Overlay example for leaflet.js v1

An example of using leaflet.js with multiple tile layers and an overlay.

This graph is part of the code samples for the update to the book Leaflet Tips and Tricks to version 1 of leaflet.js.

<!DOCTYPE html>
<html>
<head>
    <title>Simple Leaflet Map</title>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.6.0/dist/leaflet.css"
          integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
          crossorigin=""/></head>
<body>
    <div id="map" style="width: 600px; height: 400px"></div>

var coolPlaces = new L.LayerGroup();

L.marker([-41.29042, 174.78219])
            .bindPopup('Te Papa').addTo(coolPlaces),
        L.marker([-41.29437, 174.78405])
            .bindPopup('Embassy Theatre').addTo(coolPlaces),
        L.marker([-41.2895, 174.77803])
            .bindPopup('Michael Fowler Centre').addTo(coolPlaces),
        L.marker([-41.28313, 174.77736])
            .bindPopup('Leuven Belgin Beer Cafe').addTo(coolPlaces),
        L.polyline([
            [-41.28313, 174.77736],
            [-41.2895, 174.77803],
            [-41.29042, 174.78219],
            [-41.29437, 174.78405]
            ]
            ).addTo(coolPlaces);

var map = L.map('map', {
			    layers: [osmMap] }) // only add one!
          .setView([-41.2858, 174.78682], 14);

var baseLayers = {
			    "OSM Mapnik": osmMap,
			    "Topogrophy": otmMap
		    };

var overlays = {
	        "Interesting places": coolPlaces
      };

L.control.layers(baseLayers,overlays).addTo(map);

</script>
</body>
</html>