>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.