<video> element visual-only content has description track
This rule is not required for conformance to any accessibility requirements.
This rule checks that description tracks that come with prerecorded
<video> elements, without audio, are descriptive.
The visual information of each test target is described with a description
<track>element that has the same language as the video or the same language as the page.
- 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.
Currently the description track is not supported by most assistive technology. Video players may be able to work around the lack of support for the description track by using aria-live but few do this today.
This document includes material copied from or derived from https://act-rules.github.io/rules/ac7dc6/. Copyright © 2021 W3C® (MIT, ERCIM, Keio, Beihang).