-1px is not correct why

Answer 1

Pixels for text can never be expressed as a negative of any number.that's why -1px is incorrect.

Answer 2

Negative values in pixels can work on margin or translate.

A text can never be in negative, so it will not work that is obvious.

Answer 3

Well I use pixels as negative and that helps object to translateY to the top like -50 px or -100px otherwise they would stay in center