D3 Examples - Simple bar graph in v4

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
body {
      margin:0;
      position:fixed;
      top:0;
      right:0;
      bottom:0;
      left:0;
    }
.bar { fill: steelblue;
  }
.bar:hover {
      fill: brown;
    }
​
    .label {
      fill: black;
      font: 10px sans-serif;
      text-anchor: middle;
    }
</style>
<body>
    
<!-- load the d3.js library -->     
<script src="//d3js.org/d3.v4.min.js"></script>
​
  <script>
​
// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
// set the ranges
var x = d3.scaleBand()
          .range([0, width])
          .padding(0.05);
var y = d3.scaleLinear()
          .range([height, 0]);
    var xAxis = d3.axisBottom(x);
​
    var yAxis = d3.axisLeft(y)
        .ticks(10, "%");
          
// append the svg object to the body of the page
// append a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", 
          "translate(" + margin.left + "," + margin.top + ")");
​
// get the data
  var url = "https://raw.githubusercontent.com/MTClass/Project/master/CountyPop.csv"
  
d3.csv(url, function(error, data) {
  if (error) throw error;
​
  // format the data
  data.forEach(function(d) {
    d.Pop = +d.Pop;
  });
​
  // Scale the range of the data in the domains
  x.domain(data.map(function(d) { return d.County; }));
  y.domain([0, d3.max(data, function(d) { return d.Pop; })]);
​
  // append the rectangles for the bar chart
  svg.selectAll(".bar")
      .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.County); })
      .attr("width", x.bandwidth())
      .attr("y", function(d) { return y(d.Pop); })
      .attr("height", function(d) { return height - y(d.Pop); });
​
  // add the x Axis
  svg.append("g")
  
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
  
 
    
​
  
  // add the y Axis
  svg.append("g")
      .call(d3.axisLeft(y));
​
});
​
</script>
</body>
​
    