Does the event object update its properties when the event occurs, or is a new object created?

Question

JavaScript

Imagine that a 'mousemove' handler has been attached to document.
When moving the mouse in the event handler function, is it a new event object each time, or the same object with updated values?

Answer 1

New. Everytime.

Answer 2

And it's weak to create a test example yourself? It will be hard for you to study.
https://jsfiddle.net/0dzmn2op/5/