CSSNamespaceRule: prefix property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

Value

A string 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.

css
@namespace url(http://www.w3.org/1999/xhtml);
@namespace svg url(http://www.w3.org/2000/svg);
js
let myRules = document.styleSheets[0].cssRules;
console.log(myRules[0].namespaceURI); // an empty string ""
console.log(myRules[1].namespaceURI); // "svg"

Specifications

Specification
CSS Object Model (CSSOM)
# dom-cssnamespacerule-prefix

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
prefix

Legend

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Full support
Full support