Div1 — Demo bubbling (inner event first)
Click somewhere in this box to fire an event attached to div1

Click the button to fire an event attached to the button and then propagate to event attached to div1

Div2 — Demo capturing (outter event first)
Click somewhere in this box to fire an event attached to div2

Click the button to fire an event attached to div2 and then propagate to event attached to the button