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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>preload — three values</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}.block{margin-bottom:1.25rem;max-width:420px}h2{margin:0 0 .35rem;font-size:.9375rem;color:#0f172a}audio{display:block;width:100%;margin-bottom:.35rem}.hint{font-size:.8125rem;color:#64748b;margin:0}.tip{margin-top:1rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:420px;background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af}</style>

</head>

<body>

  <h1>preload values</h1>



  <div class=block>

    <h2>preload="none"</h2>

    <audio controls preload=none>

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

    </audio>

    <p class=hint>No download until play.</p>

  </div>



  <div class=block>

    <h2>preload="metadata"</h2>

    <audio controls preload=metadata id=metaAudio>

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

    </audio>

    <p class=hint id=metaStatus>Loading metadata…</p>

  </div>



  <div class=block>

    <h2>preload="auto"</h2>

    <audio controls preload=auto>

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

    </audio>

    <p class=hint>May buffer full file on load.</p>

  </div>



  <p class=tip>Open DevTools → Network and reload to compare bytes downloaded before pressing play.</p>



  <script>var meta=document.getElementById("metaAudio"),status=document.getElementById("metaStatus");meta.addEventListener("loadedmetadata",(function(){status.textContent="Duration loaded: "+Math.round(meta.duration)+" seconds"}))</script>

</body>

</html>

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HTML preload Attribute — none, metadata, auto