[unemployable]

>If you want to get deeper into it, have a look at event bubbling and propagation.

In this example, the event is on the Window. There is no bubbling. It is already at the top level.

>Believe me, you don’t want to use the standard event handling API without a framework. Adding, deleting, cloning, firing, removing, fire once etc on many elements can have serious unwanted side effects.

I don't know what this means. The frameworks do not have much to do with this topic.

[pquki4]

I think the previous comment discusses events in a general sense.

Frameworks batch changes so that updates are efficient, and in many cases figures out the "correct" order of doing things. If you do all of those yourself in a large and complex UI, very likely you are updating the DOM less efficiently than what frameworks are doing, and very likely you introduced some subtle bugs. Speaking of that from my first-hand experience.