|Live and prerecorded video with synchronized audio (i.e. a movie, lecture) using the
object element must have synchronized captions.
- Synchronized captions provide a means for people who cannot hear the audio content of a video to have access to the speech and sounds of the video.
- Some types of learning disabilities effect 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 content.
HTML4 Legacy Techniques
HTML5 and ARIA Techniques
|WCAG Success Criteria
1.2.2 Captions (Prerecorded) (Level A, Primary Success Criterion)
- Consider using the
video element instead of the
object element for video containing synchronized audio. The
video element has better support for adding caption tracks.
- Use video authoring tools and player technologies that support captioning. Use the features of the authoring system and player to add open or closed captions to 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.
- 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.