1124324 - Perform instant and smooth scrolls to maintain guarantees set by scroll snapping CSS attributes when content changes

Status: RESOLVED DUPLICATE of bug 1530253

(Core :: Layout, defect)

Description

[:kip (Kearwood Gilbert)]

When content changes, scroll position must be changed to maintain guarantee of resting on a snap point when scroll-snap-type is set to "mandatory".  For "proximity" scroll snapping, the scroll position must be changed only if the new scroll position is within proximity of a new snap point.

If no snap points are defined within the scrollable range after content changes, no scrolling will be performed.

If, prior to the content change, the scroll snap point has been reached, the scroll position will be updated instantly to match the new position of the same scroll snap point.  If the content change removes the snap point or the prior snap point is no longer reachable within the scrolling range, a smooth scroll will be performed as though the user had completed a scrolling gesture.

If, prior to the content change, the scroll snap point had not been reached, a smooth scroll will be performed as though the user had completed a scrolling gesture.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The bug assignee didn't login in Bugzilla in the last 7 months, so the assignee is being reset.

Comment 2

[Botond Ballo [:botond]]

Is this a duplicate of bug 1530253?

Comment 3

[Hiroyuki Ikezoe (:hiro)]

Yeah, sounds like a completely a dup of bug 1530253. Thanks!