video for video only must have alternative

Rule ID Video 1
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.
Mappings
  • HTML4 Legacy Techniques (Required)
  • HTML5 and ARIA Techniques (Required)
WCAG Success Criteria

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

Other Related 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