[csswg-drafts] [css-color-4] Clarify how to resolve `<system-color>` (#13719)

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

== [css-color-4] Clarify how to resolve `<system-color>` ==
  > To maintain legibility, the `<system-color>` keywords also respond to light mode or dark mode changes.

This [statement](https://drafts.csswg.org/css-color-4/#css-system-colors) is not backed by any defined requirement. I think it should rather be a recommendation for the UAs:

  > To maintain legicility, the UA *should* adapt the resolved value of `<system-color>` keywords to light mode or dark mode changes.

But *light mode or dark mode changes* seems restrictive. I think UAs should adapt to the [*used color scheme*](https://drafts.csswg.org/css-color-adjust-1/#determine-the-used-color-scheme) instead.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/13719 using your GitHub account


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Received on Wednesday, 25 March 2026 06:53:20 UTC