video for video only must have alternative

Definition video elements used for prerecorded video only content must have text or 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.
Required Yes for HTML4 Legacy Techniques ruleset mapping
WCAG 2.0 Success Criteria

1.2.1 Audio-only and Video-only (Prerecorded) (Level A, Primary Success Criterion)

Rule Category Audio/Video
Scope Element
Target Resources video elements
  • track
  • video
Techniques
  • Use the track element to add audio descriptions to the video content.
  • Use aria-describedby to reference a text description of the video content.
  • Include an audio sound track that describes the video 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.
Informational Links