[csswg-drafts] [css-conditional-5] Style and media ranges are inconsistent (#12425)

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

== [css-conditional-5] Style and media ranges are inconsistent ==
They accept different range values:

  - [media](https://drafts.csswg.org/mediaqueries-5/#typedef-mf-range): `<number>`, `<dimension>`, `<ratio>`
  - [style](https://drafts.csswg.org/css-conditional-5/#typedef-style-range): `<number>`, `<percentage>`, `<length>`, `<angle>`, `<time>`, `<frequency>`, `<resolution>`

There is probably a reason to restrict dimension types for style range values. But I suspect that `<flex>` and `<ratio>` should be valid. 

(No media feature values accept `<percentage>` so this difference may be normal, but I wonder if it should be valid for future compat with a media feature value accepting a raw percentage, to make its query evaluate to `unknown`... which is off topic.)

Style range values are actually defined with `<declaration-value>` and validated against the above numeric types at evaluation time. If this validation fails, it evaluates to `false`. If I am not mistaken, a consequence is that `not style(1px < 1unknown)` evaluates to `true` instead of `unknown`, which becomes `false` at the top-level, like for `not media(width < 1unknown)`. (This assumes that `media()` - and other functional conditions - are always used in a context accepting `<general-enclosed>` as a fallback.)

So I just want to make sure that these differences are not an oversight.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/12425 using your GitHub account


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Received on Tuesday, 1 July 2025 05:42:12 UTC