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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
canvas {
border: 1px solid #ccc
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
var can = document.getElementById("canvas");
can.width = 800;
can.height = 600;
var ctx = can.getContext("2d");
<!--ctx.beginPath();-->
ctx.rect(50, 50, 100, 100);
<!--ctx.fillStyle = "#00cc00";-->
<!--ctx.fill();-->
ctx.strokeStyle = "#cc0000";
ctx.stroke();
ctx.beginPath();
ctx.rect(200, 50, 100, 100);
ctx.strokeStyle = "#00cc00";
ctx.stroke();
ctx.beginPath();
ctx.moveTo(600, 100);
ctx.lineTo(650, 150);
ctx.lineTo(550, 150);
<!--ctx.lineTo(600, 100);-->
ctx.closePath();
ctx.lineWidth = 10;
ctx.strokeStyle = '#0000cc';
ctx.stroke();
</script>
</body>
<!--<script src="main.js"></script>-->
</html>
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