Full Screen Control with extended source element

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<!DOCTYPE html>
<html>
  <head>
    <title>Full Screen Control with extended source element</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
    <style>
      .fullscreen:-moz-full-screen {
        height: 100%;
      }
      .fullscreen:-webkit-full-screen {
        height: 100%;
      }
      .fullscreen:-ms-fullscreen {
        height: 100%;
      }

      .fullscreen:fullscreen {
        height: 100%;
      }

      .fullscreen {
        margin-bottom: 10px;
        width: 100%;
        height: 400px;
      }

      .ol-rotate {
        top: 3em;
      }

      .map {
        width: 80%;
        height: 100%;
        float: left;
      }

      .sidepanel {
        background: #1F6B75;
        width: 20%;
        height: 100%;
        float: left;
      }

      .sidepanel-title {
        width: 100%;
        font-size: 3em;
        color: #ffffff;
        display: block;
        text-align: center;
      }
    </style>
  </head>
  <body>
    <div id="fullscreen" class="fullscreen">
      <div id="map" class="map"></div>
      <div class="sidepanel">
        <span class="sidepanel-title">Side Panel</span>
      </div>
    </div>

    <script>
      var view = new ol.View({
        center: [-9101767, 2822912],
        zoom: 14
      });

      var map = new ol.Map({
        controls: ol.control.defaults().extend([
          new ol.control.FullScreen({
            source: 'fullscreen'
          })
        ]),
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: view
      });
    </script>
  </body>
</html>