Perceivable / 1.4 Distinguishable
1.4.7Low or No Background Audio
Level AAAFor prerecorded audio that is primarily speech -- excluding CAPTCHAs, sound logos, or musical expression -- ensure there is no background sound, that it can be turned off, or that it is at least 20dB quieter than the speech. A 20dB gap means the background is roughly a quarter as loud as the foreground.
Note
A detailed commentary for this success criterion is not yet available. In the meantime, this page lists related patterns, techniques, and links to the normative sources.
Related Techniques
Specific implementation techniques for meeting this success criterion. This site doesn't include the full text, so follow the links to the original W3C documents.
Normative References
- Success Criterion 1.4.7 Low or No Background Audio — WCAG 2.2(opens in a new tab)The normative requirement text.
- Understanding Low or No Background Audio — W3C(opens in a new tab)Official guidance on intent, examples, and techniques.