For issues relating to setting up, subscribing to, or handling mouseleave events.
A mouseover is an event that occurs on an element when the user moves the cursor over that element
"Imho mouseenter and mouseleave are much more reliable than mouseover and mouseout which tend to flicker"
from question "Creating onmouseover function for separate div"
"Also you might want to use mouseenter and mouseleave which are sanitized by jquery and are a little more reliable than mouseover and mouseout"
from question "Document.getElementById('id') problems"
"In this case mouseenter mouseleave has better behaviour and prevents bubbling compared to mouseover mouseout"
from question "Mouseleave on a container with a select - Internet Explorer 10"
"It should also be noted that mouseenter and mouseleave work somewhat differently and usually much better than mouseover and mouseout"
from question "What is the shorthand for this?"