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<html>
<head>
<meta charset=utf-8 />
<title>Modest Maps JS Demo | Two Maps</title>
<link rel='stylesheet' href='style.css'>
</head>
<body onload='initMap()'>
<div id='container'>
<div id='left-map'></div>
<div id='right-map'></div>
</div>
<script src='https://cdn.jsdelivr.net/gh/stamen/modestmaps-js/modestmaps.min.js'></script>
<script src='app.js'></script>
</body>
</html>
Updated missing url https://raw.github.com/stamen/modestmaps-js/master/modestmaps.min.js to https://cdn.jsdelivr.net/gh/stamen/modestmaps-js/modestmaps.min.js
https://raw.github.com/stamen/modestmaps-js/master/modestmaps.min.js