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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.moveTo(10, 30);↩
ctx.lineTo(50, 50);↩
↩
ctx.stroke();↩
↩
ctx.lineTo(80, 80);↩
ctx.stroke();
</script>
</body>
</html>