Here you will find an HTML template for the geo-viz workshop. We'll be adding javascript code to the section between the opening and closing <script></script> tags in the index.html file. There are already some variables there to help us get started with.
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https://d3js.org/d3.v4.min.js
https://api.tiles.mapbox.com/mapbox-gl-js/v0.43.0/mapbox-gl.js