Accessibility Conformance Testing

A W3C technical recommendation that defines a standardized format for writing rules to test web accessibility. The ACT Rules Format provides a consistent structure for describing what to test and what outcomes to expect, aiming to reduce inconsistency between different automated accessibility evaluation tools. Each ACT Rule includes an applicability section (which elements on a page the rule applies to), expectations (what conditions must be met), and mappings to specific WCAG success criteria. Rules come in two types: atomic rules that define a single testable requirement, and composite rules that combine multiple atomic rules. A community-maintained set of ACT Rules is publicly available and used by tool developers to harmonize their implementations.