leafletの使い方

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>test</title>
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.0/dist/leaflet.css" />
  <script src="https://unpkg.com/leaflet@1.3.0/dist/leaflet.js"></script>
  <script>
    function init() {
      var map = L.map('mapcontainer');
      map.setView([-1.091176, 37.011073], 15,);
      L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png').addTo(map);
    }
  </script>
</head>
<body onload="init()">
  <div id="mapcontainer" style="width:600px;height:600px"></div>
</body>
</html>