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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>onvolumechange — dynamic handler</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}#log{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>audio.onvolumechange</h1>

  <p>Change volume from the native audio controls — the log updates below.</p>

  <audio controls id=myMedia>

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

  </audio>

  <div id=log aria-live=polite>Waiting for volume change…</div>



  <script>var media=document.getElementById("myMedia"),log=document.getElementById("log");media.onvolumechange=function(){log.textContent=this.muted?"Audio muted":"Volume: "+Math.round(100*this.volume)+"%",log.style.background="#eff6ff",log.style.borderColor="#bfdbfe",log.style.color="#1e40af"}</script>

</body>

</html>

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HTML onvolumechange Attribute — dynamic assignment