JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdn.leafletjs.com/leaflet-0.4.5/leaflet.js"></script>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.4.5/leaflet.css">
<b>A Map using Leaflet.js</b>
<div id="mymap" style="width:450px;height:430px;"></div>

CSS

html, body{ width:100%; height: 100%, margin:0; padding:0; }
#mymap{ width:100%; height:100%; }

JavaScript

// create a map
map = new L.Map('mymap');

// create the OpenStreetMap layer
osmTile = "http://tile.openstreetmap.org/{z}/{x}/{y}.png";
osmCopyright = "Map data &copy; 2012 OpenStreetMap contributors";
osmLayer = new L.TileLayer(osmTile, { maxZoom: 18, attribution: osmCopyright } );
map.addLayer(osmLayer);

// set the map's starting view
map.setView( new L.LatLng(22,79), 4 );

// alert on zoom
map.on( "zoomend", function( e ) {
    document.getElementById("mymap").innerHTML = "you zoomed the map!";
});