CSSNamespaceRule.namespaceURI

The read-only namespaceURI property of the CSSNamespaceRule returns a DOMString containing the text of the URI of the given namespace.

Syntax

var namespaceURI = CSSNamespaceRule.namespaceURI

Returns

A DOMString containing a URI.

Examples

The stylesheet includes a namespace as the only rule. Therefore the first CSSRule returned will be a CSSNamespaceRule. The value of the namespaceURI property will be http://www.w3.org/1999/xhtml.

@namespace url(http://www.w3.org/1999/xhtml);
let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].namespaceURI); //http://www.w3.org/1999/xhtml

Specifications

Specification Status Comment
CSS Object Model (CSSOM)
The definition of 'namespaceURI' in that specification.
Working Draft Initial definition.

Browser compatibility

BCD tables only load in the browser