EPSG:4326

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<!DOCTYPE html>
<html>
  <head>
    <title>EPSG:4326</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>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import {defaults as defaultControls, ScaleLine} from 'ol/control.js';
      import TileLayer from 'ol/layer/Tile.js';
      import TileWMS from 'ol/source/TileWMS.js';


      var layers = [
        new TileLayer({
          source: new TileWMS({
            url: 'https://ahocevar.com/geoserver/wms',
            params: {
              'LAYERS': 'ne:NE1_HR_LC_SR_W_DR',
              'TILED': true
            }
          })
        })
      ];

      var map = new Map({
        controls: defaultControls().extend([
          new ScaleLine({
            units: 'degrees'
          })
        ]),
        layers: layers,
        target: 'map',
        view: new View({
          projection: 'EPSG:4326',
          center: [0, 0],
          zoom: 2
        })
      });
    </script>
  </body>
</html>