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HTTP/2 200 date: Mon, 06 Oct 2025 12:17:42 GMT content-type: text/html; charset=utf-8 content-encoding: gzip content-location: SM6.html vary: negotiate,Accept-Encoding tcn: choice last-modified: Thu, 02 Oct 2025 20:17:16 GMT cache-control: max-age=21600 expires: Mon, 06 Oct 2025 18:17:42 GMT x-backend: www-mirrors x-request-id: 98a518dcc8da755c strict-transport-security: max-age=15552000; includeSubdomains; preload content-security-policy: frame-ancestors 'self' https://cms.w3.org/ https://cms-dev.w3.org/; upgrade-insecure-requests cf-cache-status: BYPASS set-cookie: __cf_bm=M.MIGxAdy2fQ5qzd7UeVEj4GS.nS8RFMLeNaKAQ7hKA-1759753062-1.0.1.1-WIDFY_ciczteP3BLy48U98oRmT1ZkkBCLqLLgWVYAmzWUGvNZ5HYSqEXjK6vLZiSS96yhQDvM54CUOd.by3Y8Y34MRtmidV_NRQJ59m8guo; path=/; expires=Mon, 06-Oct-25 12:47:42 GMT; domain=.w3.org; HttpOnly; Secure; SameSite=None server: cloudflare cf-ray: 98a518dcc8da755c-BLR alt-svc: h3=":443"; ma=86400 SM6: Providing audio description in SMIL 1.0 | WAI | W3C

Technique SM6:Providing audio description in SMIL 1.0

About this Technique

This technique relates to:

1.2.3: Audio Description or Media Alternative (Prerecorded) (Sufficient when used with G173: Providing a version of a movie with audio descriptions)
1.2.5: Audio Description (Prerecorded) (Sufficient when used with G173: Providing a version of a movie with audio descriptions)

This technique applies whenever SMIL 1.0 player is available.

Description

The objective of this technique is to provide a way for people who are blind or otherwise have trouble seeing the video in audio-visual material to be able to access the material. With this technique a description of the video is provided via audio description that will fit into the gaps in the dialogue in the audio-visual material.

Examples

Example 1: SMIL 1.0 audio description sample for QuickTime player

<?xml version="1.0" encoding="UTF-8"?>
<smil xmlns:qt="https://www.apple.com/quicktime/resources/smilextensions" 
      xmlns="https://www.w3.org/TR/REC-smil" qt:time-slider="true">
<head>
  <layout>
    <root-layout background-color="black" height="266" width="320"/>
    <region id="videoregion" background-color="black" top="26" left="0" 
      height="144" width="320"/>
  </layout>
</head>
<body>
  <par>
    <video dur="0:01:20.00" region="videoregion" src="salesdemo.mov" 
     alt="Sales Demo"/>
    <audio dur="0:01:20.00" src="salesdemo_ad.mp3" 
     alt="Sales Demo Audio Description"/>
  </par>
</body>
</smil>

Related Resources

No endorsement implied.

Tests

Procedure

Find method for turning on audio description from content/player (unless it is always played by default)
Play file with audio description
Check whether audio description is played

Expected Results

#3 is true

Original Source | Taken Source