D3 Examples - Trellis Plot D3 new

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<!DOCTYPE html>
​
<html>
<style>
​
.bar {
  fill: orange;
}
​
</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<body>
  <h1>Employed v. UnEmployed Students</h1>
        <p>Graduates Data - Employed v. UnEmployed Students 2015</p>
<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;
​
var x = d3.scaleBand().rangeRound([0, width/2]).padding(0.1),
    y = d3.scaleLinear().rangeRound([height, 0]);
  
var x1 = d3.scaleBand().rangeRound([width/2 +20,width]).padding(0.1);
   
var bs;
var cs;
​
var g =svg.append("g").attr("transform", "translate(" + margin.left + "," +     margin.top + ")");
  
d3.csv("graduates.csv", function(data) {
    return data;
}, 
 
  function(error, data) {
  if (error) throw error;
     bs = data.filter(function(d) {
    return d.Major == "Chemistry";
  })
   
   cs = data.filter(function(d) {
    return d.Major == "Computer Science and Math";
  })
​
  x.domain(bs.map(function(d) { return d.Year; }));
  y.domain([0, (d3.max(cs, function(d) { return +d.Masters; }))]); 
  g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
​
  g.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y))
        
   g.append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 7)
      .attr("dy", "0.71em")
      .attr("text-anchor", "end")
      .text("Masters Student");
​
​
    g.append("g")
    .selectAll(".bar")
    .data(bs)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.Year); })
      .attr("y", function(d) { return y(d.Masters); })
      .attr("width", x.bandwidth())
      .attr("height", function(d) { return height -y(d.Masters); });
  
  x1.domain(cs.map(function(d) { return d.Year; }));
  
  g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x1));
  
  g.append("g")
    .selectAll(".bar")
    .data(cs)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x1(d.Year); })
      .attr("y", function(d) { return y(d.Masters); })
      .attr("width", x.bandwidth())
      .attr("height", function(d) { return height - y(d.Masters); });
 
});
​
</script>
  </body>
</html>
    