 the very capable <a target="_blank" href="http://ace.ajax.org/">ACE editor</a>. The server serves static HTML, CSS and JavaScript code only, none of that is dynamically generated on the server. Instead, to create behaviour, the main traffic between server and client consists of the JSON responses from the server guiding the transformation of the browser's DOM on the client side.
                  </p>
                  <h4 id="source_code">Source code</h4>
                  <p>
                     The sou