 4

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Document title, URLs, estimated publication date

CSS Color Module Level 4
https://drafts.csswg.org/css-color-4/
https://www.w3.org/TR/css-color-4/
asap after transition approval

Abstract

This specification describes CSS values and properties for foreground color and group opacity.
CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, etc.

Status

https://www.w3.org/TR/css-color-4/#status
(as WD; usual CSS WG status for CR)

Link to group's decision to request transition

RESOLUTION: Color 4 to CR when timing permits
https://www.w3.org/2022/06/22-css-minutes.html#t01

Changes

https://drafts.csswg.org/css-color-4/#changes-from-20220428

Requirements satisfied

No requirements document

Dependencies met (or not)

Referenced by HTML specification (for 2D Canvas) and CSS Images 4 (for gradients)

Normative references:

• CSS Color 5, (should be informative) is a bikeshed error (mentioned in example)
• CSS Images 4 (should be informative) currently a WD
• CSS Text Decoration (should be informative) currently WD
• CSS Transitions (should be informative) currently WD
• Filter Effects (should be informative) currently WD

Wide Review

Horizontal review is complete
Several aspects of CSS Color 4 were discussed at the Color Workshop

Issues addressed

There are (currently) 4 open issues, 198 closed, and most new issues are raised by implementers.

Formal Objections

None

Implementation

It is implemented and shipped in WebKit in its entirety, and is now being implemented in Gecko and Chromium as well. It is also implemented in JavaScript libraries such as color.js, Python libraries such as Coloraide and in PostCSS

Test coverage in WPT is good (9k subtests), and the spec is fully annotated for WPT so each tested section has links to tests and test results.

Conformance to CSS Color 4 is part of Interop 2022 as Color Spaces and Functions

Patent disclosures

IPR

[svgeesus]

Normative references check but see false positives from WPT links

[swickr]

Transition approved.

The horizontal reviews were recorded quite a while ago. Please request from the horizontal review groups that they at least scan the changes since their most recent reviews and confirm they have done so before requesting CR Exit.

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Temporarily blocked on bikeshed crash

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Publication requested 29 June, expected 5 July

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Published 2022-07-05