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<!DOCTYPE html>
<html>
<body>
<canvas id="canvas" width="100" height="100"></canvas>
<script>
var c = document.getElementById("canvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.globalCompositeOperation = "copy";
ctx.fillStyle = "green";
ctx.fillRect(0, 0, 50, 50);
</script>
</body>
</html>
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