WCAG 1.2.1
Level A
Perceivable
1.2.1 Audio-only and Video-only (Prerecorded)
Prerecorded audio-only and video-only content has a text or audio alternative.
What 1.2.1 Audio-only and Video-only (Prerecorded) means
A podcast needs a transcript; a silent video needs a text or audio description of what it shows.
How to test
Confirm audio-only files have transcripts and video-only files have equivalent text or audio descriptions.
How to meet it
Publish a full transcript for audio; add an audio track or text description for silent video.
Need help meeting 1.2.1?
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Official reference: Understanding 1.2.1 Audio-only and Video-only (Prerecorded) (W3C)
More Perceivable criteria
1.1.1 Non-text Content
1.2.2 Captions (Prerecorded)
1.2.3 Audio Description or Media Alternative (Prerecorded)
1.2.4 Captions (Live)
1.2.5 Audio Description (Prerecorded)
1.3.1 Info and Relationships
1.3.2 Meaningful Sequence
1.3.3 Sensory Characteristics
1.3.4 Orientation
1.3.5 Identify Input Purpose
1.4.1 Use of Color
1.4.2 Audio Control
1.4.3 Contrast (Minimum)
1.4.4 Resize Text
1.4.5 Images of Text
1.4.10 Reflow
1.4.11 Non-text Contrast
1.4.12 Text Spacing
1.4.13 Content on Hover or Focus