title: How to setup the Fabric.js?
body: <p>I am very new to fabric.js. I have downloaded the fabric.js, but I don't know how to start it. For example:</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
      &lt;script src="fabric.min.js"&gt;&lt;/script&gt;
  &lt;/head&gt;
  
  &lt;body&gt;
      &lt;canvas id="canvas" width="800" height="450" style="border:1px solid #000000"&gt;&lt;/canvas&gt;
      &lt;script&gt;
          var canvas = new fabric.Canvas('c1');
          canvas.add(new fabric.Circle({ radius: 30, fill: '#f55', top: 100, left: 100 }));
  
          canvas.selectionColor = 'rgba(0,255,0,0.3)';
          canvas.selectionBorderColor = 'red';
          canvas.selectionLineWidth = 5;
      &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>In this script I supposed to see a circle. I followed this example: <a href="http://fabricjs.com/customization/" rel="nofollow">http://fabricjs.com/customization/</a></p>
  
  <p>But why I couldn't see anything; what I am missing?</p>