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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>HTML5 Canvas Test</title>
  <script type="text/javascript" src="canvas_game.js"></script>
  <link rel="stylesheet" type="text/css" href="style.css" >
</head>
<body>
  <div id="holder">
    <canvas id="game">
    </canvas>
  </div>
</body>
</html>


// JavaScript Document
var canvas = document.getElementById('game');
var context = canvas.getContext('2d');

context.fillRect(20,20,100,100);