HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onloadedmetadata — mm:ss</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}#duration{padding:.75rem 1rem;background:#fef3c7;border:1px solid #fde68a;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px}</style>

</head>

<body>

  <h1>Formatted duration label</h1>

  <p>Length shown as m:ss when metadata is ready.</p>

  <audio id=player controls>

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

  </audio>

  <div id=duration>--:--</div>



  <script>var audio=document.getElementById("player"),label=document.getElementById("duration");function formatDuration(t){var a=Math.floor(t/60),e=Math.floor(t%60);return a+":"+String(e).padStart(2,"0")}audio.addEventListener("loadedmetadata",(function(){isFinite(audio.duration)&&(label.textContent="Length: "+formatDuration(audio.duration))}))</script>

</body>

</html>

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HTML onloadedmetadata Attribute — Format mm:ss