<code class="javascript">webgazer</code> are <code class="javascript">webgazer.begin()</code> and <code class="javascript">webgazer.setGazeListener()</code>. <code class="javascript">webgazer.begin()</code> starts the data collection that enables the predictions, so it's important to call this early on. Once <code class="javascript">webgazer.begin()</code> has been called, WebGazer.js is ready to start giving predictions. <code class="javascript">webgazer.setGazeListener()</code> is a convenient way to acce