Why i am not able to use addEventListener

Question

Error
https://code.sololearn.com/W7sNh0NXq4lB/?ref=app

Answer 1

Js script is getting loaded before html so obviously getting the element that doesn't exist yet returns null ,to avoid this use

window.onload=function(){
js code goes here
}

Also search for similar questions pls, you will get many more ways and much detailed answers ,it has been asked many times,

Answer 2

Thanks brother

Answer 3

Thanks bro

Answer 4

This happen only in sololearn?