"use strict";
  const { firstChildWithLocalName } = require("./traversal");
  const { HTML_NS } = require("./namespaces");
  
  // https://html.spec.whatwg.org/multipage/interactive-elements.html#summary-for-its-parent-details
  exports.isSummaryForParentDetails = summaryElement => {
    const parent = summaryElement.parentNode;
    if (parent === null) {
      return false;
    }
    if (parent._localName !== "details" || parent._namespaceURI !== HTML_NS) {
      return false;
    }
    return firstChildWithLocalName(parent, "summary") === summaryElement;
  };