Mm, with the value based on `em`, things seem to work perfectly in my example: because we scale the font-size proportionally after laying things once, anything that uses `em` will scale at the same rate, so both the line will continue to fit and the proportions between elements inside the line stay.

I wrote a new article: “Indirect Cyclic Conditions: Prototyping Parametrized CSS Mixins”

kizu.dev/indirect-cyc...

In my quest to push forward what is possible with #CSS, I discovered another application of cyclic dependencies. We are now even closer to something that resembles native CSS mixins.