To test this, copy the full text of Blackjack.elm in the online compiler. Remove the module Blackjack where line, as the online compiler will throw an error.
Alternatively, install the Elm platform and download Blackjack.elm. On the command line, navigate to wherever the file was saved, and run elm-reactor from that folder. In a browser, go to localhost:8000 and click on the filename (not the wrench). You won't need to remove the module line if you run it through elm-reactor.
Note: this project uses Elm v0.14