Video has audio alternative
This rule checks that video elements have an alternative for information conveyed through audio
This conformance rule relates to:
The rule applies to every [non-streaming][#non-streaming-video-element]
video element that is visible, where the video contains audio.
For each test target, the outcome of at least one of the following rules is passed:
This rule assumes that the video element is used to play a video (for example, not only used to display an image), and that there is a mechanism to start the video.
There are no major accessibility support issues known for this rule.
A video element with an associated track element that contains captions for all the audio.
A video element that describes some of the text on the same page. The text on the page labels the video as an alternative.
A video element without any form of captions.
A video element that describes some of the text on the same page. The video contains more information than the text does.
A video element without that is not visible on the page.
A video element without 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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