event-mouseenter Module
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+Adds subscription and delegation support for mouseenter and mouseleave +events. Unlike mouseover and mouseout, these events aren't fired from child +elements of a subscribed node.
+ +This avoids receiving three mouseover notifications from a setup like
+ +div#container > p > a[href]where
+ +Y.one('#container').on('mouseover', callback)When the mouse moves over the link, one mouseover event is fired from +#container, then when the mouse moves over the p, another mouseover event is +fired and bubbles to #container, causing a second notification, and finally +when the mouse moves over the link, a third mouseover event is fired and +bubbles to #container for a third notification.
+ +By contrast, using mouseenter instead of mouseover, the callback would be +executed only once when the mouse moves over #container.
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