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<!-->
<!DOCTYPE>
<a>
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<th>
<thead>
<title>
<tr>
<tt>
<u>
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<var>

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>

Try it yourself »

Definition and Usage

The xmlns attribute specifies the xml namespace for a document.

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

However, the HTML validator at 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.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The xmlns attribute is supported in all major browsers.


Syntax

<html xmlns="value">

Attribute Values

Value Description
http://www.w3.org/1999/xhtml The namespace to use (for XHTML documents)


HTML html Tag Reference HTML <html> tag

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