HTML <html> xmlnsAttribute
Example
A simple XHTML document with the minimum required tags:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8">
<title>Document Title</title>
</head>
<body>
Document content......
</body>
</html>
<head>
<meta charset="utf-8">
<title>Document Title</title>
</head>
<body>
Document content......
</body>
</html>
Try it Yourself »
Browser Support
All major browsers support the xmlns attribute.
Definition and Usage
Note:In XHTML, the xmlns attribute is required. In HTML, the xmlns attribute is invalid.
The xmlns attribute specifies the XML namespace for the document.
However, if xmlns is not used in an XHTML document, http://w3.orgThe HTML validator can also correctly identify the document. This is because the namespace "xmlns=http://www.w3.org/1999/xhtml" is the default and will be automatically added to the <html> tag.
Syntax
<html xmlns="http://www.w3.org/1999/xhtml">
Attribute Value
| Value | Description |
|---|---|
| http://www.w3.org/1999/xhtml | The namespace to be used (for XHTML documents). |
HTML <html> Tag Other Extensions