npm install && npm start
After a while, you should see text similar to the one in this picture: If you would like to know more about running offline examples, you may take a look at one of our tutorials: Running examples locally
http://localhost:8080/sdk/sprites/sprite
and “Glyphs URL” with http://localhost:8080/sdk/glyphs/{fontstack}/{range}.pbf
Close the overlay to apply the changes by clicking on X in the top right corner.