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<html>
<head>
<title>Leaflet Squirrel - Step 1</title>
<link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.min.js"></script>
<style>
#map{ height: 100% }
</style>
</head>
<body>
<div id="map"></div>
<script>
// initialize the map centered on the geographic center of the lower 48
var map = L.map('map').setView([39.833, -98.35], 4);
// load tile layer from mapstack we copied earlier and use the required attribution
L.tileLayer(
'https://{s}.sm.mapstack.stamen.com/((naip,$fff[difference],$fff[@60],$fff[hsl-saturation@90])[multiply],(mapbox-water,$fff[difference],$000[@60],$090d11[hsl-color]))/{z}/{x}/{y}.png', {
attribution: 'Map tiles by <a href=”https://stamen.com”>Stamen Design</a>, under <a href=”https://creativecommons.org/licenses/by/3.0”>CC BY 3.0</a>. Data by <a href=”https://openstreetmap.org”>OpenStreetMap</a>, under <a href=”https://creativecommons.org/licenses/by-sa/3.0”>CC BY SA</a>',
// we want to limit the scrollability
maxZoom: 19,
minZoom: 4
}).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