What's the difference between event.stopPropagation and event.preventDefault?

Question

They seem to be doing the same thing...
Is one modern and one old? Or are they supported by different browsers?

When I handle events myself (without framework) I

Answer 1

event.preventDefault(); Stops the default action of an element from happening.

event.stopPropagation(); Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event.

For example, if there is a link with a click method attached inside of a DIV or FORM that also has a click method attached, it will prevent the DIV or FORM click method from firing.