Leaflet.markercluster

<!DOCTYPE html>
<html>
<head>
    <title>Leaflet debug page -> https://github.com/Leaflet/Leaflet.markercluster</title>

    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.3/dist/leaflet.css" integrity="sha512-07I2e+7D8p6he1SIM+1twR5TIrhUQn9+I6yjqD53JQjFiMf8EtC93ty0/5vJTZGF8aAocvHYNEDJajGdNx1IsQ==" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.0.3/dist/leaflet-src.js" integrity="sha512-WXoSHqw/t26DszhdMhOXOkI7qCiv5QWXhH9R7CgvgZMHz1ImlkVQ3uNsiQKu5wwbbxtPzFXd1hK4tzno2VqhpA==" crossorigin=""></script>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <link rel="stylesheet" href="mobile.css" />

    <link rel="stylesheet" href="../dist/MarkerCluster.css" />
    <link rel="stylesheet" href="../dist/MarkerCluster.Default.css" />
    <script src="../dist/leaflet.markercluster-src.js"></script>
    <script src="realworld.388.js"></script>
</head>
<body>

    <div id="map"></div>

    <script type="text/javascript">

        var tiles = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
                maxZoom: 18,
                attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors, Points &copy 2012 LINZ'
            }),
            latlng = L.latLng(-37.821, 175.22);

        var map = L.map('map', {center: latlng, zoom: 15, layers: [tiles]});

        var markers = L.markerClusterGroup();

        for (var i = 0; i < addressPoints.length; i++) {
            var a = addressPoints[i];
            var title = a[2];
            var marker = L.marker(L.latLng(a[0], a[1]), { title: title });
            marker.bindPopup(title);
            markers.addLayer(marker);
        }

        map.addLayer(markers);

    </script>
</body>
</html>