What This Rule Checks
For users who rely on assistive technologies such as screen readers, audio that plays automatically can disrupt their experience by interfering with the speech output from their screen readers. Users with cognitive impairments or those sensitive to unexpected sounds can also be negatively affected by audio that starts without their consent. Ensuring that audio doesn’t autoplay, or providing a mechanism to stop or control the audio, allows users to navigate your site without frustration.
Who Is Affected
This issue primarily affects: Blind users, who rely entirely on screen readers or braille displays to navigate and interact with content; Deafblind users, who rely on braille displays and cannot access visual or auditory content; Cognitive users, who benefit from clear structure, simple language, and consistent navigation patterns.
Why This Matters
Auto-playing audio interferes with screen reader speech output, forcing users to locate and silence the media before they can navigate the page. Users with cognitive disabilities may find unexpected audio disorienting or distressing.
How to Fix
To fix this issue, ensure that audio doesn’t automatically play when the page loads, or at the very least, provide users with a control to pause, stop, or mute the audio.
Code Examples
<!-- Auto-playing video with sound, no controls -->
<video autoplay src="promo.mp4"></video>
<!-- Auto-playing audio -->
<audio autoplay src="background-music.mp3"></audio>
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<!-- User-initiated playback with controls -->
<video src="promo.mp4" controls></video>
<!-- If autoplay needed, mute by default -->
<video
autoplay
muted
src="hero-video.mp4"
controls>
</video>
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Common Mistakes to Avoid
- Auto-playing audio that lasts more than 3 seconds without pause/stop controls.
- Using background music or ambient audio without a mute mechanism.
- Auto-playing videos that unmute on hover or scroll.
Tip: Multimedia content must be accessible to users who cannot see or hear. Provide captions for video, transcripts for audio, and text descriptions for visual-only content. Always include user-controllable playback.
Related WCAG Criteria
- 1.4.2: Audio Control