Need help in typeof Operator in Javascript

Question

I make a program in JS which will print the type of string
but I get an error
https://code.sololearn.com/W1GrlUM7B9vq/?ref=app

Answer 1

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

Js script gets loaded before html here in sololearn ,so you are accessing a element which doesn't exit yet so hence the innerHTML returns null ,to prevent it windows.onload function let the html Dom get loaded first and then script is executed