jQuery mouseover() vs mouseenter() example

mouseover() - no child element
OuterBox
#mouseover is fired : 0
mouseenter() - no child element
OuterBox
#mouseenter is fired : 0
mouseover() - with child elements
OuterBox
InnerBox
#mouseover outer is fired : 0
#mouseover inner is fired : 0
mouseenter() - with child elements
OuterBox
InnerBox
#mouseenter outer is fired : 0
#mouseenter inner is fired : 0