The lookupNamespaceURI method looks up the namespace URI associated to the given namespace prefix within an XPath expression evaluated by the XPathEvaluator interface.
The lookupNamespaceURI method looks up the namespace URI associated to the given namespace prefix within an XPath expression evaluated by the XPathEvaluator interface.
js
lookupNamespaceURI(prefix)
prefixA string representing the prefix to look for.
A string representing the associated namespace URI or null if none is found.
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https://developer.mozilla.org/en-US/docs/Web/API/XPathNSResolver/lookupNamespaceURI