<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, sans-serif;
}
svg {
background-color: steelblue;
}
path {
fill: green;
stroke: #fff;
stroke-width: .5px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
height = 960;
var projection = d3.geo.mercator()
.scale(width / 2 / Math.PI)
.translate([width / 2, height / 2])
.precision(.1);
var path = d3.geo.path()
.projection(projection);
var graticule = d3.geo.graticule();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("countries.json", function(world) {
var countries = topojson.feature(world, world.objects.countries).features;
svg.selectAll(".country")
.data(countries)
.enter().insert("path")
.attr("class", "country")
.attr("d", path);
});
d3.select(self.frameElement).style("height", height + "px");
</script>
</body>