Bug 235230

Summary: [macOS] Scrolling webpages is jumpy when flinging on a trackpad
Product: WebKit Reporter: Myles C. Maxfield <mmaxfield>
Component: ScrollingAssignee: Nobody <webkit-unassigned>
Status: RESOLVED MOVED    
Severity: Normal CC: simon.fraser, thorton, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
URL: https://html.spec.whatwg.org
Attachments:
Description Flags
Repro none

Myles C. Maxfield
Reported 2022-01-14 05:47:15 PST
Created attachment 449166 [details] Repro See attached video. From looking at the video frame by frame, it looks like there's one frame where the page doesn't scroll, and then the next frame where it scrolls 2x as far. Qualitatively, it feels pretty uncomfortable to me.
Attachments
Repro (14.55 MB, video/quicktime)
2022-01-14 05:47 PST, Myles C. Maxfield 		no flags
Details
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Myles C. Maxfield
Comment 1 2022-01-14 05:47:41 PST
This is happening on a (very very) recent macOS Monterey with ToT WebKit.
Myles C. Maxfield
Comment 2 2022-01-14 05:52:27 PST
This doesn't happen in AppKit-based apps on the same system. It makes WebKit feel comparatively worse.
Myles C. Maxfield
Comment 3 2022-01-14 05:53:06 PST
Doesn't happen in Chrome.
Radar WebKit Bug Importer
Comment 4 2022-01-14 13:35:58 PST
<rdar://problem/87616361>
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