Controls the width of the scrollbar. auto is the platform default, thin is a narrower hint, none hides it entirely (content still scrollable).

Sets the thumb and track colours using border color tokens. The track is transparent by default.

Reserves space for the scrollbar so layout doesn't shift when content becomes scrollable. stable always reserves the gutter; stable both-edges mirrors it on both sides for symmetry.

Clip or scroll on individual axes independently.