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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>onprogress — audio 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:#eff6ff;border:1px solid #bfdbfe;color:#1e40af}</style>

</head>

<body>

  <h1>onprogress on audio</h1>

  <p>Reload the page or open in a new tab — status updates as the file buffers.</p>

  <audio controls preload=auto onprogress=updateProgress(event) oncanplaythrough=markReady()>

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

  </audio>

  <p id=status>Loading audio…</p>



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

</body>

</html>

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HTML onprogress Attribute — Inline audio handler