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  <title>ondurationchange — inline on audio</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}audio{display:block;max-width:100%;margin-bottom:.75rem}.status{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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  <h1>ondurationchange on audio</h1>

  <p>When metadata loads, <code>durationchange</code> fires and <code>element.duration</code> becomes a number in seconds.</p>

  <audio controls ondurationchange=handleDurationChange(this)>

    <source src=/audio/count.mp3 type=audio/mpeg>

    Your browser does not support audio.

  </audio>

  <div class=status id=status>Duration: unknown (waiting for metadata…)</div>



  <script>function handleDurationChange(n){var t=Math.floor(n.duration);document.getElementById("status").innerHTML="<strong>durationchange fired!</strong> Total length: "+t+" seconds."}</script>

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HTML ondurationchange Attribute — Inline Handler on audio