D3 Examples - Cleaning chart

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Indices of Multiple Deprivation 2010 Score by Local Authority</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: ;
                font-family: Arial
            }
​
            svg {
                background-color: white;
            }
            
            rect {
                fill: darkorange
            }
            
           h1 {
                color: darkblue
            }
            
            p {
                color: darkslateblue
            }
​
            rect:hover {
                fill: darkblue;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: Arial;
                font-size: 11px;                
            }
​
            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
            
        </style>
    </head>
    <body>
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        <h1>Measuring Deprivation in England</h1>
​
        <p>English indices of multiple deprivation 2010 scores by Local Authority area (higher value = more deprived area)</p>
        <p><em>Source:</em> <a href="https://www.gov.uk/government/statistics/english-indices-of-deprivation-2010">DCLG 2010</a></p>
​
        <script type="text/javascript">     
​
            var w = 700;
            var h = 3500;
            var padding = [ 0, 100, 220, 200 ];  //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] ], 0.5);
​
            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("IMD2010Data-byLA.csv", function(data) {
             //console.log(data);
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                data.sort(function(a, b) {
                    return d3.descending(+a.imdscore, +b.imdscore);
​
                    //If your numeric values aren't sorting properly,
                    //try commenting out the line above, and instead using:
                    //
                    //return d3.descending(+a.lifeSatisfaction, +b.lifeSatisfaction);
                    //
                    //Data coming in from the CSV is saved as strings (text),
                    //so the + signs here force JavaScript to treat those
                    //strings instead as numeric values, thereby fixing the
                    //sort order (hopefully!).
                });
​
​
                widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d.imdscore;
                }) ]);
​
                heightScale.domain(data.map(function(d) { return d.LocalAuthority; } ));
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                     var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.LocalAuthority);
                    })
                    .attr("width", function(d) {
                        return widthScale(d.imdscore);
                    })
                    .attr("height", 8)
                    //.attr("height", heightScale.rangeBand())
                    .attr("fill", "steelblue")
                    .append("title")
                    .text(function(d) {
                        return d.LocalAuthority + " has an IMD 2010 score of " + d.imdscore;
                    });
​
                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>
    