Remove oldIE proprietary event methods/properties.

src/event.js

@@ -86,14 +86,10 @@ jQuery.event = {
 				handlers = events[ type ] = [];
 				handlers.delegateCount = 0;
 
-				// Only use addEventListener/attachEvent if the special events handler returns false
+				// Only use addEventListener if the special events handler returns false
 				if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
-					// Bind the global event handler to the element
 					if ( elem.addEventListener ) {
 						elem.addEventListener( type, eventHandle, false );
-
-					} else if ( elem.attachEvent ) {
-						elem.attachEvent( "on" + type, eventHandle );
 					}
 				}
 			}
@@ -580,26 +576,11 @@ jQuery.event = {
 // The 1.7 special event interface should provide all the hooks needed now.
 jQuery.event.handle = jQuery.event.dispatch;
 
-jQuery.removeEvent = document.removeEventListener ?
-	function( elem, type, handle ) {
-		if ( elem.removeEventListener ) {
-			elem.removeEventListener( type, handle, false );
-		}
-	} :
-	function( elem, type, handle ) {
-		var name = "on" + type;
-
-		if ( elem.detachEvent ) {
-
-			// #8545, #7054, preventing memory leaks for custom events in IE6-8
-			// detachEvent needed property on element, by name of that event, to properly expose it to GC
-			if ( typeof elem[ name ] === "undefined" ) {
-				elem[ name ] = null;
-			}
-
-			elem.detachEvent( name, handle );
-		}
-	};
+jQuery.removeEvent = function( elem, type, handle ) {
+	if ( elem.removeEventListener ) {
+		elem.removeEventListener( type, handle, false );
+	}
+};
 
 jQuery.Event = function( src, props ) {
 	// Allow instantiation without the 'new' keyword
@@ -614,7 +595,7 @@ jQuery.Event = function( src, props ) {
 
 		// Events bubbling up the document may have been marked as prevented
 		// by a handler lower down the tree; reflect the correct value.
-		this.isDefaultPrevented = ( src.defaultPrevented || src.returnValue === false ||
+		this.isDefaultPrevented = ( src.defaultPrevented ||
 			src.getPreventDefault && src.getPreventDefault() ) ? returnTrue : returnFalse;
 
 	// Event type
@@ -648,32 +629,17 @@ jQuery.Event.prototype = {
 		this.isDefaultPrevented = returnTrue;
 
 		var e = this.originalEvent;
-		if ( !e ) {
-			return;
-		}
-
-		// if preventDefault exists run it on the original event
-		if ( e.preventDefault ) {
+		if ( e && e.preventDefault ) {
 			e.preventDefault();
-
-		// otherwise set the returnValue property of the original event to false (IE)
-		} else {
-			e.returnValue = false;
 		}
 	},
 	stopPropagation: function() {
 		this.isPropagationStopped = returnTrue;
 
 		var e = this.originalEvent;
-		if ( !e ) {
-			return;
-		}
-		// if stopPropagation exists run it on the original event
-		if ( e.stopPropagation ) {
+		if ( e && e.stopPropagation ) {
 			e.stopPropagation();
 		}
-		// otherwise set the cancelBubble property of the original event to true (IE)
-		e.cancelBubble = true;
 	},
 	stopImmediatePropagation: function() {
 		this.isImmediatePropagationStopped = returnTrue;