Why wont my program run correctly in Code Playground. What am i missing?

Question

i decided that i should learn a new language. so im trying out javaScript. i made a program and it runs fine on my local host, however when i put it in here, it does not display anything.
i uploaded my index.html and my "main.js" to the respective spots on Code Playground. am i not supposed to have setup() or draw()?
how can i include more scripts on Code Playground?
what is the js file name to reference to in CP, or does it just know automatically?
what do i Need for a file to render correctly in the CP?
--any feedback is helpful feedback :D

Answer 1

that because you have to make a html canvas which has the same size, on the computer the editor does that on its own

Answer 2

you don't have a canvas! p5.js needs it

Answer 3

I wrote "createCanvas (400,400)"....
like I said it works on my comouter but not in the Code Playground.... :/

Answer 4

I wrote "createCanvas (400,400)"....
like I said it works on my comouter but not in the Code Playground.... :/