WCAG 1.0 Level A Checkpoint 1.3

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“Until user agents can automatically read aloud the text equivalent of a visual track, provide an auditory description of the important information of the visual track of a multimedia presentation.”

This is complementary to 1194.22 sub-paragraph (b) (WCAG Checkpoint 1.4). Checkpoint 1.3 requires, for multimedia presentations, an audio equivalent of important visual content such as text and descriptions of action.

Checkpoint 1.4 requires that equivalent alternative content (like text or audio descriptions) be synchronized to time-based multimedia presentations (like video or Flash).

Reference

WCAG 1.0: Visual Information and Motion