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Adrian Roselli
@aardrian.bsky.social

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.

adrianroselli.comWCAG3 Contrast as of April 2026I am not speaking on behalf of the W3C nor the W3C Accessibility Guidelines Working Group (AGWG), nor am I a member, nor does anyone who is member know I am writing this, nor do I have any insider knowledge. For years I have seen people, teams, products, organizations, and…
Jake Archibald
@jakearchibald.com

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?

Adrian Roselli
@aardrian.bsky.social

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. …