[csswg-drafts] [css-conditional-5] Should `revert-*` evaluate to `unknown` instead of `false` in a style query? (#12424)

cdoublev has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-conditional-5] Should `revert-*` evaluate to `unknown` instead of `false` in a style query? ==
https://drafts.csswg.org/css-conditional-5/#style-container

  > Cascade-dependent keywords, such as `revert` and `revert-layer`, are invalid as values in a style feature, **and cause the container style query to be false**.

But my understanding is that if it is *invalid*, the corresponding input `<style-in-parens>` matches `<general-enclosed>` and evaluates to `unknown`, which is intended for an invalid feature name or value, or when any other part of the input does not match the syntax of the query/feature.

Do you want `not style(--custom: revert)` to evaluate to `true` like in Chrome, or `false`, which requires evaluating it to `unknown`?

Based on the comments in #7080, I suspect `unknown` is expected:

  > I mean that `style(left: revert[-layer])` should be a parse error or "unknown" or something like that.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/12424 using your GitHub account


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Received on Tuesday, 1 July 2025 05:33:07 UTC