D3 Examples - hi to gene?

xxxxxxxxxx
 
<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
        d3.json("data.json", function(error,json){
    d3.select("body").selectAll("p")
        .data(json)
        .enter()
        .append("p")
        .text(function (d) { return d.text; })
    });
      var rectangle = svgContainer.append("rect")
                .attr ("x", function(d){return d.start;})
                .attr ("y", function(d){return 100;})
                .attr ("width", function(d){return d.stop-d.start;})
                .attr ("height", function(d){return 100;})
                .attr ("fill", function(d){
            if (d="forward") return blue;
            else {return purple;}})
    
  </script>
</body>
​
​
    