CSSNamespaceRule.prefix

The read-only prefix property of the CSSNamespaceRule returns a DOMString with the name of the prefix associated to this namespace. If there is no such prefix, it returns an empty string.

Syntax

var prefix = CSSNamespaceRule.prefix

Returns

A DOMString containing the prefix associated to this namespace. If there is no prefix an empty string.

Examples

The stylesheet includes two namespace rules. The first has no prefix the second the prefix svg. Two CSSNamespaceRule objects will be returned. The value of the prefix property for the first will be an empty string, for the second svg.

@namespace url(http://www.w3.org/1999/xhtml);
@namespace svg url(http://www.w3.org/2000/svg);

let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].namespaceURI); an empty string ""
console.log(myRules[1].namespaceURI); "svg"

Specifications

Browser compatibility