I believe the jQuery version attaches the handlers to document which allows it to use event bubbling. I got this info from a comment posted here by jresig hims

I believe the jQuery version attaches the handlers to document which allows it to use event bubbling. I got this info from a comment posted here by jresig himself. http://news.ycombinator.com/item?id=406653 http://news.ycombinator.com/item?id=406653