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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>typemustmatch — JavaScript 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 .75rem;font-size:1.25rem;color:#0f172a}object{display:block;width:100%;max-width:32rem;height:20rem;border:1px solid #cbd5e1;border-radius:8px;background:#fff}button{margin-top:.75rem;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer;font:inherit}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Dynamic typemustmatch</h1>



  <object id=dynamicObject data=/files/honey-bee.pdf type=application/pdf>

    <p>Your browser does not support PDFs.

      <a href=/files/honey-bee.pdf>Download the PDF</a>.

    </p>

  </object>



  <button type=button onclick=enableTypeMustMatch()>Enable typemustmatch</button>



  <script>function enableTypeMustMatch(){document.getElementById("dynamicObject").typeMustMatch=!0,alert("typeMustMatch set to true on the object element.")}</script>



  <p class=hint>Click the button to set <code>object.typeMustMatch = true</code> (the JavaScript property for the boolean attribute).</p>

</body>

</html>

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HTML typemustmatch Attribute — dynamic toggle