D3 Examples - Pagespeed Insights test

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
​
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
​
  <link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
  <style>
    body {
      padding: 0;
      margin: 0;
    }
    html, body, #map {
      height: 100%;
      width: 100%;
    }
    </style>
</head>
<body>
  <div id="map"></div>
​
  <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.min.js"></script>
​
  <script>
  (function() {
    var map = L.map('map').setView([40, -97], 5);
​
    L.tileLayer('https://{s}.tile.stamen.com/toner-lite/{z}/{x}/{y}.png', {
      maxZoom: 12,
      attribution: 'Tiles - <a href="https://stamen.com">Stamen Design</a> (<a href="https://creativecommons.org/licenses/by/3.0">CC BY 3.0</a>). Data - <a href="https://openstreetmap.org">OpenStreetMap</a> (<a href="https://www.openstreetmap.org/copyright">ODbL</a>).'
    }).addTo(map);
  })();
  </script>
</body>
</html>
​
    