1.2.3 Audio Description or Media Alternative (Prerecorded) Level A


An alternative for time-based media or audio description of the prerecorded video content is provided for synchronized media, except when the media is a media alternative for text and is clearly labeled as such.

[View on W3C.org]

Questions & Answers

Do all videos need a transcript?

I'm working on some new blog posts and I want to include videos. Do all videos need a transcript to be accessible?

  • transcript
  • video

Do all videos need audio descriptions?

I'm going to add some videos to my website and I've heard that videos need audio descriptions. Is that true? Do all videos need audio descriptions?

  • audio descriptions
  • video

What is Time-based media?

I see that one of the web accessibility guidelines is 'Time-based Media'. What is that?

  • flashes
  • images
  • video
  • youtube