Adrian Roselli, pH0APCA is no longer part of WCAG3. You can still use it, but for conformance (legal, policy, etc.) reasons you will still need to follow WCAG2. It’s possible to satisfy both in most cases.
Lots of questions about this. Notes:
• I’m NOT a member of working group;
• Went away in January 2023: https://github.com/w3c/silver/pull/663#issuecomment-1408914402
• Disappeared in July 2023 WCAG3 working draft: https://www.w3.org/TR/2023/WD-wcag-3.0-20230724/#color-and-contrast
• APCA was only ever exploratory, and July 2023 update explained removals: https://web.archive.org/web/20230726204602/https://www.w3.org/WAI/standards-guidelines/wcag/wcag3-intro/#status-exploratory-draft
• Anybody promoting it since then (or, frankly, before, and especially now) failed to do due diligence. It was only ever draft, always temporary.
Inclusive Reading TechnologiesAPCA is part of the APCA Readability Criterion, an open standard available from Inclusive Reading Technologies, Inc. A California non-profit, dedicated to science-based standards and research to improve readability for all.
