Audio Description
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WCAG 1.2.1: Audio-only and Video-only (Prerecorded)
WCAG 1.2.1 requires that prerecorded audio-only and video-only content have a text-based or media alternative so users who cannot hear or see the media can still access the information. This is a Level A requirement, meaning it is the minimum baseline for web accessibility compliance.
WCAG 1.2.3: Audio Description or Media Alternative (Prerecorded)
WCAG 1.2.3 requires that prerecorded synchronized media (video with audio) provides either an audio description of the visual content or a full text alternative, ensuring users who are blind or have low vision can access information conveyed visually.
WCAG 1.2.7: Extended Audio Description (Prerecorded)
WCAG 1.2.7 requires that when pauses in foreground audio are insufficient to convey all visual information, extended audio descriptions—achieved by pausing the video—must be provided for prerecorded synchronized media. This ensures blind and low-vision users can fully understand complex visual content that standard audio descriptions cannot cover.