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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Practice JavaScript by drawing</title>
</head>
<body>
  <canvas id="myCanvas" height="300" width="450" style="border: 1px solid black"></canvas>
<script id="jsbin-javascript">
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');

var canvasWidth = 100;
var canvasHeight = 100;

var recttop = 340;
var recright = 190;

context.fillStyle = 'red';
context.fillRect(recttop,recright,canvasWidth,canvasHeight);
context.fillStyle = 'blue';
context.fillRect(recttop+10,recright+10,canvasWidth,canvasHeight);
</script>


<script id="jsbin-source-javascript" type="text/javascript">var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');

var canvasWidth = 100;
var canvasHeight = 100;

var recttop = 340;
var recright = 190;

context.fillStyle = 'red';
context.fillRect(recttop,recright,canvasWidth,canvasHeight);
context.fillStyle = 'blue';
context.fillRect(recttop+10,recright+10,canvasWidth,canvasHeight);
</script></body>
</html>