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For videos that are pre-recorded, provide audio description of what happens on screen, even if you’ve already provided a text description.
Video content (like instructional videos, ads or interviews) must have audio description.
This ensures that information communicated visually in the video is available to people who cannot see it.
See the W3C’s detailed explanation of this guideline with techniques and examples.
Note: pre-recorded videos without sound are covered somewhere else in the W3C Web Content Accessibility Guidelines:
1.2.1 Audio-only and Video-only (Prerecorded): For prerecorded audio-only and prerecorded video-only media, the following are true, except when the audio or video is a media alternative for text and is clearly labeled as such: (Level A)
- Prerecorded Audio-only: An alternative for time-based media is provided that presents equivalent information for prerecorded audio-only content.
- Prerecorded Video-only: Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.