Use Inkscape shapes in D3.js tree diagram

Use existing svg (e.g. from Inkscape) shapes in D3.js tree diagram.

Sparked by StackOverflow question How do I clone an element or chunk of dom?

<!DOCTYPE html>
<meta charset="utf-8">
<html>
  <head>
    <script src="https://d3js.org/d3.v3.min.js"></script>
    <style>
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<body>
  
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      </g>
    </defs>
  </svg>

// normal tree building stuff taken from a tutorial somewhere
    var treeData = {name: "Switch 1", type: "switch", children : [ 
      {name: "Server 1", type: 'webserver' },
      {name: "Server 2", type: 'webserver' },
      {name: "Server 3", type: 'webserver' } ] 
    };

var vis = d3.select("svg").append("svg:g").attr("transform", "translate(50, 0)")
    var tree = d3.layout.tree().size([300,300]);
    var nodes = tree.nodes(treeData);
    var links = tree.links(nodes);

var diagonalHorizontal = d3.svg.diagonal().projection( function(d) { return [d.y, d.x]; } );
    var link = vis.selectAll(".nodelink")
      .data(links)
      .enter().append("path")
      .attr("class", "nodelink")
      .attr("d", diagonalHorizontal)
      .attr('pointer-events', 'none');

var node = vis.selectAll("g.node")
      .data(nodes)
      .enter().append("g")
      .attr("transform", function(d) { return "translate(" + (d.y-13) + "," + (d.x-10) + ")"; })

// create a reference to the <g> id sections defined in the existing svg markup exported from Inkscape
    node.append("use")
      .attr("xlink:href", function(d) { return "#" + d.type; } )
    
  </script>
</body>
</html>

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

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