[Webkit-unassigned] [Bug 209486] New: Very noticeable flickering in a scrolling iframe with horizontal overflow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209486

            Bug ID: 209486
           Summary: Very noticeable flickering in a scrolling iframe with
                    horizontal overflow
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dvoytenko at google.com

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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