[Webkit-unassigned] [Bug 139815] New: Element appears correctly but does not receive event with a large translation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139815

            Bug ID: 139815
           Summary: Element appears correctly but does not receive event
                    with a large translation
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh Intel
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: julienq at apple.com
                CC: graouts at apple.com, simon.fraser at apple.com

Created attachment 243549
  --> https://bugs.webkit.org/attachment.cgi?id=243549&action=review
Failure case: the red box does not respond to click event.

An element translated inside another translated div where both have a very large translation (e.g. translate3d(-41946499px, -28497722px, 0px) for the parent div, and translate3d(41946743px, 28497858px, 0px) for the child element) is displayed correctly but events such as "click" 

Attached are two files showing a reduction of this bug. In the failure case, the red box appears at the right position (the blue box in the corner is provided as a reference) but cannot be clicked. In the successful case, the green box appears and behaves as expected; the translation values are smaller than in the failing case, while still being pretty large.

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