D3 Examples - Woods and trees and all that. My final submission for Exercise 5

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<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Exercise 5</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
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            h1 {
                font-size: 24px;
                margin: 0;
            }
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            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
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            svg {
                background-color: white;
            }
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            circle:hover {
                fill: orange;
            }   
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            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
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            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
        
        </style>
    </head>
    <body>
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        <h1>RSPB Big Garden Bird Watch Results 2015</h1>
        <p>The Royal Society for the Protection of Birds (RSPB) is a conservation charity based in the UK.</p>
        <p>The Big Garden Bird Watch is the world's biggest citizen based wildlife survey.</p>
        <p>Over the course of one weekend over half a million people spent an hour observing the number and different types of bird species in their backgarden.</p>
        <p>This scatter plot shows the mean number of species spotted at any one time against the percentage of gardens in which they were spotted in.</p> 
        <p>Source: <a = href="https://www.rspb.org.uk/discoverandenjoynature/discoverandlearn/birdwatch/results.aspx">RSPB</a>, 2015</p>
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        <script type="text/javascript"> 
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            var w = 500;
            var h = 500;
            var padding = [ 30, 0, 30, 40 ]  //Top, right, bottom, left
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​
​
            var xScale = d3.scale.linear()
                                .range([ padding[3], w - padding[1] - padding[3] ]);
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            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2] ]);
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​
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            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom");
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            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left")
                            .tickFormat(function(d){
                                return d + "%";
                            });
                            
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
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​
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            d3.csv("RSPB_BigGardenBirdWatch_UK_2015.csv", function(data) {
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                data.sort(function(a, b) {
                    return d3.descending(+a.Percentage_Gardens, +b.Percentage_Gardens);
                });
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                xScale.domain([ 
                    d3.min(data, function(d) {
                    return +d.Mean; 
                    }), 
                    d3.max(data, function(d) {
                    return +d.Mean; 
                    }) 
                ]);
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                yScale.domain([ 
                    d3.max(data, function(d) {
                        return +d.Percentage_Gardens;   
                    }),
                    d3.min(data, function(d) {
                        return +d.Percentage_Gardens;   
                    }),
                ]);
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                var circles = svg.selectAll("circle")
                                .data(data)
                                .enter()
                                .append("circle");
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                circles.attr("cx", function(d) {
                        return xScale(d.Mean);
                    })
                    .attr("cy", function(d) {
                        return yScale(d.Percentage_Gardens);
                    })
                    .attr("r", 5)
                    .attr("fill", "steelblue")
                    .append("title")
                    .text(function(d) {
                        return "A mean number of " + d.Mean + " " +d.Species+ "'s were spotted in " + d.Percentage_Gardens + "% of gardens.";
                    });
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                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2]) + ")")
                    .call(xAxis);
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                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
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            });
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        </script>
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    </body>
</html>
    