//select the canvas
// https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API
var canvas = document.querySelector('canvas');
//get the drawing context
var ctx = canvas.getContext('2d');
var X = 0;
function update(dt){
//Clear:
ctx.clearRect(0, 0, canvas.width, canvas.height);
//Draw square
ctx.fillStyle = "rgb(200,0,0)";
ctx.arc(100,75,50,0,2*Math.PI);
ctx.fill()
X+=1;
//Make it loop
window.requestAnimationFrame(update);
}
update()