This flickers height on mobile, which destroys readability for everything below. Maybe use visibility promise to stabilise when I scroll away

ah havent tried on a small screen, thanks! hmm

Or mono space + fixed precision?

Since arbitrarily fast updates can cause arbitrarily large height changes, it seems hard to solve in general; something like: use `this` to get the previous element, measure its height, and kinda elastically “debounce” any changes. For now I’ve just tweaked the example so the line is shorter and less likely to break on smaller screens.