Not by themselves, at least today, as we can't currently modify the value of a custom property by using itself in the calculation. But in the future we will have an `inherit()` functional notation that will unlock this (and at least Chrome implemented it in Canary already — https://blog.kizu.dev/play-with-inherit-function/).
It is possible to use style queries and some hacks (https://kizu.dev/self-modifying-variables/) to achieve this today, but that doesn't bring this closer to production, as Firefox still does not support them (but will be soon).
It is possible to use style queries and some hacks (https://kizu.dev/self-modifying-variables/) to achieve this today, but that doesn't bring this closer to production, as Firefox still does not support them (but will be soon).