Some properties like object-position can have a negative percentage basis.
This causes an issue where some browsers calculates/simplifies clamp(100%, 50%, 0%) to 100% ignoring the negative percentage basis, but solves clamp(100%, 50% + 0px, 0%) to 50%. With a percentage basis of -100px the original equation is equal to clamp(-100px, -50px, 0px) which would solve to -50px. Solving the equation without accounting for the negative basis creates unexpected behaviour.
(See https://bugzilla.mozilla.org/show_bug.cgi?id=1709018).
It would be helpful if the spec specified how to handle negative percentage basis in mathematical expressions https://drafts.csswg.org/css-values-4/#calc-func
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