sounisi5011

/**
 * Updates the passed dialog to retain focus and restore it when the dialog is closed. Won't
 * upgrade a dialog more than once. Supports IE11+ and is a no-op otherwise.
 * @param {!HTMLDialogElement} dialog to upgrade
 */
window.registerFocusRestoreDialog = (function() {
  var WeakMap = window.WeakMap;
  var registered =
    typeof WeakMap === 'function'
      ? new WeakMap()

sounisi5011

/**
 * @see https://dom.spec.whatwg.org/#interface-element
 * @see https://developer.mozilla.org/docs/Web/API/Element/matches#Polyfill
 * @see https://gist.github.com/jonathantneal/3062955
 * @see https://github.com/jonathantneal/closest
 */

(function(global){
  var Element;
  var ElementPrototype;