gitlab-org--gitlab-foss/app/assets/javascripts/extensions/element.js.es6

/* global Element */
/* eslint-disable consistent-return, max-len, no-empty, no-plusplus, func-names */

Element.prototype.closest = Element.prototype.closest || function closest(selector, selectedElement = this) {
  if (!selectedElement) return;
  return selectedElement.matches(selector) ? selectedElement : Element.prototype.closest(selector, selectedElement.parentElement);
};

if (!Element.prototype.matches) {
  Element.prototype.matches =
      Element.prototype.matchesSelector ||
      Element.prototype.mozMatchesSelector ||
      Element.prototype.msMatchesSelector ||
      Element.prototype.oMatchesSelector ||
      Element.prototype.webkitMatchesSelector ||
      function (s) {
        const matches = (this.document || this.ownerDocument).querySelectorAll(s);
        let i = matches.length;
        while (--i >= 0 && matches.item(i) !== this) {}
        return i > -1;
      };
}