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  <meta charset=UTF-8>

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

  <title>ondurationchange — dynamic assignment</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}video{display:block;max-width:100%;width:320px;border-radius:8px;background:#0f172a;margin-bottom:.75rem}.log{padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

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<body>

  <h1>video.ondurationchange</h1>

  <p>Set the handler after the element exists — read <code>video.duration</code> inside the callback.</p>

  <video id=clip controls>

    <source src=/video/count.mp4 type=video/mp4>

    Your browser does not support video.

  </video>

  <div class=log id=log>Loading media… duration is NaN until metadata arrives.</div>



  <script>var video=document.getElementById("clip"),log=document.getElementById("log");video.ondurationchange=function(){var n=Math.floor(video.duration);log.innerHTML="<strong>Dynamic handler:</strong> duration is now "+n+" seconds."}</script>

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HTML ondurationchange Attribute — Dynamic Property Assignment