[Webkit-unassigned] [Bug 117121] New: [CSS Regions] Elements with animated transform are clipped if they fall entirely outside of the region

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117121

           Summary: [CSS Regions] Elements with animated transform are
                    clipped if they fall entirely outside of the region
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mibalan at adobe.com
                CC: WebkitBugTracker at adobe.com
            Blocks: 57312


Created an attachment (id=203516)
 --> (https://bugs.webkit.org/attachment.cgi?id=203516&action=review)
Test-case

Content flowed in a region that has an animated transform becomes invisible if/when the transform causes it to render outside the region.

Repro: Open attached test case and observe the animation of the gray <div> (the one with BOO in it)
Expected: Animation plays and is visible at all times
Actual: The animation plays, but as soon as the gray div is entirely outside of the region (red dashed border), it becomes invisible. It becomes visible again once part of it are again "inside" the region

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