D3 Examples - Bar with scale and axes

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
        <title>Average Annual Incomes by Regional District in BC</title>
    <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
    <style type="text/css">
    
      svg{background-color: #818785;}
      
      rect:hover {
        fill: #2BCC14;
      }
​
      .axis path,
      .axis line {
        fill: none;
        stroke: black;
        shape-rendering; crispEdges;
      }
​
      .axis text {
        font-family: sans-serif;
        font-size: 11px;
      }
​
      .y.axis path,
      .y.axis line {
        opacity: 0;
      }
​
    </style>
  </head>
<body>
    <h1>Average Incomes in British Columbia</h1>
​
    <p>Average Annual Incomes by Regional District in BC</p>
 
  <script type="text/javascript">   
​
​
  var w = 900;
  var h = 3200;
  var padding = [20, 20, 30, 210]; //top, right, bottom, left
  
  var widthScale =  d3.scale.linear()
                      .range([ 0, w - padding[1] - 
                        padding[3] ]);
​
  var heightScale = d3.scale.ordinal()
                .rangeRoundBands([ padding[0], h - padding[2] ], 0.1);
​
  var xAxis = d3.svg.axis()
              .scale(widthScale)
              .orient("bottom");
​
  var yAxis = d3.svg.axis()
              .scale(heightScale)
              .orient("left");                    
​
  var svg = d3.select("body")
            .append("svg")
            .attr("width", w)
            .attr("height", h);
​
​
      d3.csv("Core_Housing_Need_data.csv", function(data) {
        data.sort(function(a, b) {
          return d3.descending(+a.Total_all_Average_Household_Income, +b.Total_all_Average_Household_Income);
        });
​
        widthScale.domain([ 0, d3.max(data, function(d) {
          return +d.Total_all_Average_Household_Income;
        }) ]);
​
        heightScale.domain(data.map(function(d) { return d.Geography; } ));
​
        
​
​
​
        var rects = svg.selectAll("rect")
                .data(data)
                .enter()
                .append("rect")
​
              
​
        rects.attr("x", 0)
          .attr("y", function(d, i) {
            return heightScale(d.Geography);
          })
          .attr("width", function(d) {
            return widthScale(d.Total_all_Average_Household_Income);
          })
          .attr("height", heightScale.rangeBand())
          .attr("fill", "#9DFEFF")
          .append("title")
          .text(function(d) {
            return d.Geography + "'s average household income in " + d.Year + " was $" + d.Total_all_Average_Household_Income;
          });
         svg.append("g")
          .attr("class", "x axis")
          .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
          .call(xAxis);
​
        svg.append("g")
          .attr("class", "y axis")
          .attr("transform", "translate(" + padding[3] + ",0)")
          .call(yAxis);     
               
      });
              
          
​
      
​
​
    </script>
</body>
</html>
    