D3 Examples - Child poverty by London authority

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  margin: 15px;
  background-color: #F1F3F3    
}
.bar {
    fill: lightblue;
}
 
  .bar:hover {
    fill: orangered;
  }
.axis path,
.axis line {
  fill: none;
  stroke: #D4D8DA;
  stroke-width: 1px;
  shape-rendering: crispEdges;
}
.x path {
    display: none;
}
.toolTip {
    position: absolute;
  display: none;
  min-width: 80px;
  height: auto;
  background: none repeat scroll 0 0 white;
  border: 20px solid "grey";
  padding: 14px;
  text-align: center;
    font-family: sans-serif
}
</style>
​
<svg width="960" height="500"></svg>
​
<script src="https://d3js.org/d3.v4.min.js"></script>
​
<script>
    
var svg = d3.select("svg"),
    margin = {top: 10, right: 100, bottom: 30, left: 150},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;
  
var tooltip = d3.select("body").append("div").attr("class", "toolTip");
  
var x = d3.scaleLinear().range([0, width]);
var y = d3.scaleBand().range([height, 0]);
​
var g = svg.append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
​
d3.csv("Data.csv", function(error, data) {
  if (error) throw error;
  data.forEach(function(d) {
    d.Percent = +d.Percent;
  });
​
  
    x.domain([0, d3.max(data, function(d) { return d.Percent; })]);
    y.domain(data.map(function(d) { return d.Ward; })).padding(0.1);
​
    g.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")");
​
    g.append("g")
        .attr("class", "y axis")
        .call(d3.axisLeft(y));
​
    g.selectAll(".bar")
        .data(data)
      .enter().append("rect")
        .attr("class", "bar")
        .attr("x", 0)
        .attr("height", y.bandwidth())
        .attr("y", function(d) { return y(d.Ward); })
        .attr("width", function(d) { return x(d.Percent); })
        .on("mousemove", function(d){
            tooltip
              .style("left", d3.event.pageX - 50 + "px")
              .style("top", d3.event.pageY - 25 + "px")
              .style("display", "inline-block")
              .html((d.Ward) + "<br>" + (d.Percent) + "%");
        })
            .on("mouseout", function(d){ tooltip.style("display", "none");});
});
</script>
​
    