projected topojson

<!DOCTYPE html>
<meta charset="utf-8">
    <style>
        html, body {
            margin: 0;
        }
    </style>
    <body>

var color = d3.scale.linear()
                .domain([1, 10])
                .range(["#fee8c8", "#e34a33"]);

var path = d3.geo.path()
                .projection(null);

var svg = d3.select("body")
                .append("svg")
                .attr("width", width)
                .attr("height", height);

d3.json("censustracts-null.json", function(error, topo) {

var censustract = topojson.feature(topo, topo.objects.tl_2014_40_tract)

svg.append("g")
                    .attr("class", "censustracts")
                    .selectAll("path")
                    .data(censustract.features)
                    .enter()
                    .append("path")
                    .attr("class", "censustract")
                    .attr("d", path)
                    .style("fill", function() { return color(Math.floor((Math.random() * 10) + 1)); });
            });

}) ()

</script>

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

Modified http://d3js.org/topojson.v1.min.js to a secure url

https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js

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

https://d3js.org/topojson.v1.min.js