On: Signs that a startup is focused on stuff that does...

[tonyplee]

Have you tried add OAuth support to your web app?

After with, do your team do automated regressive tests the oauth support and all other functionalities on all the regular browsers and mobile browsers?

+ Older version browsers?

+ Older browsers in older version of Linux, Mac, Windows?

+ Browsers with plugins such umatix, unblock origin, noscript that blocks scripts from your own domains + other domains?

[vectorpush → tonyplee]

I'm not really sure what your point is. If OAuth integration is a requirement for your project then its your responsibility to test it across the platforms you intend to support and that's a universal truth no matter what development stack you're working with.