An alternative for time-based media is provided for all prerecorded synchronized media and for all prerecorded video-only media.
Checklist – Components
Video – Recordings
WCAG 1.2.3, 1.2.5, and 1.2.8 overlap, so that you can chose the minimum conformance level for your situation. In other words…
- If you want to comply at the A level, use 1.2.3 Audio Description or Media Alternative (Prerecorded) – Level A, and choose between an audio description or a full-text alternative.
- If you want to comply at the AA level, use 1.2.5 Audio Description (Prerecorded) – Level AA, which requires the audio description track.
- If you want to comply at the AAA level, use 1.2.8 Media Alternative (Prerecorded) – Level AAA, which requires both the audio description and the full-text alternative.