HTML Code

<!DOCTYPE html>

<html lang=en xmlns=http://www.w3.org/1999/xhtml>

<head>

  <meta charset=UTF-8>

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

  <title>xmlns — XHTML namespace</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}.hint{font-size:.8125rem;color:#64748b;margin-top:.75rem}</style>

</head>

<body>

  <h1>XHTML namespace on html</h1>

  <p>This page declares <code>xmlns="http://www.w3.org/1999/xhtml"</code> on the root element.</p>



  <p class=hint>Regular HTML5 pages do <strong>not</strong> need this. It is required when serving documents as XHTML (XML). Browsers may ignore it on typical <code>text/html</code> pages.</p>

</body>

</html>

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HTML xmlns Attribute — XHTML root