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Implement mouseenter/mouseleave event referring to http://www.quirksmode.org/js/events_mouse.html#link8 and jQuery source code(not dependent on jQuery). The old implementation is wrong. When moving mouse from a parent element into a child element, it would trigger mouseleave event, which should not. And the old test about mouseenter/mouseleave is wrong too. It just triggers mouseover and mouseout events, cannot describe the process of mouse moving from one element to another element, which is important for mouseenter/mouseleave. Closes #2131, #1811