This document discusses the work of the W3C Accessibility Conformance Testing Task Force (ACT TF) and the Auto-WCAG Community Group (CG). The ACT TF is developing a framework called ACT for writing standardized accessibility test rules. The Auto-WCAG CG is using this framework to create a repository of test rules that can be used across accessibility testing tools. The goals are to reduce differing interpretations of WCAG success criteria, make test procedures interchangeable between tools, and develop a library of commonly accepted rules.