[Webkit-unassigned] [Bug 147668] New: [Mac] Correct latching error for non-scrollable iframe nested inside scrollable div.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147668

            Bug ID: 147668
           Summary: [Mac] Correct latching error for non-scrollable iframe
                    nested inside scrollable div.
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

The WebKit latching logic improperly causes the main frame to scroll in the following case:

1. The page contains an iframe that is sized so that its contents do not need to scroll.
2. The iframe is marked as "overflow: hidden"
3. The iframe is contained in a div, which is sized so that it needs to scroll.

When this happens, the latching logic improperly skips the containing div, and passes the wheel events to the main frame.

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