content/assets/javascripts/closest-polyfill.js


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/*
 * Polyfill for browsers that do not support Element.closest()
 */
if (!Element.prototype.matches) {
  Element.prototype.matches = Element.prototype.msMatchesSelector ||
    Element.prototype.webkitMatchesSelector;
}

if (!Element.prototype.closest) {
  Element.prototype.closest = function(s) {
    var el = this;

    do {
      if (el.matches(s)) return el;
      el = el.parentElement || el.parentNode;
    } while (el !== null && el.nodeType === 1);
    return null;
  };
}