All WCAG criteria
WCAG 2.1·Perceivable·1.4 Distinguishable

1.4.2 Audio Control

Level A

Audio that plays automatically for more than 3 seconds must have a way to pause or stop it.

Why it matters

Auto-playing audio interferes with screen readers and is disorienting for many users.

Common failure
<audio src="/bg.mp3" autoplay loop></audio>
Accessible version
<audio src="/bg.mp3" controls></audio>

How OnlyEnable handles this

Automatically remediated. OnlyEnable's "Mute Sounds" profile silences all media playback site-wide.

Related criteria in 1.4 Distinguishable