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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>HTML classid CLSID 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>clsid: GUID format</h1>

  <object classid=clsid:XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX>

    <p>Your browser does not support this object.</p>

  </object>

  <p class=hint>CLSID values identify COM/ActiveX controls. This example is for learning legacy HTML only.</p>

</body>

</html>

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HTML classid Attribute — CLSID Example