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วาดรูปซ้อนกัน HTML5

<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}

#myCanvas {
border: 1px solid #9C9898;
}
</style>
<script>
window.onload = function()
{
var canvas = document.getElementById(“myCanvas”);
var context = canvas.getContext(“2d”);
context.beginPath();
context.rect(200, 20, 100, 100);
context.fillStyle = “blue”;
context.fill();
context.globalAlpha = 0.5; context.beginPath();
context.arc(320, 120, 60, 0, 2 * Math.PI, false);
context.fillStyle =”red”; context.fill();
};
</script>
</head>
<body>
<canvas id=”myCanvas” width=”578″ height=”200″>
</canvas>
</body>
</html>