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Accessibility Glossary

WCAG criteria, patterns, and standards — with interactive demos, detection methods, and audit data.

New to accessibility? Start here. The foundational terms that cause the most real-world barriers — the best first read.

17 terms

A

Accessible Name Essential Robust Alternative Text Essential 54% audit fail rate 1.1.1 Perceivable

C

Color Contrast Essential 84% audit fail rate 1.4.3 Interactive Perceivable

D

Dialog / Modal Essential 65% audit fail rate UI Patterns Disproportionate Burden Essential Compliance Document Language Essential 16% audit fail rate 3.1.1 Understandable

E

Error Identification Essential 62% audit fail rate 3.3.1 Understandable

F

Focus Management Essential 65% audit fail rate Operable Focus Not Obscured Essential 2.4.11 Operable Focus Visible Essential 68% audit fail rate 2.4.7 Interactive Operable Form Input Labels Essential 49% audit fail rate 1.3.1 UI Patterns

H

Harmonised Standards Essential Compliance

I

In-Scope Services (EAA) Essential Compliance Info & Relationships Essential 60% audit fail rate 1.3.1 Perceivable

K

Keyboard Accessible Essential 78% audit fail rate 2.1.1 Operable

N

Name, Role, Value Essential 4.1.2 Robust

W

WCAG Level AA Essential WCAG Levels