[Webkit-unassigned] [Bug 202687] New: iFrame prevents document scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202687

            Bug ID: 202687
           Summary: iFrame prevents document scrolling
           Product: WebKit
           Version: Other
          Hardware: Macintosh
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gerhard.preuss at kimeta.de

This is new as of Safari 13 on OSX.

iFrames seem to trap/capture scroll events and prevent the document to scroll (trackpad/touch input).

Reproduce:
https://codepen.io/lipp/pen/LYYEEgd

Expected behaviour:
Page scrolls normal as if the iFrame were an image.

Actual behaviour:
Page is not scrollable when the (touch) input pointer is above the iFrame (green rect in example).

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