View difference between Paste ID: s81DE9FK and sr2Z6sVR

     <!DOCTYPE html>
     <meta charset="utf-8">
     <style>
 
 
     .node {
       cursor: pointer;
     }
 
     .node:hover {
       stroke: #000;
       stroke-width: 1.5px;
     }
 
     .node--leaf {
       fill: white;
     }
 
     .label {
       font: 0px "Helvetica Neue", Helvetica, Arial, sans-serif;
       text-anchor: middle;
       text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff, 0 -1px 0 #fff;
     }
 
     .label,
     .node--root,
     .node--leaf {
       pointer-events: none;
     }
 
     </style>
     <!-- <body> -->
     <p>Twitter</p>
     <svg width="960" height="960"></svg>
     <script src="https://d3js.org/d3.v4.min.js"></script>
     <script>
 
     var svg2 = d3.select("svg"),
         margin = 20,
         diameter = +svg2.attr("width"),
         g = svg2.append("g").attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");
 
     var color = d3.scaleLinear()
         .domain([-1, 5])
         .range(["hsl(152,80%,80%)", "hsl(228,30%,40%)"])
         .interpolate(d3.interpolateHcl);
 
     var pack = d3.pack()
         .size([diameter - margin, diameter - margin])
         .padding(2);
 
     d3.json("data1.json", function(error, root) {
       if (error) throw error;
 
       root = d3.hierarchy(root)
           .sum(function(d) { return d.size; })
           .sort(function(a, b) { return b.value - a.value; });
 
       var focus = root,
           nodes = pack(root).descendants(),
           view;
 
       var circle = g.selectAll("circle")
         .data(nodes)
         .enter().append("circle")
           .attr("class", function(d) { return d.parent ? d.children ? "node" : "node node--leaf" : "node node--root"; })
           .style("fill", function(d) { return d.children ? color(d.depth) : null; })
           .on("click", function(d) { if (focus !== d) zoom(d), d3.event.stopPropagation(); });
 
       var text = g.selectAll("text")
         .data(nodes)
         .enter().append("text")
           .attr("class", "label")
           .style("fill-opacity", function(d) { return d.parent === root ? 1 : 0; })
           .style("display", function(d) { return d.parent === root ? "inline" : "none"; })
           .text(function(d) { return d.data.name; });
 
       var node = g.selectAll("circle,text");
 
       svg2
           .style("background", color(-1))
           .on("click", function() { zoom(root); });
 
       zoomTo([root.x, root.y, root.r * 2 + margin]);
 
       function zoom(d) {
         var focus0 = focus; focus = d;
 
         var transition = d3.transition()
             .duration(d3.event.altKey ? 7500 : 750)
             .tween("zoom", function(d) {
               var i = d3.interpolateZoom(view, [focus.x, focus.y, focus.r * 2 + margin]);
               return function(t) { zoomTo(i(t)); };
             });
 
         transition.selectAll("text")
           .filter(function(d) { return d.parent === focus || this.style.display === "inline"; })
             .style("fill-opacity", function(d) { return d.parent === focus ? 1 : 0; })
             .on("start", function(d) { if (d.parent === focus) this.style.display = "inline"; })
             .on("end", function(d) { if (d.parent !== focus) this.style.display = "none"; });
       }
 
       function zoomTo(v) {
         var k = diameter / v[2]; view = v;
         node.attr("transform", function(d) { return "translate(" + (d.x - v[0]) * k + "," + (d.y - v[1]) * k + ")"; });
         circle.attr("r", function(d) { return d.r * k; });
       }
     });
 
 
 var svg = d3.select("svg"),
     margin = 20,
     diameter = +svg.attr("width"),
     g = svg.append("g").attr("transform", "translate(" + diameter / 2 + "," + diameter / 2 + ")");
 
 var color = d3.scaleLinear()
     .domain([-1, 5])
     .range(["hsl(152,80%,80%)", "hsl(228,30%,40%)"])
     .interpolate(d3.interpolateHcl);
 
 var pack = d3.pack()
     .size([diameter - margin, diameter - margin])
     .padding(2);
 
 d3.json("data2.json", function(error, root) {
   if (error) throw error;
 
   root = d3.hierarchy(root)
       .sum(function(d) { return d.size; })
       .sort(function(a, b) { return b.value - a.value; });
 
   var focus = root,
       nodes = pack(root).descendants(),
       view;
 
   var circle = g.selectAll("circle")
     .data(nodes)
     .enter().append("circle")
       .attr("class", function(d) { return d.parent ? d.children ? "node" : "node node--leaf" : "node node--root"; })
       .style("fill", function(d) { return d.children ? color(d.depth) : null; })
       .on("click", function(d) { if (focus !== d) zoom(d), d3.event.stopPropagation(); });
 
   var text = g.selectAll("text")
     .data(nodes)
     .enter().append("text")
       .attr("class", "label")
       .style("fill-opacity", function(d) { return d.parent === root ? 1 : 0; })
       .style("display", function(d) { return d.parent === root ? "inline" : "none"; })
       .text(function(d) { return d.data.name; });
 
   var node = g.selectAll("circle,text");
 
   svg
       .style("background", color(-1))
       .on("click", function() { zoom(root); });
 
   zoomTo([root.x, root.y, root.r * 2 + margin]);
 
   function zoom(d) {
     var focus0 = focus; focus = d;
 
     var transition = d3.transition()
         .duration(d3.event.altKey ? 7500 : 750)
         .tween("zoom", function(d) {
           var i = d3.interpolateZoom(view, [focus.x, focus.y, focus.r * 2 + margin]);
           return function(t) { zoomTo(i(t)); };
         });
 
     transition.selectAll("text")
       .filter(function(d) { return d.parent === focus || this.style.display === "inline"; })
         .style("fill-opacity", function(d) { return d.parent === focus ? 1 : 0; })
         .on("start", function(d) { if (d.parent === focus) this.style.display = "inline"; })
         .on("end", function(d) { if (d.parent !== focus) this.style.display = "none"; });
   }
 
   function zoomTo(v) {
     var k = diameter / v[2]; view = v;
     node.attr("transform", function(d) { return "translate(" + (d.x - v[0]) * k + "," + (d.y - v[1]) * k + ")"; });
     circle.attr("r", function(d) { return d.r * k; });
   }
 });
     </script>