Definition
DOM Standard defines XPathEvaluatorBase
interface mixin XPathEvaluatorBase {
[NewObject] XPathExpression createExpression(DOMString expression, optional XPathNSResolver? resolver = null);
Node createNSResolver(Node nodeResolver); // legacy
// XPathResult.ANY_TYPE = 0
XPathResult evaluate(DOMString expression, Node contextNode, optional XPathNSResolver? resolver = null, optional unsigned short type = 0, optional XPathResult? result = null);
};