Techniques for WCAG 2.0

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# G166: Providing audio that describes the important video content and describing it as such

## Applicability

All technologies that can contain video content

This technique relates to:

- Success Criterion 1.2.1 (Audio-only and Video-only (Prerecorded))
  - How to Meet 1.2.1 (Audio-only and Video-only (Prerecorded))
  - Understanding Success Criterion 1.2.1 (Audio-only and Video-only (Prerecorded))

## Description

Video-only content is inaccessible to people who are blind and to some who have low vision. Therefore, it is important for them to have an audio alternative. One way of doing this is to provide an audio track describing the information in the video. The audio should be a common audio format used on the internet, such as MP3.

## Examples

### Example 1

A Web page has a link to a video-only presentation of a spaceship landing on Mars. The link to the video is a picture of a spaceship. Near the video is a link to an audio file of a person describing the video. This would look something like the following code example in HTML.

Example Code:

    <a href="../video/marslanding.mp4"><img src="../images/spaceship.jpg"
       alt="Mars landing, video-only" width="193" height="255"/></a>
    <br />
    <a href="Mars_landing_audio.mp3">Audio description of "Mars Landing"</a>

## Related Techniques

- G159: Providing an alternative for time-based media for video-only content

## Tests

### Procedure

For a Web page that contains video-only content:

1. Check that there is link to an audio alternative immediately before or after the video-only content.

### Expected Results

- Check #1 is true.

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