Drawing rectangles

<html>
<body onload="draw()">
<canvas id="canvas" width="300" height="300"></canvas>
<script type="application/x-javascript">
function draw() {
 var canvas = document.getElementById("canvas");
 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);
}
</script>
</body>
</html>