The original repository is a stand-alone game, meaning it does not require a web server to execute, just a browser. You can right-click the index.html file and choose to open it in your favorite browser. You can still do this after registering a service worker and may not notice any differences. But if you open the browser console (F12 Developer Tools), you will most likely see an error.
This error can be attributed to service worker requirements. Service workers, like most new APIs supported by browsers, require HTTPS protocol. This requirement raises the default security level and gives the browsers a minimum level of trust in your site ownership.
The service worker specification relaxes this requirement ...
