Baseline Widely available
The CSSNamespaceRule interface describes an object representing a single CSS @namespace at-rule.
Inherits properties from its ancestor CSSRule.
CSSNamespaceRule.namespaceURI
Returns a string containing the text of the URI of the given namespace.
CSSNamespaceRule.prefix
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.
@namespace url("http://www.w3.org/1999/xhtml");
const myRules = document.styleSheets[0].cssRules;
console.log(myRules[0]); // A CSSNamespaceRule
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