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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>Dynamic classid Example</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 1rem;font-size:1.25rem;color:#0f172a}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>

</head>

<body>

  <h1>Dynamic element.classid</h1>

  <object id=dynamicObject width=200 height=100>

    Your browser does not support this object.

  </object>

  <p class=hint>JavaScript sets <code>object.classid = "clsid:NEW-EXAMPLE-ID"</code>. Legacy pattern — not used in modern web apps.</p>

  <script>document.getElementById("dynamicObject").classid="clsid:NEW-EXAMPLE-ID"</script>

</body>

</html>

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HTML classid Attribute — Dynamic JavaScript