Handle transition + animation
Most properties in charts are animatable — clip-path, I'm staring at you.
There shouldn't be any issue with transition handling (on value change, for example, or on intersectionning viewport).
So I think it should be tried :)
Mention to self: in my Paris Web 2020 talk about custom properties (slide 16/19), I implemented transitions on clip-path() for radar charts. So the same is doable with radar charts at least, and maybe line charts too.
As mentionned in #44, we may also trick the eyes by animating backgrounds at some point, since grid-related properties aren't animatable.
I can't make this work on pie charts for now: @property is needed to make a custom property animatable (by specifying its type) but Firefox doesn't support this (for now, announced in Nightly ATM) and switching values in mask-image or clip-path currently doesn't work as intended in Chromium…
To be tried with other chaarts types!
Animate background-position for line and column charts, maybe?