HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onloadstart — inline</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}#status{padding:.75rem 1rem;background:#fef3c7;border:1px solid #fde68a;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <h1>loadstart → loading message</h1>

  <p>Status updates when the browser starts fetching media.</p>

  <audio controls onloadstart=handleLoadStart(this)>

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

    Your browser does not support the audio element.

  </audio>

  <p id=status>Waiting for loadstart…</p>



  <script>function handleLoadStart(t){document.getElementById("status").textContent="Loading: "+(t.currentSrc||"media file"),document.getElementById("status").style.background="#eff6ff",document.getElementById("status").style.borderColor="#bfdbfe"}</script>

</body>

</html>

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HTML onloadstart Attribute — Inline handler