45 lines
2.1 KiB
Markdown
45 lines
2.1 KiB
Markdown
[Back to 1 Perceivable index](index.md)
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# 1.2.1 Audio-only and Video-only (Prerecorded)
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- Level: A
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- Guideline: 1.2 Time-based Media
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- Principle: 1 Perceivable
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## What it is
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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 labeled as such:
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- **Prerecorded Audio-only:** An alternative for time-based media is provided that presents equivalent information for prerecorded audio-only content.
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- **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.
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## How to test
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- Check: An alternative for time-based media is provided that presents equivalent information for prerecorded audio-only content.
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- Check: Either an alternative for time-based media or an audio track is provided that presents equivalent information for prerecorded video-only content.
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- Use the sufficient techniques below as acceptable methods when applicable.
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- Confirm none of the common failures apply.
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## Sufficient techniques (W3C)
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- G158: Providing an alternative for time-based media for audio-only content
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- G159: Providing an alternative for time-based media for video-only content
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- G166: Providing audio that describes the important video content and describing it as such
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## Advisory techniques (W3C)
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- H96: Using the track element to provide audio descriptions
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## Common failures (W3C)
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- F30: Failure of Success Criterion 1.1.1 and 1.2.1 due to using text alternatives that are not alternatives (e.g., filenames or placeholder text)
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- F67: Failure of Success Criterion 1.1.1 and 1.2.1 due to providing long descriptions for non-text content that does not serve the same purpose or does not present the same information
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## Resources
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- WCAG 2.2 SC: https://www.w3.org/TR/WCAG22/#audio-only-and-video-only-prerecorded
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- Understanding: https://www.w3.org/WAI/WCAG22/Understanding/audio-only-and-video-only-prerecorded.html
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- Quick reference: https://www.w3.org/WAI/WCAG22/quickref/?versions=2.2#audio-only-and-video-only-prerecorded
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[Back to 1 Perceivable index](index.md)
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