D3 Examples - leaflet basemap example

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 <!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>A basic map with Leaflet</title>
    
    <!--add Leaflet CSS-->
     <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css"
      integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ=="
      crossorigin=""/>
    
    <!--our own style rules-->
    <style type="text/css">
      body, html {
        height: 90%;
      }
      #map-container {
        height: 100%;
      }
    </style>
  </head>
  <body>
    
    <!--The div in which the map will be created-->
    <div id="map-container"></div>
    
    <!--load leaflet.js-->
    <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"
    integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw=="
    crossorigin=""></script>
    
    <!--our own code to create the map-->
    <script>
      let map = L.map('map-container');
      map.setView([52.268, 4.998], 7);
​
      let bglayer_Positron = L.tileLayer('https://cartodb-basemaps-{s}.global.ssl.fastly.net/light_all/{z}/{x}/{y}.png', {
        attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> &copy; <a href="https://cartodb.com/attributions">CartoDB</a>',
        subdomains: 'abcd',
        maxZoom: 19
      });
      
      bglayer_Positron.addTo(map);
    </script>
  </body>
</html>
​
    