JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://nvd3.org/assets/js/nv.d3.js"></script>
<link rel="stylesheet" href="http://nvd3.org/assets/css/nv.d3.css">
<svg id="test1" class="mypiechart"></svg>

CSS

.mypiechart {
  width: 500px;
  border: 2px;
}

JavaScript

var testdata = [
    {
      key: "eight two%",
      y: 82
    },
    {
      key: "eighteen%",
      y: 18
    }

  ];


nv.addGraph(function() {
    var width = 500,
        height = 500;

    var chart = nv.models.pieChart()
        .x(function(d) { return d.key })
        .y(function(d) { return d.y })
        .color(['red','green'])
        .width(width)
        .height(height);

      d3.select("#test1")
          .datum(testdata)
        .transition().duration(1200)
          .attr('width', width)
          .attr('height', height)
          .call(chart);


    var svg = d3.select("#test1");

    svg
            .append('defs')
            .append('pattern')
            .attr('id', 'diagonalHatch')
            .attr('patternUnits', 'userSpaceOnUse')
            .attr('width', 4)
            .attr('height', 4)
            .append('path')
            .attr('d', 'M-1,1 l2,-2 M0,4 l4,-4 M3,5 l2,-2')
            .attr('stroke', '#000000')
            .attr('stroke-width', 1);

    return chart;
});
var svg2 = d3.select("#test1");
  var node = svg2.select(".nv-slice path").attr('d');
  console.log(node);