D3 Examples - Lots of points in Mapbox Basemap

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<!DOCTYPE html>
<html>
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<head>
  <meta charset='utf-8' />
  <title></title>
  <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
  <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.15.0/mapbox-gl.js'></script>
  <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.15.0/mapbox-gl.css' rel='stylesheet' />
  <link href='https://fonts.googleapis.com/css?family=Ropa+Sans' rel='stylesheet' type='text/css'>
  <style>
    body {
      margin: 0;
      padding: 0;
    }
​
    #map {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 100%;
    }
  </style>
</head>
​
<body>
​
  <style>
    #title {
      position: absolute;
      top: 72%;
      left: 1%;
      bottom: 0;
      width: 450px;
      height: 160px;
      box-sizing: border-box;
      border-color: rgba(65, 73, 80, 0.9);
      border-width: medium;
      border-style: solid;
      padding: 8px 24px;
      font-family: 'Ropa Sans', sans-serif;
      font-size: 9pt;
      color: rgba(229, 229, 216, 0.9);
      text-align: center;
      background: rgba(42, 54, 60, 0.9);
      -webkit-border-radius: 4px;
      border-radius: 4px;
      z-index: 9999;
      overflow: auto;
    }
​
    a {
      color: rgba(229, 229, 216, 0.9);
    }
  </style>
  <div id='map'></div>
  <script>
    mapboxgl.accessToken = 'pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA';
    var map = new mapboxgl.Map({
      container: 'map',
      style: 'mapbox://styles/jonahadkins/cim3kbhey0091cwm21d1dvsgo',
      center: [-73.990173, 40.726966],
      pitch: 40.5, // pitch in degrees
      bearing: -27.396674584323023, // bearing in degrees
      zoom: 7, // starting zoom
      minZoom: 1,
      maxZoom: 17,
      altitude: 1.5
    });
​
    // Add Button Control
    var layerList = document.getElementById('title');
    var inputs = layerList.getElementsByTagName('input');
​
    function switchLayer(layer) {
      var layerId = layer.target.id;
      map.setStyle(layerId);
    }
​
    for (var i = 0; i < inputs.length; i++) {
      inputs[i].onclick = switchLayer;
    }
    // Add zoom and rotation controls to the map.
    map.addControl(new mapboxgl.Navigation());
  </script>
  
</body>
​
</html>
​
    