[css-overflow] scrollLeft and scrollTop as CSS properties?

[ByteEater-pl]

Why aren't scrollLeft and scrollTop CSS properties? They're about presentation in interactive visual media, so it seems appropriate. And declarative animation with CSS would be possible, in a way that's uniform (and often needs to be combined) with other properties, without resorting to requestAnimationFrame, as currently (and that only for a few years; there was no good, widely implemented way before).

[tabatkins]

Because they're controlled directly by the user. This would put them, at best, in the same awkward spot that resize is, where it has to reflect the user's actions by writing them into inline style, which will usually win in the cascade.

Affecting the initial scroll position is a different thing, and generally fine - see the 'scroll-start' property proposal.