| Rule ID |
Video 4 |
| Definition |
Live and prerecorded video with synchronized audio (i.e. a movie, lecture) using the video element must have synchronized captions. |
| Purpose |
- Synchronized captions provide a means for people who cannot hear the audio content of a video to understand the audio content of the video.
- Some types of learning disabilities affect auditory processing, captions provide an alternative way to understand the audio content of a video.
- This rule covers the requirements of both WCAG 2.0 Success Criteria 1.2.2 and 1.2.4, and therefore covers both live and prerecorded video content.
|
| Required |
Yes for HTML4 Legacy Techniques ruleset mapping |
| WCAG Success Criteria |
1.2.2 Captions (Prerecorded) (Level A, Primary Success Criterion)
Other Related Success Criterion:
|
| Rule Category |
Audio/Video |
| Scope |
Element |
| Target Resources |
video elements
|
| Techniques |
- Use the
track element to add a caption track to the video content.
- Use open captions to include the captions as part of the video.
- If closed captions are not support, use open captioning to include captions as part of the video.
- Open captioning is the only way to insure that captions are available on most cells phones and tablet computers connecting through wireless services.
|
| Manual Checks |
- When captions are enabled on the media player, verify the captions are visible.
- Verify that the captions accurately represent and are synchronized with the speech and sounds in the video.
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| Informational Links |
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