From c5fa113f401c905fd8b1d5dad5fba552cd78db8d Mon Sep 17 00:00:00 2001
From: matthemsteger <github@sharecentric.com>
Date: Thu, 20 Aug 2015 22:07:49 -0400
Subject: [PATCH] Fix Access Denied Errors in IE 11

Fix access denied errors in IE 11 when a cross origin frame tries to use getOwnPropertyNames. Apparently IE has a bug where it uses the function defined in the original window.
---
 lib/weakmap.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/weakmap.js b/lib/weakmap.js
index ed2ddd9..efceb8b 100644
--- a/lib/weakmap.js
+++ b/lib/weakmap.js
@@ -30,6 +30,7 @@
 
 void function(global, undefined_, undefined){
   var getProps = Object.getOwnPropertyNames,
+      cachedWindowNames = typeof window === 'object' ? Object.getOwnPropertyNames(window) : [],
       defProp  = Object.defineProperty,
       toSource = Function.prototype.toString,
       create   = Object.create,
@@ -87,7 +88,16 @@ void function(global, undefined_, undefined){
 
     // common per-object storage area made visible by patching getOwnPropertyNames'
     define(Object, namedFunction('getOwnPropertyNames', function getOwnPropertyNames(obj){
-      var props = getProps(obj);
+      var coercedObj = Object(obj), props;
+      if (coercedObj.toString() === '[object Window]') {
+          try {
+              props = getProps(obj);
+          } catch (e) {
+              props = cachedWindowNames;
+          }
+      } else {
+          props = getProps(obj);
+      }
       if (hasOwn.call(obj, globalID))
         props.splice(props.indexOf(globalID), 1);
       return props;