video elements must have a track for captions
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<video> element must include a <track> element with
kind="captions" set as a property. The captions should convey all meaningful auditory information in the video including dialogue, musical cues, sound effects, and other relevant information for deaf users.
The Algorithm, in Simple Terms
Ensures that the HTML5
<video> element is captioned.
Why this is Important
If a video has no caption, deaf users will have limited access to the information contained in it. Even if a captions track is available, ensure that it contains all the information necessary to understand the video, and not just dialogue.
How to Fix the Problem
<video> elements have a caption using the
<track> element with caption attribute. Ensure the caption conveys all meaningful information in the
<video> element; this includes, but is not limited to, dialogue, musical cues, and sound effects.