How to connect JavaScript with my HTML code

Question

Hello, I'm new here and a newbie so please help :) Thanks :*
I'm trying to code a little snake game in web but when I want to getElementById in order to use my canvas, JavaScript keep saying me that, It can't use getContext on a null type object which mean getElementById returns me an empty array, I think. So, is there a solution ? Do I have to "links" my JavaScript code with my HTML and if so, how ? I don't ask before because I was thinking that Sololearn auto-linked me. Thanks for help ♥️

Answer 1

Try using the script tag

Answer 2

Works if i use the script tag in my HMTL page but I would like to know why I can't use my Java page :/ Thanks

Answer 3

Please need some help !

In the script tag, my code works perfectly fine, but it doesn't in my JS window...

It keeps saying me : Cannot read property "getContent" of null...

Help please