Overlaying an image map type

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JavaScript
function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 18,
    center: {lat: 37.783, lng: -122.403}
  });

  var bounds = {
    17: [[20969, 20970], [50657, 50658]],
    18: [[41939, 41940], [101315, 101317]],
    19: [[83878, 83881], [202631, 202634]],
    20: [[167757, 167763], [405263, 405269]]
  };

  var imageMapType = new google.maps.ImageMapType({
    getTileUrl: function(coord, zoom) {
      if (zoom < 17 || zoom > 20 ||
          bounds[zoom][0][0] > coord.x || coord.x > bounds[zoom][0][1] ||
          bounds[zoom][1][0] > coord.y || coord.y > bounds[zoom][1][1]) {
        return null;
      }

      return ['http://www.gstatic.com/io2010maps/tiles/5/L2_',
          zoom, '_', coord.x, '_', coord.y, '.png'].join('');
    },
    tileSize: new google.maps.Size(256, 256)
  });

  map.overlayMapTypes.push(imageMapType);
}
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Overlaying an image map type</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 18,
    center: {lat: 37.783, lng: -122.403}
  });

  var bounds = {
    17: [[20969, 20970], [50657, 50658]],
    18: [[41939, 41940], [101315, 101317]],
    19: [[83878, 83881], [202631, 202634]],
    20: [[167757, 167763], [405263, 405269]]
  };

  var imageMapType = new google.maps.ImageMapType({
    getTileUrl: function(coord, zoom) {
      if (zoom < 17 || zoom > 20 ||
          bounds[zoom][0][0] > coord.x || coord.x > bounds[zoom][0][1] ||
          bounds[zoom][1][0] > coord.y || coord.y > bounds[zoom][1][1]) {
        return null;
      }

      return ['http://www.gstatic.com/io2010maps/tiles/5/L2_',
          zoom, '_', coord.x, '_', coord.y, '.png'].join('');
    },
    tileSize: new google.maps.Size(256, 256)
  });

  map.overlayMapTypes.push(imageMapType);
}

    </script>
    <script async defer
        src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&signed_in=true&callback=initMap"></script>
  </body>
</html>

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