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<html lang="en">
<!--https://blog.webkid.io/maps-with-leaflet-and-topojson/-->
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="EU map: leaflet">
<meta name="keywords" content="openness">
<meta name="author" content="Michal Škop">
<!-- <link type="image/x-icon" href="/images/favicon.ico" rel="shortcut icon">-->
<link href="//maxcdn.bootstrapcdn.com/bootswatch/3.3.5/superhero/bootstrap.min.css" rel="stylesheet">
<link href="//netdna.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" rel="stylesheet">
<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
<!-- <script src="//netdna.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js">-->
<title>EU map</title>
<link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css">
</head>
<body>
<style>
#worldmap{
background: white;
height: 100%;
width: 100%;
}
#worldmap-container {
width: 100%;
height: 550px;
border: 1px solid #CCC;
}
</style>
<script>
countries = {};
</script>
<div class="container">
<!-- Page Content -->
<!-- map and categories -->
<div class="row">
<div class="col-lg-3"></div>
<div class="col-lg-6">
<div id="worldmap-container">
<div id="worldmap"></div>
</div>
</div>
</div>
<!-- map js -->
<script src="//cdn.bootcss.com/chroma-js/1.1.1/chroma.min.js"></script>
<script src="//cdn.bootcss.com/topojson/1.6.19/topojson.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.3/leaflet.min.js"></script>
<script src="//cdn.bootcss.com/d3/3.5.6/d3.min.js"></script>
<script src="map.js"></script>
</div>
</body>
</html>
Modified http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js to a secure url
https://code.jquery.com/jquery-1.11.3.min.js
https://netdna.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js
https://cdn.bootcss.com/chroma-js/1.1.1/chroma.min.js
https://cdn.bootcss.com/topojson/1.6.19/topojson.min.js
https://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js
https://cdn.bootcss.com/d3/3.5.6/d3.min.js