An alternative for time-based media or audio description of the prerecorded video content is provided for synchronized media, except when the media is a media alternative for text and is clearly labeled as such.

Testing & Remediation

How to test: For all video media on your site, ensure that there is either:
  • An audio description of the video content
  • Text form of synchronized media (visual & auditory)
How to remediate: There are a number of techniques to add an alternative for time based media. Please view the W3C link above for details about the techniques that are sufficient for remediating issues related to this success criteria.

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: https://www.w3.org/TR/UNDERSTANDING-WCAG20/media-equiv.html 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.