Stop trying to emulate the focus/blur event in IE, doesn't work as one might expect, anyway. Instead, implement the focusin/focusout events in all other browsers - which creates a much better parity across all browsers. Uses event capturing instead of bubbling to make it happen. Thanks to Alexander for the recommendation and to Joern Zaefferer for the original focus/blur delegation code.

Jörn Zaefferer · jeresig · commit 03481a52c72e · 2009-12-21T16:10:21.000-05:00
diff --git a/src/event.js b/src/event.js
@@ -720,24 +720,23 @@ function trigger( type, elem, args ) {
 }
 
 // Create "bubbling" focus and blur events
-if ( !jQuery.support.focusBubbles ) {
+if ( document.addEventListener ) {
+	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ){
+		jQuery.event.special[ fix ] = {
+			setup: function() {
+				this.addEventListener( orig, handler, true );
+			}, 
+			teardown: function() { 
+				this.removeEventListener( orig, handler, true );
+			}
+		};
 
-jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ){
-	jQuery.event.special[ orig ] = {
-		setup: function() {
-			jQuery.event.add( this, fix, ieHandler );
-		}, 
-		teardown: function() { 
-			jQuery.event.remove( this, fix, ieHandler );
+		function handler( e ) { 
+			e = jQuery.event.fix( e );
+			e.type = fix;
+			return jQuery.event.handle.call( this, e );
 		}
-	};
-
-	function ieHandler() { 
-		arguments[0].type = orig;
-		return jQuery.event.handle.apply(this, arguments);
-	}
-});
-
+	});
 }
 
 jQuery.each(["bind", "one"], function(i, name) {
diff --git a/src/support.js b/src/support.js
@@ -111,7 +111,6 @@
 	
 	jQuery.support.submitBubbles = eventSupported("submit");
 	jQuery.support.changeBubbles = eventSupported("change");
-	jQuery.support.focusBubbles = eventSupported("focus");
 
 	// release memory in IE
 	root = script = div = all = a = null;
diff --git a/test/delegatetest.html b/test/delegatetest.html
@@ -75,6 +75,24 @@ <h2>Change Tests</h2>
 	        <td id='textbind' class="red">TEXT</td>
 	        <td id='textareabind' class="red">TEXTAREA</td>
 	    </tr>
+	    <tr>
+	        <td>Focusin:</td>
+	        <td id='selectfocus' class="red">SELECT</td>
+	        <td id='mselectfocus' class="red">MULTI</td>
+	        <td id='checkboxfocus' class="red">CHECKBOX</td>
+	        <td id='radiofocus' class="red">RADIO</td>
+	        <td id='textfocus' class="red">TEXT</td>
+	        <td id='textareafocus' class="red">TEXTAREA</td>
+	    </tr>
+	    <tr>
+	        <td>Focusout:</td>
+	        <td id='selectblur' class="red">SELECT</td>
+	        <td id='mselectblur' class="red">MULTI</td>
+	        <td id='checkboxblur' class="red">CHECKBOX</td>
+	        <td id='radioblur' class="red">RADIO</td>
+	        <td id='textblur' class="red">TEXT</td>
+	        <td id='textareablur' class="red">TEXTAREA</td>
+	    </tr>
         </table>
         <h2>Submit Tests</h2>
         <table>
@@ -112,6 +130,12 @@ <h2>Submit Tests</h2>
 
         <script type='text/javascript'>
 	jQuery.fn.addChangeTest = function( id, prevent ) {
+		this.bind("focusin", function(){
+			jQuery(id + "focus").blink();
+		}).bind("focusout", function(){
+			jQuery(id + "blur").blink();
+		});
+
 		return this.bind("change", function(e){
 			jQuery(id + "bind").blink();
 		}).live("change", function(e){
