1 function createCanvas() {
2 var canvas = document.createElement("canvas");
3 canvas.setAttribute("width", 100);
4 canvas.setAttribute("height", 100);
5 var ctx = canvas.getContext("2d");
6 ctx.fillStyle = "rgb(200,0,0)";
7 ctx.fillRect(10, 10, 55, 50);
8 ctx.fillStyle = "rgba(0,0,200,0.5)";
9 ctx.fillRect(30, 30, 55, 50);