Bug 259343

Summary: Fixed element inside sticky container inside element with overflow-y: auto is being partially hidden
Product: WebKit Reporter: JC Franco <jc.dafko>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: ahmad.saleem792, bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Mac (Apple Silicon)   
OS: macOS 13   
Attachments:
Description Flags
Repro cases showing fixed-positioned child with a sticky-positioned parent not escaping scrolling/clipping container none

Description JC Franco 2023-07-19 10:58:57 PDT 
Created attachment 467074 [details]
Repro cases showing fixed-positioned child with a sticky-positioned parent not escaping scrolling/clipping container

Ported from https://bugzilla.mozilla.org/show_bug.cgi?id=1571330

Repro case: https://codepen.io/jcfranco/pen/XWyYJRW
Comment 1 Radar WebKit Bug Importer 2023-07-19 13:38:36 PDT 
<rdar://problem/112552011>
Comment 2 Ahmad Saleem 2023-07-19 14:34:40 PDT 
I am able to reproduce this on WebKit ToT (266165@main) as well.