This is a very, very simple Leaflet Example, for Maptime Amsterdam.
http://maptime-ams.github.io/simple-leaflet-example
Clone, fork, or download this repository, and open index.html in your favorite browser, or start a HTTP server in the directory where index.html is in:
$ python -m SimpleHTTPServer
More information about Leaflet:
If you've created a map with Mapbox Studio, you can use mapbox.html instead, and replace the mapId and accessToken variables with your own.