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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<p><canvas width="500" height="200" id="c"></canvas></p>
<script type="text/javascript">
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.lineWidth = 20;
ctx.strokeStyle = 'rgb(0,0,0)';
ctx.save();
ctx.moveTo(10, 30);
ctx.lineTo(50, 50);
ctx.stroke();
ctx.restore();
ctx.lineTo(80, 80);
ctx.stroke();
</script>
</body>
</html>
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