Bug 200888 - Composited overscroll in position: fixed paints wrong
Summary: Composited overscroll in position: fixed paints wrong
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Scrolling (show other bugs)
Version: Safari Technology Preview
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2019-08-19 09:35 PDT by Philip Rogers
Modified: 2019-08-19 10:32 PDT (History)
2 users (show)

See Also:

Attachments
Testcase (325 bytes, text/html)
2019-08-19 09:35 PDT, Philip Rogers 		no flags Details
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Description Philip Rogers 2019-08-19 09:35:11 PDT 
Created attachment 376691 [details]
Testcase

When composited overscrolling in position:fixed, the scroller can repaint incorrectly.

To reproduce:
1) Open the attached testcase.
2) Use the trackpad to scroll the green box down
3) Use the trackpad to fling scroll the green box up
4) While the green box is overscrolled, quickly fling scroll the green box up again.

A screenshot of this bug is available at http://pr.gg/safariscrollbug.png
Comment 1 Radar WebKit Bug Importer 2019-08-19 10:32:46 PDT 
<rdar://problem/54472544>