Function getReferenceNode

static/bootstrap4/js/bootstrap.bundle.js:1665–1667

* Returns the reference node of the reference object, or the reference object itself. * @method * @memberof Popper.Utils * @param {Element|Object} reference - the reference element (the popper will be relative to this) * @returns {Element} parent

(reference)

   * @returns {Element} parent
   */
  function getReferenceNode(reference) {
    return reference && reference.referenceNode ? reference.referenceNode : reference;
  }

  var isIE11 = isBrowser && !!(window.MSInputMethodContext && document.documentMode);
  var isIE10 = isBrowser && /MSIE 10/.test(navigator.userAgent);