SIA-R24<video> element visual content has transcript

Accessibility requirements

This rule tests conformance of the following accessibility requirements:


This rule checks that prerecorded <video> elements have all audio and visual information available in a transcript.


This rule applies to every prerecorded <video> element that is visible where the video contains audio.


  1. The visual information of each test target is available through a text transcript that is available either on the page or through a link. That text transcript is visible and included in the accessibility tree.

A "text transcript" in the context of this rule is defined in WCAG 2 as an alternative for time based media.


This rule makes the following assumptions:

  • A mechanism is available to start the video and the video element is not simply used to display the poster.

  • The language of each test target can be correctly determined, either programmatically or by analyzing the content, and sufficiently understood.

Accessibility support

This rule has no known accessibility support concerns.



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