[Webkit-unassigned] [Bug 179315] New: Content not painted when scrolling an overflow node inside an iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179315

            Bug ID: 179315
           Summary: Content not painted when scrolling an overflow node
                    inside an iframe
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: dvoytenko at google.com, simon.fraser at apple.com

Created attachment 326110

  --> https://bugs.webkit.org/attachment.cgi?id=326110&action=review

Testcase

The attached testcase contains an overflow node inside an iframe. The overflow itself node contains some green rectangle. On iOS 11, the green rectangle is not visible/painted when you scroll the overflow node down. Note that changing a bit the CSS or HTML content may make the green rectangle visible. 

This issue was initially reported in https://github.com/ampproject/amphtml/issues/11829 ; and the testcase was reduced from https://output.jsbin.com/veficav/quiet

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