<audio>

By Dan Gold

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<p>Sound description: one short, steady tone.</p>
<audio controls preload="metadata" aria-label="A short demonstration tone"><source 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type="audio/wav">Audio playback is unavailable.</source></audio>

<p>Sound description: one short, steady tone.</p>
<audio controls preload="metadata" aria-label="A short demonstration tone"><source 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type="audio/wav">Audio playback is unavailable.</source></audio>

CSS

audio {
  max-width: 100%;
}

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Sources and loading

Use audio’s src, or nested source elements with src and an optional accurate type hint. srcset, sizes, width, and height are image-source concepts, not a responsive-audio recipe.

preload is a hint with none, metadata, or auto; its default is browser-dependent. autoplay is subject to browser permission and user policy, so its presence does not guarantee playback. muted and loop are Boolean attributes.

Accessible alternatives

Provide a transcript for speech and describe meaningful sounds. Native audio controls do not display WebVTT captions like a video surface; audio-only content can use a video player when visible synchronized captions are needed. Test the chosen delivery method.

Child fallback text addresses browsers that do not support audio, not every download or codec failure. Put essential descriptions and an alternative link outside the player. In a real project, serve a small optimized audio file rather than embedding large recordings in HTML.

Sources and browser support

MDN: audio describes the syntax and links to the specification and compatibility data. Check individual values in that table when supporting older browsers.