Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Checkpoint(also: WCAG Checkpoint, Success Criterion, Accessibility Checkpoint)
- A checkpoint is a specific, testable accessibility requirement in a set of guidelines — for example, 'provide a text equivalent for every non-text element' is WCAG 1.0 checkpoint 1.1. The term is strongly associated with WCAG 1.0, which was organised into 65 numbered checkpoints…
- Conformance Level(also: WCAG Level, Priority Level)
- The three-tiered classification system used by WCAG to rank success criteria by their importance and impact on accessibility. Level A represents the minimum baseline — criteria that must be met or some users will be completely unable to access content. Level AA addresses the…
- Contrast Ratio(also: Color Contrast Ratio, Luminance Contrast Ratio)
- A numerical measure of the difference in perceived brightness between two colors, expressed as a ratio ranging from 1:1 (no contrast) to 21:1 (maximum contrast, black on white). WCAG 2.2 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (Level…
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