Core: Move safeActiveElement into its own module

Ref #9647

1 files changed, 1 insertions, 29 deletions

diff --git a/ui/core.js b/ui/core.js
index beb3fcbcb..f0eef1328 100644
--- a/ui/core.js
+++ b/ui/core.js
@@ -29,6 +29,7 @@
 			"./labels",
 			"./jquery-1-7",
 			"./plugin",
+			"./safe-active-element",
 			"./version"
 		], factory );
 	} else {
@@ -41,35 +42,6 @@
 $.extend( $.ui, {
 
 	// Internal use only
-	safeActiveElement: function( document ) {
-		var activeElement;
-
-		// Support: IE 9 only
-		// IE9 throws an "Unspecified error" accessing document.activeElement from an <iframe>
-		try {
-			activeElement = document.activeElement;
-		} catch ( error ) {
-			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>
-		if ( !activeElement.nodeName ) {
-			activeElement = document.body;
-		}
-
-		return activeElement;
-	},
-
-	// Internal use only
 	safeBlur: function( element ) {
 
 		// Support: IE9 - 10 only