Reddit Treemap

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}

form {
  position: absolute;
  right: 10px;
  top: 10px;
}

.node {
  border: solid 1px white;
  font: 10px sans-serif;
  color: #fff;
  line-height: 12px;
  overflow: hidden;
  position: absolute;
  text-indent: 2px;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 4, right: 4, bottom: 4, left: 4},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var color = d3.scale.category20c();

var treemap = d3.layout.treemap()
    .size([width, height])
    .sticky(true)
    .padding(2)
    .children(function(d, depth) { return d.values; })
    .value(function(d) { return 1; });

var div = d3.select("body").append("div")
    .style("position", "relative")
    .style("width", (width + margin.left + margin.right) + "px")
    .style("height", (height + margin.top + margin.bottom) + "px")
    .style("left", margin.left + "px")
    .style("top", margin.top + "px");

d3.json("https://www.reddit.com/.json?limit=100", function(error, raw) {
  var data = raw.data.children.map(function(d) { return d.data; });
  console.log("data", data);

var root = d3.nest()
    .key(function(d) { return "root"; })
    .key(function(d) { return d.subreddit; })
    .entries(data)[0];
  console.log("root", root);
  console.log("treemap", treemap.nodes(root));

var node = div.datum(root).selectAll(".node")
      .data(treemap.nodes)
    .enter().append("div")
      .attr("class", "node")
      .call(position)
      .style("background", function(d) { return d.values ? null : "steelblue"; })
      .text(function(d) { return d.values ? null : d.subreddit; });
});

</script>

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

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