[qwerty1793]

That may have been the case in 2011 when that article was written, but I have just tested this now and my facebook does not accept my password with the case reversed by having the caps lock key on.

[josalhor]

They may have changed it, but it was certainly working in 2017: https://news.ycombinator.com/item?id=13426544

[scoopr]

iirc, on mac capslock works like (caps OR shift) and on windows its (caps XOR shift), that is, on mac, with capslock on its always cap, but on windows its just a toggle.