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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onloadedmetadata — duration</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:320px;margin-bottom:.75rem}#metaOut{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <h1>Metadata → duration</h1>

  <p>Duration appears when loadedmetadata fires.</p>

  <audio controls onloadedmetadata=handleMetadataLoaded(this)>

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

    Your browser does not support the audio element.

  </audio>

  <p id=metaOut>Waiting for metadata…</p>



  <script>function handleMetadataLoaded(t){isFinite(t.duration)&&(document.getElementById("metaOut").textContent="Duration: "+t.duration.toFixed(1)+" seconds",document.getElementById("metaOut").style.background="#f0fdf4",document.getElementById("metaOut").style.borderColor="#bbf7d0")}</script>

</body>

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HTML onloadedmetadata Attribute — Show duration