window.onload = setup2d;
function setup2d() {
const canvas = document.getElementById("my-canvas");
const context = canvas.getContext("2d");
context.fillStyle = "rgb(200,0,0)";
context.fillRect(10,10,100,100);
context.fillStyle = "rgb(0,200,0)";
context.fillRect(20,20,100,100);
context.fillStyle = "rgb(0,0,200)";
context.fillRect(30,30,100,100);
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