Reverse event bubbling in javascript

Question

As you know, events usually bubble up in javascript, so the event handler of the element that fires the event is executed first, then the event handler of the parent element is

Answer 1

I can see one huge drawback of your solution is fact, that for every handled event you have to traverse DOM upwards starting with this to establish number of parents.

Traversing in such manner in every event handler = low performance.