[Webkit-unassigned] [Bug 197744] New: Implement scroll-snap-stop for scroll snapping

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197744

            Bug ID: 197744
           Summary: Implement scroll-snap-stop for scroll snapping
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: majidvp at chromium.org

This property is in scroll snap level 1 specification CR [0]. Please consider implementing this.

We (at Chromium) have implemented this and plan to ship it soon [1]. We have heard from several developers (e.g., See here [2] AirBnb, AMP [3]) that they want this. 
A particular popular usecase is to create full-size image carousels that only snap to the next image (e.g., similar to how native apps do such things) which is the motivation behind  why this feature was added to the spec in the first place. 
Normally a fling gesture snaps to the closest area near its "natural end point" which is not the right behavior in such usecases.

We have added one wpt test for this feature so far as well [4].


[0] https://www.w3.org/TR/css-scroll-snap-1/#scroll-snap-stop
[1] https://chromestatus.com/features/5439846480871424
[2] https://bugs.chromium.org/p/chromium/issues/detail?id=823998#c3
[3] https://bugs.chromium.org/p/chromium/issues/detail?id=920482#c1
[4] https://wpt.fyi/results/css/css-scroll-snap/scroll-snap-stop-always.html?label=master&product=chrome%5Bexperimental%5D&product=edge&product=firefox%5Bexperimental%5D&product=safari%5Bexperimental%5D&aligned&q=scroll-snap

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