Tooltip: Fix the accessible properties IE exposes

Author: jzaefferer

ui/jquery.ui.tooltip.js

@@ -128,11 +128,15 @@ $.widget( "ui.tooltip", {
 		// we have to check first to avoid defining a title if none exists
 		// (we don't want to cause an element to start matching [title])
 
-		// We don't use removeAttr as that causes the native tooltip to show
-		// up in IE (9 and below, didn't yet test 10). Happens only when removing
-		// inside the mouseover handler.
+		// We use removeAttr only for key events, to allow IE to export the correct
+		// accessible attributes. For mouse events, set to empty string to avoid
+		// native tooltip showing up (happens only when removing inside mouseover).
 		if ( target.is( "[title]" ) ) {
-			target.attr( "title", "" );
+			if ( event && event.type === "mouseover" ) {
+				target.attr( "title", "" );
+			} else {
+				target.removeAttr( "title" );
+			}
 		}
 
 		// ajaxy tooltip can update an existing one