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Success Criterion · WCAG 1.2.4

Captions (Live)

Captions are provided for all live audio content in synchronized media.

Level AAWCAG 2.0Perceivable1.2 · Time-based Media
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Success criterion

What WCAG 1.2.4 requires

Summarized directly from the official Understanding document so teams can quote the requirement accurately.

All non-text content that is presented to users must expose an equivalent text-based alternative unless a documented exception applies.

View Understanding 1.2.4Open QuickRef techniques

Fast facts

Conformance level
Level AA
WCAG version introduced
WCAG 2.0
Principle
Perceivable
Guideline
1.2 · Time-based Media

Implementation checklist

Capture progress and blockers

  • Document how this criterion impacts your product and note any exceptions.
  • Describe the user experience goal in plain language for designers and engineers.
  • List the components, templates, or workflows that must meet this requirement.
  • Capture manual and automated testing steps for future audits.

Testing ideas

Prove conformance with evidence

  • Pair automated linting with human review to verify visual, auditory, or temporal aspects.
  • Use assistive technology walkthroughs (screen reader, keyboard, switch, voice) to validate behavior.
  • Capture screenshots or recordings that demonstrate pass/fail conditions.

Related success criteria

More from Time-based Media (1.2)

View all criteria
WCAG 1.2.1Audio-only and Video-only (Prerecorded)Level AWCAG 1.2.2Captions (Prerecorded)Level AWCAG 1.2.3Audio Description or Media Alternative (Prerecorded)Level AWCAG 1.2.5Audio Description (Prerecorded)Level AAWCAG 1.2.6Sign Language (Prerecorded)Level AAAWCAG 1.2.7Extended Audio Description (Prerecorded)Level AAAWCAG 1.2.8Media Alternative (Prerecorded)Level AAAWCAG 1.2.9Audio-only (Live)Level AAA
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