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:

Prerecorded Audio-only: An alternative for time-based media is provided that presents equivalent information for prerecorded audio-only content.

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.

Testing & Remediation

How to test: Identify any audio-only (eg audio recordings) or video-only (eg educational animations, silent movies) and ensure there is a text alternative/transcript. For audio-only content:
  1. View the audio-only content while referring to the alternative for time-based media.
  2. Check that the dialogue in the transcript matches the dialogue and information presented in the audio-only presentation.
  3. If the audio includes multiple voices, check that the transcript identifies who is speaking for all dialogue.
  4. Check that at least one of the following is true:
    1. The transcript itself can be programmatically determined from the text alternative for the audio-only content
    2. The transcript is referred to from the programmatically determined text alternative for the audio-only content
  5. If the alternate version(s) are on a separate page, check for the availability of link(s) to allow the user to get to the other versions.
How to remediate:
  • If the content is prerecorded audio-only:
    • Provide a transcript of the audio, including identification of who is speaking, as well as other significant sounds that are part of the recording (applause, laughter, etc)
  • If the content is prerecorded video-only:
    • Provide an alternative audio track that describes the content being shown in the video.

Questions and Answers

What is Time-based media?

Time-based media is content that must be made accessible when held against criterion 1.2 of the WCAG 2.0 guidelines found here: Content is considered time-based media if it's:
  • Audio-only
  • Video-only
  • A combination audio/video
  • Audio and or video combined with an interaction.
This terminology encompasses a broad number of third-party software platforms and content libraries, such as:
  • YouTube
  • Video.js
  • SoundCloud
  • Spotify
Put broadly, time-based media is anything that's embedded on a website that: moves, makes noise, displays content synchronized with another element of the site, or displays content that changes without user input. Certain accessibility considerations need to be made when building content so that everyone has access to content regardless of their level of ability.

How long does the accessibliity process take?

This question depends on a number of factors including size of site, desired level of conformance, your developer's understanding of accessibility techniques, etc. Accessible Web is here to help. Reach out and we can discuss your site specifically.