https://valta.ru/bitrix/js/main/pageobject/pageobject.js

1window.BX = BX || {};
2
3BX.PageObject = {
4	getRootWindow: function()
5	{
6		return BX.PageObject.getTopWindowOfCurrentHost(window);
7	},
8
9	isCrossOriginObject: function(currentWindow)
10	{
11		try
12		{
13			void currentWindow.location.host;
14		}
15		catch (e)
16		{
17			// cross-origin object
18			return true;
19		}
20
21		return false;
22	},
23
24	getTopWindowOfCurrentHost: function(currentWindow)
25	{
26		if (
27			!BX.PageObject.isCrossOriginObject(currentWindow.parent)
28			&& currentWindow.parent !== currentWindow
29			&& currentWindow.parent.location.host === currentWindow.location.host
30		)
31		{
32			return BX.PageObject.getTopWindowOfCurrentHost(currentWindow.parent);
33		}
34
35		return currentWindow;
36	},
37
38	getParentWindowOfCurrentHost: function(currentWindow)
39	{
40		if (BX.PageObject.isCrossOriginObject(currentWindow.parent))
41		{
42			return currentWindow;
43		}
44
45		return currentWindow.parent;
46	}
47};