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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 c = 30;

context.fillStyle = "rgba(255,127,0,0.5)"
for (var i =1; i<=10; i++) {
  context.fillRect(i*(c-c/2),i*(c-c/2),c,c);
}
</script>


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

var c = 30;

context.fillStyle = "rgba(255,127,0,0.5)"
for (var i =1; i<=10; i++) {
  context.fillRect(i*(c-c/2),i*(c-c/2),c,c);
}</script></body>
</html>