Changed to using data-cappuccino-view attribute

AppKit/CPView.j

@@ -291,7 +291,7 @@ var CPViewFlags                     = { },
 
         CPDOMDisplayServerSetStyleLeftTop(_DOMElement, NULL, _CGRectGetMinX(aFrame), _CGRectGetMinY(aFrame));
         CPDOMDisplayServerSetStyleSize(_DOMElement, width, height);
-        _DOMElement.className = [self className];
+        _DOMElement.setAttribute("data-cappuccino-view", [self className]);
 
         _DOMImageParts = [];
         _DOMImageSizes = [];