Accessibility Conformance Level

Accessibility conformance levels are the tiered ratings defined by the Web Content Accessibility Guidelines (WCAG) to indicate the degree to which web content meets accessibility success criteria. WCAG defines three levels: Level A (minimum, addressing the most critical barriers), Level AA (the standard target for most legal requirements and organizational policies), and Level AAA (the highest level, addressing the widest range of accessibility needs). Each level is cumulative — Level AA requires meeting all Level A and Level AA success criteria. Conformance is binary at each level: a page either meets all criteria at that level or it does not conform. This all-or-nothing approach has been criticized for lacking granularity, since a page failing one criterion receives the same non-conformant rating as a page failing many, leading researchers to develop quantitative metrics that provide more nuanced accessibility measurement.