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What does the xmlns attribute in the <html> element specify?

The xmlns attribute specifies the XML Namespace of the document.

The default value is http://www.w3.org/1999/xhtml, and it is required in documents parsed with XML parsers and optional in text/html documents. This attribute ensures that the document is correctly interpreted within the XML framework, maintaining consistency and compatibility across different XML-based applications.

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>XML Namespace Example</title>
  </head>
  <body>
    <p>Content goes here.</p>
  </body>
</html>
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