title: How to to make the canvas scrollable to contain multiple pages scanned pdf?
body: <p>I'm beginner to HTML5.</p>
  
  <p>I use the <a href="http://www.codicode.com/art/how_to_draw_on_a_html5_canvas_with_a_mouse.aspx" rel="nofollow">Canvas</a> to draw on it and i want to get the following abilities :</p>
  
  <hr>
  
  <ol>
  <li><p>Allowing the canvas to be Expandable so if the image was set of <code>scanned pdfs</code>, i can show all the images (pdf pages).</p></li>
  <li><p>I want the (Undo &amp; Redo ) Functionality through the canvas .</p></li>
  </ol>