NEW235904
`scroll-snap-type: x mandatory` jittery 
https://bugs.webkit.org/show_bug.cgi?id=235904
Summary `scroll-snap-type: x mandatory` jittery
Bramus
Reported 2022-01-31 11:23:51 PST
When checking out the MDN demos on https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-snap-type with `scroll-snap-type: x mandatory` selected, it acts a bit jittery when slowish-ly scrolling over the scroll container and then releasing. Just before it snaps, you can see it jump back a little bit. See recording at https://www.youtube.com/watch?v=vLapfq0flMM You can see it really good at the 4 second, where scrolling back from box 3 to box 2. It jumps a little bit back, before snapping.
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Simon Fraser (smfr)
Comment 1 2022-02-02 10:05:12 PST
What Safari are you seeing this with? STP 139?
Bramus
Comment 2 2022-02-02 10:33:07 PST
Seeing this behavior in both of these versions (on macOS 12.1 (21C52)): - Stable: Version 15.2 (17612.3.6.1.6) - STP: Release 139 (Safari 15.4, WebKit 17613.1.14.41.2)
Bramus
Comment 3 2022-02-02 11:23:29 PST
Updated my machine and Safari TP. Seeing the same behavior on the latest macOS 12.2 (21D49) using STP Release 139 (Safari 15.4, WebKit 17613.1.14.41.3)
Radar WebKit Bug Importer
Comment 4 2022-02-07 11:24:19 PST
<rdar://problem/88584478>
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