video only has audio alternative
video elements without audio must have an audio alternative
The visual information of each test target is available through an audio track.
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.
There are no major accessibility support issues known for this rule.
A video element without audio has a separate audio track that describes the visual information.
A video element without an audio track.
A video element without audio has a separate audio track that incorrectly describes the visual information.
A video element with audio.
A video element without sound that is not visible on the page.
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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