<video> element visual-only content has accessible alternative
This rule tests conformance of the following accessibility requirements:
This rule checks that
<video> elements without audio have an alternative available.
- For each test target, the outcome of at least one of the following rules is passed:
<video>element visual-only content is media alternative for text
<video>element visual-only content has description track
<video>element visual-only content has transcript
<video>element visual-only content has audio track alternative
- 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 technologies. 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/c3232f/. Copyright © 2021 W3C® (MIT, ERCIM, Keio, Beihang).