Intent to Prototype: named-feature() function for CSS @supports

[David Baron]

Contact emails

dba...@chromium.org

Explainer

https://github.com/w3c/csswg-drafts/blob/main/css-conditional-5/named-feature-explainer.md

Specification

https://drafts.csswg.org/css-conditional-5/#typedef-supports-named-feature-fn

Summary

The named-feature() function allows CSS @supports rules to query for a small set of specific named features that are not possible to test for using other @supports mechanisms but which are considered highly valuable to test for.

Blink component

Blink>CSS

Web Feature ID

Missing feature

Motivation

Sometimes we add new features to CSS where two things are simultaneously true: first, that CSS authors see high value in writing conditional styles for whether the feature is supported using @supports, and second, that the existing mechanisms in @supports don't provide a useful way to test for the feature. This provides a way for us to give names to a small number of high-value features so that CSS authors can test for them in their style sheets.

Initial public proposal

https://github.com/w3c/csswg-drafts/issues/3559#issuecomment-1868169502

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/353715317

Estimated milestones

No milestones specified

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5153932394102784?gate=5078781807820800

This intent message was generated by Chrome Platform Status.