[Webkit-unassigned] [Bug 158629] New: Focus event dispatched in iframe causes parent document to scroll incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158629

            Bug ID: 158629
           Summary: Focus event dispatched in iframe causes parent
                    document to scroll incorrectly
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aaron_chu at apple.com

Created attachment 281025
  --> https://bugs.webkit.org/attachment.cgi?id=281025&action=review
a test case to demonstrate the bug

On a very long page, when the focus event is dispatched in an iframe to focus an element within the frame, the browser scrolls the page so that the iframe becomes visible when the scrollY begins at the top of the document (0). If the scrollY begins with a value > 0, the browser incorrectly scroll pass the frame.

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