Bug 196819

Summary: Misplaced and wrongly clipped position:absolute inside async overflow scroll
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: ScrollingAssignee: Simon Fraser (smfr) <simon.fraser>
Status: NEW ---    
Severity: Normal CC: koivisto, simon.fraser
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Testcase none

Description Simon Fraser (smfr) 2019-04-11 06:56:20 PDT
Created attachment 367218 [details]
Testcase

Some configurations of position:absolute/overflow:hidden inside overflow:scroll trigger bad clipping and movement when scrolling.
Comment 1 Simon Fraser (smfr) 2019-04-11 06:56:41 PDT
Here we need to teach the scrolling tree about ancestor clipping layers.
Comment 2 Simon Fraser (smfr) 2019-04-11 06:57:04 PDT
This affects agoda.com