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Drawing rectangles
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<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>