HTML DOM Element namespaceURI attribute

Definition and usage

namespaceURI The attribute returns the URI of the element's namespace.

namespaceURI The attribute is read-only.

namespaceURI The attribute has no practical use in HTML.

See also:

isDefaultNamespace() method

Instance

Example 1

Get the namespace URI of an element in an HTML document:

let uri = element.namespaceURI;

Try it yourself

Example 2

Get the namespace URI of an element in an XHTML document:

let uri = element.namespaceURI;

Try it yourself

Comment

The default namespace URI for HTML and XHTML documents is the same.

All HTML elements inherit their parent's namespace URI:

http://www.w3.org/1999/xhtml

Syntax

element.namespaceURI

Return value

Type Description
String The URI of the element's namespace.
null if the element is not in a namespace.

Browser support

element.namespaceURI It is a feature of DOM Level 2 (2001).

All browsers fully support it:

Chrome IE Edge Firefox Safari Opera
Chrome IE Edge Firefox Safari Opera
Support 9-11 Support Support Support Support