Video only element has description track
This rule checks that description tracks that come with non-streaming
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.
Note: Multiple description
track elements may be useful for different languages, but at least one must match the language of the video or the language of 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.
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 discription track by using aria-live but few do this today.
A video only element with a track element that contains descriptions.
A video only element with a track element that contains incorrect descriptions.
A video only element without a track element.
A video only element that is not visible on the page.
A video element with audio.
Content perceivable through sight.
Content is considered visible if making it fully transparent would result in a difference in the pixels rendered for any part of the document that is currently within the viewport or can be brought into the viewport via scrolling.
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