D3 Examples - World Map in D3v4 with Queue and Tooltips

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  background: #fcfcfa;
}
.stroke {
  fill: none;
  stroke: #000;
  stroke-width: 3px;
}
.fill {
  fill: #fff;
}
.graticule {
  fill: none;
  stroke: #777;
  stroke-width: .5px;
  stroke-opacity: .5;
}
.land {
  fill: #222;
}
.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
.tooltip{ 
  background-color:rgba(0,0,0,0.5);
  color:#fff;
  padding: 10px;
  -webkit-border-radius:10px;
  -moz-border-radius:10px;
  border-radius:10px;
}
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/queue.v1.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v1.min.js"></script>
<script src="tooltip.js"></script> 
<script>
​
var width = 960,
    height = 580;
​
var color = d3.scaleOrdinal(d3.schemeCategory10);
​
var projection = d3.geoKavrayskiy7()
    .scale(170)
    .translate([width / 2, height / 2])
    .precision(.1);
​
var path = d3.geoPath().projection(projection);
  
var graticule = d3.geoGraticule();
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
svg.append("defs").append("path")
    .datum({type: "Sphere"})
    .attr("id", "sphere")
    .attr("d", path);
​
svg.append("use")
    .attr("class", "stroke")
    .attr("xlink:href", "#sphere");
​
svg.append("use")
    .attr("class", "fill")
    .attr("xlink:href", "#sphere");
​
svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);
  
//data
//https://github.com/zcreativelabs/react-simple-maps/blob/master/topojson-maps/world-50m.json
//https://github.com/topojson/world-atlas
  
queue()
    .defer(d3.json, "https://cdn.rawgit.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/world-110m.json")
    .defer(d3.tsv, "https://cdn.rawgit.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/world-country-names.tsv")
    .await(ready);
  
function ready(error, world, names) {
  if (error) throw error;  
​
  var countries = topojson.feature(world, world.objects.countries).features,
      neighbors = topojson.neighbors(world.objects.countries.geometries);
 
  //map country names to IDs used on map
  var arr=[];
  names.forEach(function(i){
    arr[i.id]=i.name;
  });
  
  svg.selectAll(".country")
      .data(countries)
    .enter().insert("path", ".graticule")
      .attr("class", "country")
      .attr("d", path)
      .style("fill", function(d, i) { 
        return color(d.color = d3.max(neighbors[i], function(n) { 
          return countries[n].color;
        }) + 1 | 0); 
      })
      .call(d3.helper.tooltip(
        function(d,i){
          return "<b>"+arr[d.id]+ "</b>";
        }
        ));
 
  
 //other tooltips
 /*
 https://labratrevenge.com/d3-tip/
 https://github.com/VACLab/d3-tip
 */
  
  svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("d", path);
};
​
d3.select(self.frameElement).style("height", height + "px");
​
</script>
    