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<html>
<body>
<canvas id="mycanvas">
Your browser does not support the canvas element.
</canvas>
<script>
var canvaselm = document.getElementById("mycanvas").getContext("2d");
canvaselm.fillStyle = "#bb00bb";
canvaselm.fillRect(20,100,300,50);
canvaselm.stroke();
</script>
</body>
</html>