Map Export

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<!DOCTYPE html>
<html>
  <head>
    <title>Map Export</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>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.3/FileSaver.min.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <a id="export-png" class="btn btn-default"><i class="fa fa-download"></i> Download PNG</a>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import GeoJSON from 'ol/format/GeoJSON.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {OSM, Vector as VectorSource} from 'ol/source.js';

      var map = new Map({
        layers: [
          new TileLayer({
            source: new OSM()
          }),
          new VectorLayer({
            source: new VectorSource({
              url: 'data/geojson/countries.geojson',
              format: new GeoJSON()
            })
          })
        ],
        target: 'map',
        view: new View({
          center: [0, 0],
          zoom: 2
        })
      });

      document.getElementById('export-png').addEventListener('click', function() {
        map.once('rendercomplete', function(event) {
          var canvas = event.context.canvas;
          if (navigator.msSaveBlob) {
            navigator.msSaveBlob(canvas.msToBlob(), 'map.png');
          } else {
            canvas.toBlob(function(blob) {
              saveAs(blob, 'map.png');
            });
          }
        });
        map.renderSync();
      });
    </script>
  </body>
</html>