How to create a button using JavaScript any JavaScript alone

Question

Please someone to explain.

Answer 1

Begin with learning to use createElement()

https://developer.mozilla.org/en-US/docs/Web/API/Document/createElement

Answer 2

onload=()=>{
let button =document.createElement('button');
button.textContent='button';
document.body.appendChild(button);
button.onclick=()=>{alert("pressed")}
}