text: var map = L.map('map').setView([51.505, -0.09], 13);
  
  L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
      attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
  }).addTo(map);
  
  L.marker([51.5, -0.09]).addTo(map)
      .bindPopup('A pretty CSS3 popup.<br> Easily customizable.')
      .openPopup();