HTML <html> xmlns Attribute
Example
A simple XHTML document, with the minimum of required tags:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<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, invalid in HTML 4.01, and optional in HTML5.
Note: 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.
Browser Support
| Attribute | |||||
|---|---|---|---|---|---|
| xmlns | Yes | Yes | Yes | Yes | Yes |
Syntax
<html xmlns="http://www.w3.org/1999/xhtml">
Attribute Values
| Value | Description |
|---|---|
| http://www.w3.org/1999/xhtml | The namespace to use (for XHTML documents) |
❮ HTML <html> tag
