Why is this code not working?

Question

https://code.sololearn.com/W4HXs3lj7ixx/#

Answer 1

The same issue as 70% of JS code not working threads in here. This is because your script loads before DOM. To fix this, wrap your entire JS within:

window.onload = function() {
// Your JS here
}

This fixes the problem with null on getContext().

Answer 2

EYOEL ASFAW the source of your image is supposed to be an URL instead of an absolute path to a file in your computer.

You can upload your image to an image hosting site and copy the link to your code.
https://www.sololearn.com/discuss/389765/?ref=app

Answer 3

but it doesn't work