[Qwertie]

I'd say the majority of websites were never tested on safari because most small dev places can't afford to buy macbooks just to test one browser.

[codezero]

They could use Sauce labs or some similar very affordable solution.

[Qwertie]

Potentially. Although in my experience safari works 99% the same as chrome so I'd bet a bunch of devs just assume if it works on chrome it will work on safari.