Intent to Prototype: Relative Alpha Colors (CSS Color 5 alpha() function)

[Chromestatus]

Contact emails

cg...@chromium.org

Specification

https://drafts.csswg.org/css-color-5/#relative-alpha

Summary

Relative alpha colors refer to an origin color, and only change the alpha channel. The meaning of alpha channels is defined in CSS Color 4 § 4.2 Representing Transparency in Colors: the <alpha-value> syntax.

Blink component

Blink>CSS

Web Feature ID

Missing feature

Motivation

Relative alpha colors provide a direct CSS way to derive a translucent version of an existing color without rewriting its color channels. Authors currently need to duplicate component values or create separate precomputed tokens when they want “the same color, different opacity.” The CSS Color 5 alpha() function preserves the original color components and only changes alpha, which reduces authoring overhead and makes color tokens easier to reuse and maintain.

Initial public proposal

No information provided

Goals for experimentation

None

Requires code in //chrome?

False

Estimated milestones

No milestones specified

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5070160203481088?gate=5172416059932672

This intent message was generated by Chrome Platform Status.