Bug 216066

Summary: [Async overflow scrolling] CSS clip property fails to clip composited descendants of an overflow:scroll
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: CompositingAssignee: Simon Fraser (smfr) <simon.fraser>
Status: NEW ---    
Severity: Normal CC: Hironori.Fujii, simon.fraser, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Testcase none

Description Simon Fraser (smfr) 2020-09-01 21:04:00 PDT
Created attachment 407740 [details]
Testcase

Testcase shows an issue where the 'clip' property fails to clip positioned descendants of composited overflow scroll.
Comment 1 Simon Fraser (smfr) 2020-09-01 21:05:02 PDT
Ancestor clipping stack layers need to look for 'clip'.
Comment 2 Radar WebKit Bug Importer 2020-09-02 20:38:23 PDT
<rdar://problem/68251906>
Comment 3 Fujii Hironori 2022-07-14 19:32:44 PDT
Disabling Async Overflow Scrolling Internal Feature setting of MiniBrowser can work around the issue.