const ctx = canvas.getContext('2d');

canvas.width = canvas.height = 200;

ctx.fillStyle = 'steelblue';

ctx.fillRect(0, 0, 200, 200);

ctx.fillStyle = 'plum';

ctx.fillRect(10, 10, 150, 100);

​

​

let canvasRef;

function setup() {

  createCanvas(400, 400);

  canvasRef = select('#canvas')

}

​

function draw() {

  background(220);

  image(canvasRef, mouseX, mouseY)

}