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< 		var
< 			el = document.createElement("div"),
< 			unwrappedEl = el.wrappedJSObject || el;
---
> 		var el = document.createElement("div");
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< 		var isSupported = (eventName in unwrappedEl);
---
> 		var isSupported = (eventName in el);
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< 			isSupported = typeof unwrappedEl[eventName] === "function";
---
> 			isSupported = typeof el[eventName] === "function";
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< 		unwrappedEl = null;