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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<p><canvas width="100" height="100" id="c"></canvas></p>
<script type="text/javascript">
var c = document.getElementById('c').getContext('2d');
c.shadowColor = '#f00';
c.shadowBlur = 4;
c.lineWidth = 2;
c.moveTo(80, 40);
c.lineTo(50, 70);
c.lineTo(20, 40);
c.lineTo(50, 10);
c.closePath();
c.stroke();
</script>
</body>
</html>