var map = L.map('map');
  9         var osm = new L.TileLayer("http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
 10                             maxZoom: 18
 11                             });
 12         var london = new L.LatLng(51.505, -0.09); // geographical point (longitude and latitude)
 13         map.setView(london, 13).addLayer(osm);
 14         var marker = L.marker([51.5, -0.09]).addTo(map);
 15         var circle = L.circle([51.508, -0.11], 500, {
 16                     color: 'red',
 17                         fillColor: '#f03',
 18                             fillOpacity: 0.5
 19                             }).addTo(map);
 20         var polygon = L.polygon([
 21                     [51.509, -0.08],
 22                         [51.503, -0.06],
 23                             [51.51, -0.047]
 24                             ]).addTo(map);
 25         marker.bindPopup("<b>Hello world!</b><br>I am a popup.").openPopup();
 26         circle.bindPopup("I am a circle.");
 27         polygon.bindPopup("I am a polygon.");
 28         var popup = L.popup()
 29         .setLatLng([51.5, -0.09])
 30         .setContent("I am a standalone popup.")
 31             .openOn(map);