reduce complexity of ready further, and try manipulating DOM to make sure we're really ready

src/core.js

@@ -59,18 +59,16 @@ var jQuery = function( selector, context ) {
 	// The deferred used on DOM ready
 	readyList,
 
-	// The ready event handler
-	// Cleanup function for the document ready method
+	// The ready event handler and self cleanup method
 	DOMContentLoaded = function() {
 		if ( document.addEventListener ) {
 			document.removeEventListener( "DOMContentLoaded", DOMContentLoaded, false );
-			jQuery.ready();
-		} else if ( document.readyState !== "loading" ) {
-			// if document.addEventListener isn't present, we assume detachEvent is!
-			// Make sure body exists by checking readystate, at least, in case IE gets a little overzealous (ticket #5443).
+		} else {
+			// we're here because readyState !== "loading" in oldIE
+			// which is good enough for us to call the dom ready!
 			document.detachEvent( "onreadystatechange", DOMContentLoaded );
-			jQuery.ready();
 		}
+		jQuery.ready();
 	},
 
 	// Save a reference to some core methods

test/data/event/asyncReady.html

@@ -14,6 +14,7 @@ if ( document.attachEvent ) {
 		el.type = "text/javascript";
 		el.onload = function() {
 			jQuery( document ).ready(function() {
+				jQuery("body").append("<div>modifying DOM</div>");
 				window.parent.iframeCallback( true );
 			});
 	    }

test/data/event/syncReady.html

@@ -8,6 +8,7 @@
 <body>
 <script type="text/javascript">
 jQuery( document ).ready(function () {
+	jQuery("body").append("<div>modifying DOM</div>");
 	window.parent.iframeCallback( true );
 });
 </script>