| Rule ID |
Video 9 |
| Definition |
embed elements used for prerecorded video with synchronized audio (i.e. a movie, archived lecture) must have audio description of the video content. |
| Purpose |
- Text and audio descriptions provide a means for people who cannot see the video to understand the video content.
- Some types of learning disabilities affect visual processing, text and audio descriptions provide an alternative way to understand the video content.
- This rule covers the requirements of both WCAG 2.0 Success Criteria 1.2.3 and 1.2.5, that is why a text description of the video content cannot be used to satisfy this rule.
|
| Mappings |
-
HTML4 Legacy Techniques
(Required)
-
HTML5 and ARIA Techniques
(Required)
|
| WCAG Success Criteria |
1.2.3 Audio Description or Media Alternative (Prerecorded) (Level A, Primary Success Criterion)
Other Related Success Criterion:
|
| Rule Category |
Audio/Video |
| Scope |
Element |
| Target Resources |
embed elements
|
| Techniques |
- Use the
video element instead of the embed element for video only content, since the video element provides better support for audio description tracks.
- Include an audio track in the video that describes the video content.
- Use
aria-describedby attribute to point to a text description of the video only content.
|
| Manual Checks |
- When audio descriptions are enabled on the media player, check to make sure the audio description can be heard.
- If there is a audio description make sure the description accurately describes the video content.
- If there is a text description make sure the description accurately describes the video content.
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| Informational Links |
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