how we resolve the problem

Question

solo learn editor give the error that you dont use the null in getContext while other compiler execute the code and also give the output
const cany=document.getElementById('cani');
const v=cany.getContext('2d');
v.beginPath();
v.fillStyle="green";
v.fillRect(12,5,440,550);
v.clearRect(102,42,127,75)
v.beginPath();
v.fillStyle="purple";
v.moveTo(18,5);
v.lineTo(102,80);
v.lineTo(19,140);
v.fill();
v.clearRect(222,42,139,23)

Answer 1

//You code is working , put all your code inside html inside of js section

https://code.sololearn.com/W6Fl7Ot8mbxu/?ref=app

Answer 2

The reason behind it, the section where you write the JS code loads before the DOM rendered, for dealing with this, write your code inside a script element before the closing element of body or write your code inside the window.onload function like this
window.onload=function(){
//code
}

Answer 3

Ok thanks i will try

Answer 4

Thanks that is executing