ss these predictions. This method invokes a callback you provide every few milliseconds to provide the current gaze location of a user. If you don't need constant access to this data stream, you may alternatively call <code class="javascript">webgazer.getCurrentPrediction()</code> which will give you a prediction at the moment when it is called.
                    </p>

                    <pre><code class="javascript hljs">
webgazer.setGazeListener(function(data, elapsedTime) {
    if (data == null) {
   