An XPathExpression is a compiled XPath query returned from document.createExpression(). It has a method evaluate() which can be used to execute the compiled XPath.
contextNode, type, result) - provide a context node/document, XPathResult constant, and XPathResult to store the query or null to return a new XPathResult.contextNode, contextPosition, contextSize, type, result) - provide a context node/document, context position, context size, XPathResult constant, and XPathResult to store the query or null to return a new XPathResult.
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https://developer.mozilla.org/en-US/docs/Web/API/XPathExpression