Force-Directed Layout from XML

<!DOCTYPE html>
<style>

.link line {
  stroke: #aaa;
}

.node circle {
  pointer-events: all;
  stroke: none;
  stroke-width: 40px;
}

</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

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

var radius = d3.scaleSqrt()
    .domain([0, 20000])
    .range([0, 20]);

var link = svg.append("g")
    .attr("class", "link")
  .selectAll("line");

var node = svg.append("g")
    .attr("class", "node")
  .selectAll("circle");

var drag = d3.drag()
    .on("start", dragstarted)
    .on("drag", dragged)
    .on("end", dragended);

var simulation = d3.forceSimulation()
    .force("link", d3.forceLink())
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2))
    .on("tick", ticked)
    .stop();

d3.xml("flare.xml", function(error, document) {
  if (error) throw error;

var nodes = d3.select(document).selectAll("*").nodes(),
      links = nodes.slice(1).map(function(d) { return {source: d, target: d.parentNode}; });

link = link.data(links).enter().append("line");

node = node.data(nodes).enter().append("circle")
      .attr("r", function(d) { return radius(d.textContent) || 5; })
      .call(drag);

node.append("title")
      .text(function(d) { return d.tagName; });

simulation.nodes(nodes);
  simulation.force("link").links(links);
  simulation.restart();
});

node
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
}

function dragstarted(d) {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x, d.fy = d.y;
}

function dragged(d) {
  d.fx = d3.event.x, d.fy = d3.event.y;
}

function dragended(d) {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null, d.fy = null;
}

</script>

https://d3js.org/d3.v4.min.js