W3C Invites Implementations of Accessibility Conformance Testing (ACT) Rules Format 1.1

The Accessibility Guidelines Working Group has published Accessibility Conformance Testing (ACT) Rules Format 1.1 as a W3C Candidate Recommendation Snapshot. Act Rules Format defines a format for writing accessibility test rules that can be used for developing automated testing tools and manual testing methodologies. For an introduction to Accessibility Conformance Testing, see the ACT Overview. Comments are welcome via Github issues or email to public-wcag-act@w3.org by 20 October 2025.