Hi, Why should l get an error Undefined Timerinr in my code?

Question

https://code.sololearn.com/WlOhBIkPFYxq/?ref=app
https://code.sololearn.com/WlOhBIkPFYxq/?ref=app

Answer 1

Js script getting executed before loading of HTML Dom,you need to put all your js code in the following function
window.onload=function(){

}
Now js runs only after document is loaded

Answer 2

That's because the js part wasn't run when it was executed. And their was no Timerinr.
https://code.sololearn.com/WqCN1AlKkknG/?ref=app