Tile Transitions

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<!DOCTYPE html>
<html>
  <head>
    <title>Tile Transitions</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/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>

  </head>
  <body>
    <div id="map" class="map"></div>
    <label>
      render with an opacity transition
      <input id="transition" type="checkbox" checked>
    </label>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import TileLayer from 'ol/layer/Tile.js';
      import XYZ from 'ol/source/XYZ.js';

      var url = 'https://{a-c}.tiles.mapbox.com/v3/mapbox.world-bright/{z}/{x}/{y}.png';

      var withTransition = new TileLayer({
        source: new XYZ({url: url})
      });

      var withoutTransition = new TileLayer({
        source: new XYZ({url: url, transition: 0}),
        visible: false
      });

      var map = new Map({
        layers: [withTransition, withoutTransition],
        target: 'map',
        view: new View({
          center: [0, 0],
          zoom: 2,
          maxZoom: 11
        })
      });

      document.getElementById('transition').addEventListener('change', function(event) {
        var transition = event.target.checked;
        withTransition.setVisible(transition);
        withoutTransition.setVisible(!transition);
      });
    </script>
  </body>
</html>