HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onprogress — 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}#status{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>audio.onprogress</h1>

  <p>Handler assigned in script — reload to see buffering updates.</p>

  <audio id=dynamicAudio controls preload=auto>

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

  </audio>

  <p id=status>Loading audio…</p>



  <script>var audio=document.getElementById("dynamicAudio"),status=document.getElementById("status"),ready=!1;function bufferPercent(t){if(!t.duration||!isFinite(t.duration)||0===t.buffered.length)return 0;var e=t.buffered.end(t.buffered.length-1);return Math.min(100,Math.round(e/t.duration*100))}audio.onprogress=function(t){if(!ready){var e=bufferPercent(t.target);status.textContent="Buffering… "+e+"% loaded",status.style.background="#eff6ff",status.style.borderColor="#bfdbfe",status.style.color="#1e40af"}},audio.oncanplaythrough=function(){ready=!0,status.textContent="Audio loaded and ready to play!",status.style.background="#f0fdf4",status.style.borderColor="#bbf7d0",status.style.color="#166534"}</script>

</body>

</html>

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HTML onprogress Attribute — dynamic assignment