HTML DOM Element namespaceURI

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

let uri = element.namespaceURI;

Get the namespace URI of an element an XHTML document:

let uri = element.namespaceURI;

Note

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

All HTML elements inherit the namespace URI of their parents:

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

The namespaceURI property returns the URI of an elements namespace.

The namespaceURI property is read-only.

The namespaceURI property has no practical use in HTML.

element.namespaceURI

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

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

It is fully supported in all browsers:


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