d3 nested nest from csv data

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<html>
    <head>
        <title>D3 Nested Nest Example</title>
        <script src="https://d3js.org/d3.v2.js"></script>
    </head>
    
    <body>
    
    <script>
    
         d3.csv("./nest2.csv", function(csv_data){
                    
            var nested_data = d3.nest()
                .key(function(d) { return d.region; })
                .key(function(d) { return d.country; })
                .entries(csv_data);
                
            console.debug(nested_data);
            alert(JSON.stringify(nested_data));
     
        });
        
    </script>
    
    </body>
</html>
​
       
    

Modified http://d3js.org/d3.v2.js to a secure url

https://d3js.org/d3.v2.js