WCAG 1.4.2
Level A
Perceivable
1.4.2 Audio Control
Audio that plays automatically for more than 3 seconds can be paused, stopped, or muted.
What 1.4.2 Audio Control means
Auto-playing sound does not interfere with screen-reader speech.
How to test
Check any auto-playing audio has an accessible pause/stop/volume control.
How to meet it
Avoid autoplay, or provide an obvious, keyboard-accessible control to stop or mute it.
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Official reference: Understanding 1.4.2 Audio Control (W3C)
More Perceivable criteria
1.1.1 Non-text Content
1.2.1 Audio-only and Video-only (Prerecorded)
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
1.4.3 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