Success Criterion 1.2.3
Conformance level A

Audio Description Track With No Way to Turn It On

1.2.3 — Audio Description or Media Alternative (Prerecorded)

Scenario

Setting

A language-learning app's lesson screen

What’s wrong

audio description track exists but the player provides no way to select it.

Example

<video src="walkthrough.mp4"></video>

Why it matters

Blind and low-vision viewers who hear dialogue but miss unique visual information.

How to test

Check the player controls for an audio-description toggle: if it exists but doesn't actually switch on a described audio track, it fails.

How to fix

An audio description or a full descriptive transcript covering all important visual information must be provided.

<video src="walkthrough.mp4">

  <track kind="descriptions" src="desc-en.vtt" srclang="en">

</video>

<a href="walkthrough-transcript.html">Full text alternative</a>

A descriptions track or full transcript covers on-screen information dialogue never mentions.

Outcome

On a language-learning app's lesson screen, this barrier is gone for blind and low-vision viewers who hear dialogue but miss unique visual information — they get the same result as anyone else here.

Who is affected