How much is thirteen to twenty-seven?

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<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>How much is thirteen to twenty-seven?</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
		<style type="text/css">
			
			body {
				background-color: white;
				font-family: Verdana;
			}

svg {
				background-color: white;
			}

circle {
				fill: rgb(60, 161, 189);
			}

circle:hover { 
				fill: rgb(33, 93, 109);
			}

text {
				fill: black;
			}

.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}

</style>
	</head>
	<body>

<h2>How much is thirteen to twenty-seven?</h2>
		<p>This dataset gives an insight about the mathematics skills of boys and girls across 37 OECD countries. Each circle represent a country, placed according to boys' score on y axis and girls' score on x axis. </p>

var w = 500
			var h = 500

var padding = [ 50, 50, 50, 50 ];  //Top, right, bottom, left

var xScale = d3.scale.linear()
							.range ([ 0, w - padding[1] - padding[3] ]);

var yScale = d3.scale.linear()
							.range ([ 0, h - padding[0] - padding[2] ]);

var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.ticks(15);

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left")
							.ticks(15);

var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

d3.csv("OECD_ISA_2012.csv", function(data) {

data.sort(function(a,b){
					return d3.ascending (a.mathGirls, b.mathGirls);
				})

xScale.domain([ 
					d3.min(data, function(d) {
						return +d.mathGirls;
					}), 
					d3.max(data, function(d) {
						return +d.mathBoys;
					})
				]);

yScale.domain([
					d3.max(data, function(d) {
						return +d.mathBoys;
					}),
					d3.min(data, function(d) {
						return +d.mathGirls;
					})
				]);

svg.append("line")
				.attr("x1", padding[3])
				.attr("y1", (h - padding[2]))
				.attr("x2", (w - padding[1])) 
				.attr("y2", padding[0])
				.attr("stroke", "black")
				.attr("stroke-width","1");

svg.append("text")
				.attr("x", (padding[3] + 20))
				.attr("y", (padding[0] + 12))
				.attr("text-anchor", "start")
				.attr("font-size", 12)
				.text("Boys performed better")

svg.append("text")
				.attr("x", (w - padding[1]))
				.attr("y", (h - padding[2] - 20))
				.attr("text-anchor", "end")
				.attr("font-size", 12)
				.text("Girls performed better")

svg.append("g")
				.attr("class", "x axis")
				.attr("transform", "translate(" + (padding[3]) + "," + (h - padding[0]) + ")")
				.call(xAxis);

svg.append("g")
				.attr("class", "y axis")
				.attr("transform", "translate(" + (padding[3]) + ", " + (padding[0]) + ")")
				.call(yAxis);

var circles = svg.selectAll("circle")
					.data(data)
					.enter()
					.append("circle")

circles.attr("cx", function(d){
						return xScale(d.mathGirls)+padding[3];
					})
					.attr("cy", function(d, i){
						return yScale(d.mathBoys)+padding[2];
					})
					.attr("r", 4)
					.append("title")
					.text(function(d){
						return d.country+": girls scored "+d.mathGirls+" points ; boys scored "+d.mathBoys+" points"
					});

// var labels = svg.selectAll("text")
			// 		.data(data)
			// 		.enter()
			// 		.append("text")

// 	labels.attr("x", 10)
			// 		.attr("y", function(d, i){
			// 			return i * heightScale.rangeBand()+heightScale.rangeBand()*0.7;
			// 		})
			// 		.attr("font-size", function(d){
			// 			return heightScale.rangeBand()*0.7;
			// 		})
			// 		.text(function(d){
			// 			return d.country;
			// 		})

});

</script>

</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js