This video discusses the differences between two pairs of mouse events for a moving mouse: mouseover and mouseout versus mouseenter and mouseleave.
Both mouseover and mouseout events have "target" and "related target" properties. Suppose a cursor moves from element A to element B. In considering the mouseover event, A is the related target while B is the target. However, in considering the mouseout event, A is the target while B is the related target.
For mouseover and mouseout events, the events that happen on the descendants would bubble up.
The mouseover and mouseout events can skip elements when the cursor moves quickly.
For the mouseenter and mouseleave events, bubbling would not be considered.
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