mouseenter vs mouseover

Difference

The mouseenter and mouseover events are triggered when you move the mouse over an element.
mouseenter only triggers when the mouse enters the element on which it is set. The counterpart event is mouseleave.
mouseover triggers when the mouse enters the element or any of its children. Its counterpart is mouseout.
mouseenter: The number is increased by 1 when you are over the biggest square only
0
mouseover: The number is increased by 1 when you are over any square
0

Good practice

Because the mouseover event propagates from the child element up through the hierarchy, if you're doing a resource-intensive task on the event you may notice the screen flickering.
It's recommended to use the mouseenter and mouseleave events instead.
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