GeezerVison is showing developer.mozilla.org — CSSNamespaceRule - Web APIs | MDN
CSSNamespaceRule
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2017.
The CSSNamespaceRule interface describes an object representing a single CSS @namespace at-rule.
Inherits properties from its ancestor CSSRule.
CSSNamespaceRule.namespaceURI Read only-
Returns a string containing the text of the URI of the given namespace.
CSSNamespaceRule.prefix Read only-
Returns a string with the name of the prefix associated to this namespace. If there is no such prefix, returns an empty string.
Inherits methods from its ancestor CSSRule.
The stylesheet includes a namespace as the only rule. Therefore the first CSSRule returned will be a CSSNamespaceRule.
css
@namespace url("http://www.w3.org/1999/xhtml");
js
const myRules = document.styleSheets[0].cssRules;
console.log(myRules[0]); // A CSSNamespaceRule