CORS

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 20px sans-serif;
}
​
h1 {
    color:red;
}
​
h1.success {
    color:green;
}
​
</style>
<body>
<h1>FAILURE</h1>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
d3.json("https://a.tiles.mapbox.com/v3/openstreetmap.map-hn253zqn/geocode/chester%2C%20nj.json",
    function(error, data) {
    if (!error) {
        d3.selectAll('h1').text('success').attr('class', 'success');
    }
});
​
</script>
​
    

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js