Your use case

What would you like to do?

I would like to be able to drag the font slider between different values.

Why would you like to do it?

Because it looks like a slider so that was the first thing I tried. But it only selected the text below it

(This was in Element web on Firefox 95 for reference)

Have you considered any alternatives?

One could also make that Element not look like a slider.

Additional context

This was in Element web on Firefox 95 for reference. Maybe this is actually a bug, but I think it wasn't ever implemented, so I filed this as an ER.