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function createCanvas() {
var canvas = document.createElement("canvas");
canvas.setAttribute("width", 100);
canvas.setAttribute("height", 100);
var ctx = canvas.getContext("2d");
ctx.fillStyle = "rgb(200,0,0)";
ctx.fillRect(10, 10, 55, 50);
ctx.fillStyle = "rgba(0,0,200,0.5)";
ctx.fillRect(30, 30, 55, 50);
return canvas;
}