Need help in code, not able to see createElement in the output

access to bootplay ground - https://codedamn.com/playground/7nhnh09piyXJmQcMcI1TD

JS code below const buttons = document.querySelector('#btn');

buttons.onClick = () => { const h3 = document.createElement('h1'); h1.innerText = "This is magic";

// buttons.prepend(h1) // buttons.appendChild(h1) document.body.appendChild(h1) }