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Give your audio a text equivalent. This is text which shares the same information as the video, without important content being lost. Transcripts and captions are examples of a text equivalent.
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If possible, provide the option of word highlight in the text equivalent.
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Provide volume controls.
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Provide visual equivalents to audio alerts.
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Provide alternatives for time-based media.
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Avoid automatic playing of audio or video.
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Provide keyboard-accessible fast forward, rewind and pause functions.
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Give the user the possibility of inserting bookmarks.