Need help/advise

Question

Hello, I coded this JavaScript game.
The game itself is just a proof/test to show that it works.
The idea is to put (almost) all the code in a separate file so that it can be used as some kind of library.
Will this work, if not how do I make it work.
and
What should I add?

https://code.sololearn.com/WBqcz6KCUP55/?ref=app

Answer 1

It should work if you make 3 different files:
1)JS_Game.html
2 )JS_Game.css
3)JS_Game.js
//Without a single mistake