v0.40.3

The scroll bar is navigation

It was the last thing still answering to the pointer on its own. With the buttons and the cursor correctly hidden, moving the mouse painted an overlay bar down the edge of the wall — which is what a scroll bar is for, and exactly what should not appear behind a speaker who has stopped touching the mouse. It says where you are and it invites a drag: navigation on both counts.

It now carries the same idle state as the buttons, the dots and the counter, and comes back on the same condition — 250 ms of continuous movement.

It fades rather than being removed: only its colour changes, so a scroll bar that takes layout space keeps its gutter and the page never reflows when the chrome hides or returns. A browser that does not support the property keeps its bar rather than moving the text under it.

Nothing else changes.