Error message to fix

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Adding Tooltips</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", 300)
						.attr("height", 400);

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

data.sort(function(a, b) {
					return d3.descending(+a.forestarea2012km2, +b.forestarea2012km2);

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

rects.attr("x", 0)
					.attr("y", function(d, i) {
						return i * 10;
					})
					.attr("width", function(d) {
						return d.forestarea2012km2 * 30;
					})
					.attr("height", 8)
					.append("title")
					.text(function(d) {
						return d.country + "'s life satisfaction score is " + d.forestarea2012km2;
					});

});

</script>

</body>
</html>

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

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