https://pecom.ru/bitrix/js/main/polyfill/customevent/main.polyfill.customevent.js

1/**
2 * window.CustomEvent polyfill
3 */
4;(function() {
5	'use strict';
6
7	try
8	{
9		new window.CustomEvent('bx-test-custom-event', {
10			bubbles: true,
11  			cancelable: true
12		});
13	}
14	catch (exception)
15	{
16		var CustomEventPolyfill = function(event, params)
17		{
18			params = params || {};
19			params.bubbles = !!params.bubbles;
20			params.cancelable = !!params.cancelable;
21
22			var customEvent = document.createEvent('CustomEvent');
23
24			customEvent.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
25
26			var originalPreventFunction = customEvent.preventDefault;
27
28			customEvent.preventDefault = function()
29			{
30				Object.defineProperty(this, 'defaultPrevented', {
31					get: function() { return true; }
32				});
33
34				originalPreventFunction.call(this);
35			};
36
37			return customEvent;
38		};
39
40		CustomEventPolyfill.prototype = window.Event.prototype;
41
42		window.CustomEvent = CustomEventPolyfill;
43	}
44
45})();