By manually reviewing the said file or by trusting a central authority of some sort.
3 karma · joined June 6, 2017
Or something like email, you could have foo@whatsapp.com or foo@telegram.org and that would be your 'chat address' and all clients could talk to each other
If I need to see the password for some reason you can find it from browser settings.
One Advantage I can think of of running such analysis on GitHub would be automatically analyzing pull requests.
Implementing that .btn-spin yourself wouldn't be too hard either, couple lines of CSS...