Just started playing with the css style "font-variant-numeric: tabular-nums".
It eliminates the flicker around fast changing numbers, at least while the number of digits isn't changing. It basically makes narrow numbers like 1 the same width as wider numbers, without changing the font to a monospace variant. So your game still looks nice, but lines with rapidly changing numbers aren't constantly jumping around.
Applying this manually to the root element of a game can be very helpful. Haven't seen any side effects, but ymmv. Doesn't work, obviously, on most (all?) godot, unreal, etc. graphical / framework based games.
