Perceivable / 1.2 Time-based Media
1.2.8Media Alternative (Prerecorded)
Level AAAProvide a full text alternative describing everything that can be seen and heard, for all prerecorded synchronized media and video-only content. Delivering it as text means it can also be read via a braille display, reaching users who are deaf-blind. Where 1.2.3 offered a media alternative as one option among others, this AAA criterion makes it mandatory.
Note
A detailed commentary for this success criterion is not yet available. In the meantime, this page lists related patterns, techniques, and links to the normative sources.
Related Techniques
Specific implementation techniques for meeting this success criterion. This site doesn't include the full text, so follow the links to the original W3C documents.
Sufficient Techniques(4)
- G58: Placing a link to the alternative for time-based media immediately next to the non-text content(opens in a new tab)waic.jp(opens in a new tab)
- G69: Providing an alternative for time based media(opens in a new tab)waic.jp(opens in a new tab)
- G159: Providing an alternative for time-based media for video-only content(opens in a new tab)waic.jp(opens in a new tab)
- H53: Using the body of the object element(opens in a new tab)waic.jp(opens in a new tab)
Normative References
- Success Criterion 1.2.8 Media Alternative (Prerecorded) — WCAG 2.2(opens in a new tab)The normative requirement text.
- Understanding Media Alternative (Prerecorded) — W3C(opens in a new tab)Official guidance on intent, examples, and techniques.