video must have caption

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.
  • 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)

Rule Category Audio/Video
Scope Element
Target Resources video elements
  • track
  • video
  • 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.
Informational Links