test

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Tree Species Distribution per Hectare, by Decile, for Four American Cities</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<style type="text/css">
			
			body {
				background-color: #ddddff;
			}

svg {
				background-color: white;
			}

</style>
	</head>
    <body>

var svg = d3.select("body")
						.append("svg")
						.attr("width", 900)
						.attr("height", 180);

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

data.sort(function(a, b) {
					return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);

//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!).
				});

var rect = svg.selectAll("rect")
								.data(data)
								.enter()
								.append("rect");

rect.attr("x", 0)
					.attr("y", function(d, i) {
						return i * 18;
					})
					.attr("width", function(d) {
						return d.TREESperhectare * 8;
					})
					.attr("height", 16)
					.append("title")
					.text(function(d) {
						return "For Philadelphia, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
					});

});
            
            
            var svg2 = d3.select("body")
						.append("svg")
						.attr("width", 900)
						.attr("height", 180);

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

data.sort(function(a, b) {
					return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);

var rect2 = svg2.selectAll("rect")
								.data(data)
								.enter()
								.append("rect");

rect2.attr("x", 0)
					.attr("y", function(d, i) {
						return i * 18;
					})
					.attr("width", function(d) {
						return d.TREESperhectare * 8;
					})
					.attr("height", 16)
					.append("title")
					.text(function(d) {
						return "For Chicago, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
					});

});
            
             var svg3 = d3.select("body")
						.append("svg")
						.attr("width", 900)
						.attr("height", 180);

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

data.sort(function(a, b) {
					return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);

var rect3 = svg3.selectAll("rect")
								.data(data)
								.enter()
								.append("rect");

rect3.attr("x", 0)
					.attr("y", function(d, i) {
						return i * 18;
					})
					.attr("width", function(d) {
						return d.TREESperhectare * 8;
					})
					.attr("height", 16)
					.append("title")
					.text(function(d) {
						return "For Kansas City, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
					});

});
            
             var svg4 = d3.select("body")
						.append("svg")
						.attr("width", 900)
						.attr("height", 180);

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

data.sort(function(a, b) {
					return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);

var rect4 = svg4.selectAll("rect")
								.data(data)
								.enter()
								.append("rect");

rect4.attr("x", 0)
					.attr("y", function(d, i) {
						return i * 18;
					})
					.attr("width", function(d) {
						return d.TREESperhectare * 8;
					})
					.attr("height", 16)
					.append("title")
					.text(function(d) {
						return "For Minneapolis, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
					});

});
        </script>
    </body>
</html>

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

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