addEventListener overwrites other event actions?

Question

Does addEventListener overwrites previously defined actions for a particular event?For example,

Answer 1

No, it does not "overwrite" other handlers; that's why it's called "addEventListener". All the handlers are invoked when an event happens.

Now, I will say that mixing the old-style "DOM 0" event handler attachment mechanism (the "onevent" attributes) with event handlers added with "addEventListener()" is not a very good practice.

Answer 2

No.

From MDC:

addEventListener is the way to register an event listener as specified in W3C DOM. Its benefits are as follows:

• It allows adding more than a single handler for an event.

See example.