Evaluate XPath expression in the DOM: https://remarkabl.org/blog/2022/12/05/javascript-evaluate-xpath/

evaluate-xpath-expression.js

/**
 * Evaluate XPath expression.
 *
 * @param {string} xpathExpression - XPath expression.
 * @param {HTMLElement} [contextNode=document] - Context node for the query.
 * @returns {HTMLElement[]}
 */
function evaluateXPath(xpathExpression, contextNode = document) {
  const result = document.evaluate(
    xpathExpression,
    contextNode,
    null,
    XPathResult.ANY_TYPE,
    null
  );

  let element;
  const elements = [];

  while ((element = result.iterateNext())) {
    elements.push(element);
  }

  return elements;
}