map not working

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Map of Spain</title>
		<script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
		<style type="text/css">

body {
				margin: 0;
				background-color: lightGray;
				font-family: Helvetica, Arial, sans-serif;
			}

#container {
				width: 700px;
				margin-left: auto;
				margin-right: auto;
				margin-top: 50px;
				padding: 50px;
				background-color: white;
				box-shadow: 3px 3px 5px 6px #ccc;
			}

h1 {
				font-size: 24px;
				margin: 0;
			}

p {
				font-size: 14px;
				margin: 15px 0 10px 0;
			}

a:link {
				text-decoration: none;
				color: gray;
			}

a:hover {
				text-decoration: underline;
			}

a:visited {
				color: gray;
			}

a:active {
				color: steelBlue;
			}

svg {
				background-color: white;
			}

</style>
	</head>
	<body>

<h1>Spanish provinces</h1>

//Width and height
			var w = 700;
			var h = 500;

//Define map projection
      var projection = d3.geo.mercator()
								   .translate([ w/2, h/2 ])
								   .scale([ 30000]);

//Define path generator
			var path = d3.geo.path()
							 .projection(projection);

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

//Load in GeoJSON data
			d3.json("provincias.json", function(json) {

//Bind data and create one path per GeoJSON feature
				svg.selectAll("path")
				   .data(json.features)
				   .enter()
				   .append("path")
				   .attr("d", path);

});

</script>
	</body>
</html>

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