UI Events example: add dividers!?

The example box with the faces in [Events mouseover/mouseout, relatedTarget](https://javascript.info/mousemove-mouseover-mouseout-mouseenter-mouseleave#events-mouseover-mouseout-relatedtarget) would be more clear with dividers added in the textarea between actions once some seconds passed - just like in the other examples (e.g. [Skipping elements](https://javascript.info/mousemove-mouseover-mouseout-mouseenter-mouseleave#skipping-elements))

Open the linked “Events mouseover/mouseout, relatedTarget” example and compare its textarea behavior with the linked “Skipping elements” example. Add dividers between actions after some seconds have passed; done when the faces example clearly separates those actions like the comparison example.

Written by the indexing model from the issue text.