D3 Examples - Drop multiple geojson files on a mapbox gl js map

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<!DOCTYPE html>
<html>
  <head>
    <meta charset='utf-8' />
    <title>Drop geojson</title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <meta http-equiv="cache-control" content="Public">
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.23.0/mapbox-gl.css' rel='stylesheet' />
    <link href='progress.css' rel='stylesheet' />
    <link href='app.css' rel='stylesheet' />
  </head>
  <body>
    <div id='map'></div>
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.23.0/mapbox-gl.js'></script>
    <script src='helpers.js'></script>
    <script src='app.js'></script>
  </body>
</html>
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