HTML <html> xmlns Attribute
 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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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
The xmlns attribute is supported in all major browsers.
Syntax
Attribute Values
| Value |
Description |
| http://www.w3.org/1999/xhtml |
The namespace to use (for XHTML documents) |
HTML <html> tag
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