mootools/mootools-core — pull request #2139 by ibolmo (2011-11-27 20:18:28+00:00)
Title: Fix #2089. Feature detect for mouseenter and (assume) mouseleave.

TESTED: IE6-9, Chrome latest, Firefox 3-5, 8, 10, Opera 11, Safari 5

Using Element.Delegation.html.