WCAG 2.1 success criteria

All 78 WCAG 2.1 success criteria with plain-language summaries, common failure modes, and fix techniques. Maintained by the mandatiq accessibility team.

Perceivable

Information and UI components must be presentable in ways users can perceive — text alternatives, captions, contrast, adaptable layouts.

1.1.1ANon-text Content
1.2.1AAudio-only and Video-only (Prerecorded)
1.2.2ACaptions (Prerecorded)
1.2.3AAudio Description or Media Alternative (Prerecorded)
1.2.4AACaptions (Live)
1.2.5AAAudio Description (Prerecorded)
1.2.6AAASign Language (Prerecorded)
1.2.7AAAExtended Audio Description (Prerecorded)
1.2.8AAAMedia Alternative (Prerecorded)
1.2.9AAAAudio-only (Live)
1.3.1AInfo and Relationships
1.3.2AMeaningful Sequence
1.3.3ASensory Characteristics
1.3.4AAOrientation
1.3.5AAIdentify Input Purpose
1.3.6AAAIdentify Purpose
1.4.1AUse of Color
1.4.2AAudio Control
1.4.3AAContrast (Minimum)
1.4.4AAResize Text
1.4.5AAImages of Text
1.4.6AAAContrast (Enhanced)
1.4.7AAALow or No Background Audio
1.4.8AAAVisual Presentation
1.4.9AAAImages of Text (No Exception)
1.4.10AAReflow
1.4.11AANon-text Contrast
1.4.12AAText Spacing
1.4.13AAContent on Hover or Focus

Operable

All UI components and navigation must be operable — keyboard support, enough time, no seizure-inducing motion, navigability, and input modalities.

Understandable

Information and UI operation must be understandable — readable text, predictable behaviour, helpful input assistance.

3.1.1ALanguage of Page
3.1.2AALanguage of Parts
3.1.3AAAUnusual Words
3.1.4AAAAbbreviations
3.1.5AAAReading Level
3.1.6AAAPronunciation
3.2.1AOn Focus
3.2.2AOn Input
3.2.3AAConsistent Navigation
3.2.4AAConsistent Identification
3.2.5AAAChange on Request
3.3.1AError Identification
3.3.2ALabels or Instructions
3.3.3AAError Suggestion
3.3.4AAError Prevention (Legal, Financial, Data)
3.3.5AAAHelp
3.3.6AAAError Prevention (All)

Robust

Content must be robust enough to be interpreted by a wide variety of user agents, including assistive technologies.