From e3ff671ea38dcffd8950379f51a6e57207b68c5b Mon Sep 17 00:00:00 2001
From: =?utf8?q?Scott=20Gonz=C3=A1lez?= <scott.gonzalez@gmail.com>
Date: Fri, 27 Mar 2015 12:00:55 -0400
Subject: [PATCH] Core: Work around more IE activeElement bugs

Closes gh-1523

(cherry picked from commit 0de27b0609e8f6f9751ab7cce28492e18206d86d)
---
 ui/core.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ui/core.js b/ui/core.js
index 1e40c9443..e712bcebb 100644
--- a/ui/core.js
+++ b/ui/core.js
@@ -57,6 +57,13 @@ $.extend( $.ui, {
 			activeElement = document.body;
 		}
 
+		// Support: IE 9 - 11 only
+		// IE may return null instead of an element
+		// Interestingly, this only seems to occur when NOT in an iframe
+		if ( !activeElement ) {
+			activeElement = document.body;
+		}
+
 		// Support: IE 11 only
 		// IE11 returns a seemingly empty object in some cases when accessing
 		// document.activeElement from an <iframe>
-- 
2.39.5