All: Drop support for IE & some other browsers (but mostly IE)

Closes gh-2249

1 files changed, 0 insertions, 44 deletions

diff --git a/ui/safe-active-element.js b/ui/safe-active-element.js
deleted file mode 100644
index 9d6968e08..000000000
--- a/ui/safe-active-element.js
+++ /dev/null
@@ -1,44 +0,0 @@
-( function( factory ) {
-	"use strict";
-
-	if ( typeof define === "function" && define.amd ) {
-
-		// AMD. Register as an anonymous module.
-		define( [ "jquery", "./version" ], factory );
-	} else {
-
-		// Browser globals
-		factory( jQuery );
-	}
-} )( function( $ ) {
-"use strict";
-
-return $.ui.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;
-};
-
-} );