Bar Chart Test v2

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.js"></script>
  <style>
    .axis path,
    .axis line {
      fill: black
        ;
      stroke: #000;
      shape-rendering: crispEdges;
    }

.bar {
      fill: steelblue;
    }
    .bar:hover{fill: green;}
   body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
	<script>
    
    var letters = [
      {letter: "A", frequency: "0.08167"},
      {letter: "B", frequency: "0.07167"},
      {letter: "C", frequency: "0.06167"},
      {letter: "D", frequency: "0.05167"},
      {letter: "E", frequency: "0.04167"},
      {letter: "F", frequency: "0.03167"},
      {letter: "G", frequency: "0.02167"}
      ];

var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    
    
	var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], 0.1, 0.2);

var y = d3.scale.linear()
    .range([height, 0]);
    
	var svg = d3.select("body").append("svg")
  	.attr("width",width + margin.left +margin.right)
  	.attr("height",height + margin.top +margin.bottom)
  
  var g = svg.append("g")
  	.attr("transform","translate("+margin.left+","+margin.top+")");

x.domain(letters.map(function(d) {return d.letter}));  
	y.domain([0, d3.max(letters, function(d) { return d.frequency; })]);

g.append("g")
  	.attr("class","x axis")
  	.attr("transform","translate(0,"+height+")")
		.call(d3.svg.axis().scale(x).orient("bottom"));
    
    
	g.append("g")
  	.attr("class","y axis")
  	.attr("transform","translate(0,"+0+")")
		.call(d3.svg.axis().scale(y).orient("left"));
    
 g.selectAll(".bar")
 	.data(letters)
 	.enter().append("rect")
 	.attr("class","bar")
  .attr("x",function(d) {return x(d.letter);})
 	.attr("width",x.rangeBand())
 	.attr("y",function(d) {return y(d.frequency);})
//  .attr("height", function(d){return height});
  .attr("height", function(d) {return height-y(d.frequency);});
  
    
	</script>
</body>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.js