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<html>
<head>
<title>Leaflet Web Map</title>
<!-- reference to Leaflet CSS -->
<link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
<!-- reference to Leaflet JavaScript -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.min.js"></script>
<!-- set width and height styles for map -->
<style>
#map {
width: 960px;
height:500px;
}
</style>
</head>
<body>
<!-- place holder for map -->
<div id="map"></div>
<script>
//map with WMS layer(s)
var map = L.map('map',{scrollWheelZoom:false}).setView([43.64701, -79.39425], 3);
L.tileLayer('https://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: '© <a href="https://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
var nexrad = L.tileLayer.wms("https://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r.cgi", {
layers: 'nexrad-n0r-900913',
format: 'image/png',
transparent: true,
attribution: "Weather data © 2012 IEM Nexrad"
}).addTo(map);
</script>
</body>
</html>
Modified http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js to a secure url
https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js