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HTML <html> xmlns Attribute

HTML html Tag Reference HTML <html> tag

Example

A simple XHTML document, with the minimum of required tags:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Title of the document</title>
</head>

<body>
The content of the document......
</body>

</html>

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Browser Support

The xmlns attribute is supported in all major browsers.

Definition and Usage

Note: The xmlns attribute is required in XHTML, but is invalid in HTML!

The xmlns attribute specifies the xml namespace for a document.

However, the HTML validator at http://w3.org does not complain when the xmlns attribute is missing in an XHTML document. This is because the namespace "xmlns=http://www.w3.org/1999/xhtml" is default, and will be added to the <html> tag even if you do not include it.