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CSS contrast-color is newly baseline, but it falls short in some areas. Here's how it works, and what to look out for:

For folks reading into this thread, understand that APCA is not part of any W3C spec, draft or otherwise: adrianroselli.com/2026/04/wcag... You can still use APCA (whichever APCA version), but the colors you choose may not satisfy WCAG. Be sure to also check them against WCAG.

Maybe I'm misunderstanding, but are you saying that there's a risk that you might get taken to court for picking a contrasting black-vs-white colour that's better for humans, because WCAG erroneously specifies that the opposite is better?

No. Assuming I understand question. If CSS contrast-color is following the WCAG2 algorithm, then it’s going to conform. If an author chooses a color combo using *any* non-WCAG2 algorithm and that combo *fails* WCAG2 contrast, that’s the risk. That risk varies by municipality, country, etc. …