The read-only namespaceURI property of the CSSNamespaceRule returns a string containing the text of the URI of the given namespace.
The read-only namespaceURI property of the CSSNamespaceRule returns a string containing the text of the URI of the given namespace.
A string containing a URI.
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.
css
@namespace url(http://www.w3.org/1999/xhtml);
js
let myRules = document.styleSheets[0].cssRules; console.log(myRules[0].namespaceURI); //http://www.w3.org/1999/xhtml
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
namespaceURI |
47 | 12 | 59 | 9 | 36 | 10.1 | 47 | 47 | 59 | 36 | 10.3 | 5.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/CSSNamespaceRule/namespaceURI