The Accessibility Guidelines Working Group (AG WG) has published Accessibility Conformance Testing (ACT) Rules Format 1.0 as a W3C Proposed Recommendation. This draft demonstrates implementations of the specification based on example ACT Rules being continuously developed by the ACT Rules Community Group. A blog post Harmonized Accessibility Testing provides more background on this work.
Comments are welcome through 24 September 2019. Read about the the W3C Web Accessibility Initiative (WAI).