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<!doctype html>
<head>
<style>
body {
background-color: blue;
}
</style>
<body>
<canvas id="mycanvas" width="200" height="200"></canvas>
<script type="text/javascript">
var cx = document.getElementById('mycanvas').getContext('2d');
cx.beginPath();
cx.arc(100, 100, 80, 0, Math.PI*2, true);
cx.closePath();
cx.fillStyle = "white";
cx.fill();
</script>