https://www.portercable.com/modules/contrib/webform/js/webform.behaviors.js?tl1qfg

1/**
2 * @file
3 * Webform behaviors.
4 */
5
6(function ($, Drupal) {
7
8  'use strict';
9
10  // Trigger Drupal's attaching of behaviors after the page is
11  // completely loaded.
12  // @see https://stackoverflow.com/questions/37838430/detect-if-page-is-load-from-back-button
13  // @see https://stackoverflow.com/questions/20899274/how-to-refresh-page-on-back-button-click/20899422#20899422
14  var isChrome = (/chrom(e|ium)/.test(window.navigator.userAgent.toLowerCase()));
15  if (isChrome) {
16    // Track back button in navigation.
17    // @see https://stackoverflow.com/questions/37838430/detect-if-page-is-load-from-back-button
18    var backButton = false;
19    if (window.performance) {
20      var navEntries = window.performance.getEntriesByType('navigation');
21      if (navEntries.length > 0 && navEntries[0].type === 'back_forward') {
22        backButton = true;
23      }
24      else if (window.performance.navigation
25        && window.performance.navigation.type === window.performance.navigation.TYPE_BACK_FORWARD) {
26        backButton = true;
27      }
28    }
29
30    // If the back button is pressed, delay Drupal's attaching of behaviors.
31    if (backButton) {
32      var attachBehaviors = Drupal.attachBehaviors;
33      Drupal.attachBehaviors = function (context, settings) {
34        setTimeout(function () {
35          attachBehaviors(context, settings);
36        }, 300);
37      };
38    }
39  }
40
41})(jQuery, Drupal);