HTML Reference

HTML html xmlns Attribute

HTML <html> tag : A simple XHTML document, with the minimum of required tags

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

Attribute Values

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

❮ HTML <html> tag

Contact US

Email:

Content:

HTML Reference