SIA-R25<video> element visual content has audio description
Accessibility requirements
This rule is not required for conformance to any accessibility requirements.
Description
This rule checks that prerecorded <video> elements have all visual information also contained in the audio.
Applicability
This rule applies to every prerecorded <video> element that is visible where the video contains audio.
Expectations
- The visual information of each test target is available through its audio, or through an audio description track.
Assumptions
- This rule assumes that a mechanism is available to start the video and that the video element is not simply used to display the poster.
- This rule assumes that the language of each test target can be correctly determined (either programmatically or by analyzing the content), and sufficiently understood.
Accessibility support
There are only a few implementations of video players (without third party technologies) that support audio description tracks at the time of writing.
Examples
Acknowledgments
This document includes material copied from or derived from https://www.w3.org/WAI/standards-guidelines/act/rules/1ea59c/. Copyright © 2024 W3C® (MIT, ERCIM, Keio, Beihang).