Created attachment 243549 [details]
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.
Created attachment 243550 [details]
Successful case, the green box can be clicked
Created attachment 244745 [details]
Comment on attachment 244745 [details]
Clearing flags on attachment: 244745
Committed r178574: <http://trac.webkit.org/changeset/178574>
All reviewed patches have been landed. Closing bug.