CSS #unfunfact: You can only divide by numbers in calc(). calc(5px / 1px) is invalid, not 5 as you might expect. w3.org/TR/css-values/#calc-t…

Because division by 0 is bad, but we can't tell if calc(1px/(16px - 1em)) is invalid until late.

So a whole class of use cases has been ruled out due to division by 0? Why not just make invalid at computed value time?

It's planned to do that in the future. Just a lot of added complication (have to track units) for first level of calc().

And that concept was introduced by variables, didn't exist when calc was written. 😀

Cool, I suspected that might have been the case! Looking forward to values 4 then :)