Debugging d3-geo projection.fitSize

Note: this won't work because the us-10m.json is already projected to US Albers.

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/topojson.v2.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .chart {
      margin: 10px;
    }
  </style>
</head>

<body>
  <svg width="320" height="200"></svg>
  <script>
    var svg = d3.select('svg'),
        width = +svg.attr('width'),
        height = +svg.attr('height');
   
    d3.json('us-10m.topojson', function(error, us) {
      if (error) throw error;
      
      // convert our topojson to geojson
      var states = topojson.feature(us, us.objects.states);

// projection fn so we can fit geodata within svg's area
      var projection = d3.geoAlbersUsa().fitSize([width, height], states);
      
      // use projection fn with geoPath fn
      var path = d3.geoPath().projection(projection);
      
      var svg = d3.select('body').append('svg')
      	.attr('width', width)
        .attr('height', height)
        .attr('class', 'chart');
      
      svg.append("g")
      		.attr("class", "states")
      	.selectAll("path")
        .data(states.features)
        .enter().append("path")
          .attr("d", path)
      		.attr('fill', '#fff')
      		.attr('stroke', '#333');
    });
  </script>
</body>

https://d3js.org/d3.v4.min.js

https://d3js.org/topojson.v2.min.js