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<!DOCTYPE html>
<canvas id="c" width="200" height="100"></canvas>
<script>
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
ctx.strokeStyle = 'green';
ctx.lineWidth = '10';
ctx.beginPath();
ctx.moveTo(20, 20);
ctx.lineTo(20, 30);
ctx.closePath();
ctx.stroke();
</script>