Bug 209737

Summary:	Repaint issue in fixed header inside iframe
Product:	WebKit	Reporter:	Frédéric Wang (:fredw) <fred.wang>
Component:	Scrolling	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Major	CC:	ap, cathiechen, dvoytenko, fred.wang, jridgewell, simon.fraser, webkit-bug-importer, webkit-unassigned
Priority:	P2	Keywords:	InRadar
Version:	Safari 13
Hardware:	iPhone / iPad
OS:	iOS 13
Bug Depends on:	209486
Bug Blocks:

Description Frédéric Wang (:fredw) 2020-03-30 07:01:02 PDT

+++ This bug was initially created as a clone of Bug #209486 +++

Repro page: https://output.jsbin.com/wakuqok/quiet

It's a simple page that overflows on x and y. When scrolled, it shows a very visible flicker.

See screen recording: https://drive.google.com/file/d/1g7IQE25VOS2B5Bhg760_Qx7k0Bnrrqbp/view?usp=sharing

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Note: Justin said "I had paint flashing enabled when recording, if you're referring to the red flashes."