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  <meta charset=UTF-8>

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

  <title>version — 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}output{display:block;margin-top:.75rem;padding:.5rem .75rem;background:#f1f5f9;border-radius:6px;font-size:.875rem}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

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  <h1>Dynamic version attribute</h1>

  <p>This sets <code>version="4.01"</code> on <code>&lt;html&gt;</code> for demonstration.</p>



  <output id=result>Checking html version attribute...</output>



  <script>document.documentElement.setAttribute("version","4.01"),document.getElementById("result").textContent="html version = "+document.documentElement.getAttribute("version")</script>



  <p class=hint>Modern browsers do not use this attribute for rendering decisions.</p>

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HTML version Attribute — set with JavaScript