Understanding Success Criterion 1.2.1: Audio and Video-only (Prerecorded)

Understanding Success Criterion 2.4.1 Bypass Blocks (1)

Success Criterion 1.2.1 Audio-only and Video-only (Prerecorded) (Level A): For prerecorded audio-only and prerecorded video-only media, the following are true, except when the audio or video is a media alternative for text and is clearly labelled as such:

Official Requirements

Prerecorded Audio-only

An alternative for time-based media is provided that presents equivalent information for prerecorded audio-only content.

Prerecorded Video-only

Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.

Why is it required?

It is difficult for people with disabilities to perceive audio or video-only (prerecorded) media without any text or audio alternatives.

Are there any exceptions?

An audio track provided as an alternative to understand the video does not require a text transcript.

Mistakes to avoid

Lastly, we have listed out the common mistakes committed by websites

  1. Audio-only media not having a text transcript
  2. The text transcript does not convey the same information as audio or video-only media
  3. The text transcript is missing descriptions of important sound effects in video/audio-only media
  4. The text transcript is missing descriptions of key visual information in the video-only media


Understanding Success Criterion 1.2.1: Audio-only and Video-only (Prerecorded)

Picture of Aditya Bikkani

Aditya Bikkani

Aditya is the COO of AELData, a growing technology company in the Digital Publishing and Education sectors. He is also an entrepreneur and founder of an accessibility tool called LERA. A W3C COGA (Cognitive and Learning Disabilities Accessibility) Community Member Aditya contributes to researching methodologies to improve web accessibility and usability for people with cognitive and learning disabilities.

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