Bug 238616 - [iOS] WebKit misreports scroll position in requestAnimationFrame
Summary: [iOS] WebKit misreports scroll position in requestAnimationFrame
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Scrolling (show other bugs)
Version: WebKit Local Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2022-03-31 10:50 PDT by Brent Fulgham
Modified: 2023-01-17 15:48 PST (History)
6 users (show)

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Description Brent Fulgham 2022-03-31 10:50:09 PDT 
Converted from a codepen.io test case:

// iOS misreports scroll position! Set it, check it immediately and it's correct but then 
// on the next requestAnimationFrame (or sometimes in the same one), it REVERTS to the previous scroll position!!!

You must run this on iOS Safari in the /debug/ window of CodePen so that it's not in an iframe https://codepen.io/GreenSock/debug/16c435b12ef09c38125204818e7b45fc?editors=0010
Comment 1 Radar WebKit Bug Importer 2022-03-31 10:50:41 PDT 
<rdar://problem/91113529>
Comment 2 Simon Fraser (smfr) 2023-01-17 15:48:41 PST 
<rdar://88342742>