Area Chart - inversed area

To show an inverse area using area.y0(0);

forked from mbostock's block: Area Chart

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

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var parseTime = d3.timeParse("%d-%b-%y");

var x = d3.scaleTime()
    .rangeRound([0, width]);

var y = d3.scaleLinear()
    .rangeRound([height, 0]);

var area = d3.area()
    .x(function(d) { return x(d.date); })
    .y1(function(d) { return y(d.close); });

d3.tsv("data.tsv", function(d) {
  d.date = parseTime(d.date);
  d.close = +d.close;
  return d;
}, function(error, data) {
  if (error) throw error;

x.domain(d3.extent(data, function(d) { return d.date; }));
  y.domain([0, d3.max(data, function(d) { return d.close; })]);
  
  //CHANGE THIS
  //area.y0(y(0));
  area.y0(0);

g.append("path")
      .datum(data)
      .attr("fill", "steelblue")
      .attr("d", area);

g.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

g.append("g")
      .call(d3.axisLeft(y))
    .append("text")
      .attr("fill", "#000")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", "0.71em")
      .attr("text-anchor", "end")
      .text("Price ($)");
});

</script>

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