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Applicability
This rule applies to every non-streaming video element that is visible where the video contains audio.
Expectation
For each test target, audio information that is not conveyed visually in the video, is available through captions.
Note: Captions can be either embedded in the video file itself or can be made available trough a separate track.
Assumptions
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.