Contact emails
[email protected]

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


TAG review
No information provided


TAG review status
Not applicable


Goals for experimentation
None


Risks




Interoperability and Compatibility
No information provided

Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1396)

WebKit: No signal (https://github.com/WebKit/standards-positions/issues/657)

Web developers: No signals

Other signals:


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it 
has potentially high risk for Android WebView-based applications?
No information provided



Debuggability
No information provided


Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, 
ChromeOS, Android, and Android WebView)?
Yes


Is this feature fully tested by web-platform-tests?
Yes



Flag name on about://flags
No information provided


Finch feature name
CSSAlphaColorFunction


Rollout plan
Will ship enabled for all users


Requires code in //chrome?
False


Tracking bug
https://issues.chromium.org/issues/492246715


Estimated milestones


Shipping on desktop 150

Shipping on Android 150

Shipping on WebView 150




Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop 
issues. Please list open issues (eg links to known github issues in the project 
for the feature specification) whose resolution may introduce web 
compat/interop risk (eg, changing to naming or structure of the API in a 
non-backward-compatible way).
No information provided


Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5070160203481088?gate=6508530389614592


Links to previous Intent discussions
Intent to Prototype: 
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69b4e4d0.050a0220.b9121.0139.GAE%40google.com



This intent message was generated by Chrome Platform Status.

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