[Webkit-unassigned] [Bug 150161] New: Transition on transform does not render when entering overflow hidden container

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150161

            Bug ID: 150161
           Summary: Transition on transform does not render when entering
                    overflow hidden container
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.0
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: contact at benfrain.com

Here is a reduction:

http://codepen.io/anon/pen/epGrvr

This works correctly in iOS8.4 (Simulator) and Safari 9 but not in the iOS Safari 9 or 9.1

If a wrapper has overflow: hidden applied and child elements are transitioned outside of the bounds, they do not get 'painted' as they are transformed back (until the transition ends and then the items are 'painted' at once).

This makes it appear like the interior elements are not being painted until transition end.

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