    <h3>Click the buttons to change the zoom level or just use the normal
    click-and drag. While zoom typically works by click-and-drag, the
    buttons are useful for testing.</h3>
    <h4>Window coordinates (in dates and values):</h4>
    <div id="xdimensions"></div> <div id="ydimensions"></div>
    <div style="float: right">
        <p>Zoomed: <span id="zoomed">False</span><p/>
        <p>Zoomed X: <span id="zoomedX">False</span><p/>
        <p>Zoomed Y: <span id="zoomedY">False</span><p/>
    </div>
