Rather it is a bug that properties that accept lengths allow a literal zero—a design bug that won’t be fixed for compatibility reasons, but which strongly shoul

Rather it is a bug that properties that accept lengths allow a literal zero—a design bug that won’t be fixed for compatibility reasons, but which strongly should not be propagated into new work. This is why not even `padding: calc(0)` works. CSS is typed. Every other context requires units, and computed values always have a unit.