[Webkit-unassigned] [Bug 48386] New: Setting "overflow:hidden" overwrites preserve-3d transform style

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48386

           Summary: Setting "overflow:hidden" overwrites preserve-3d
                    transform style
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: vangelis at chromium.org
                CC: simon.fraser at apple.com, cmarrin at apple.com


Created an attachment (id=71953)
 --> (https://bugs.webkit.org/attachment.cgi?id=71953&action=review)
Example demonstrating the bug

It appears that when a composited layer clips its descendants, the descendant layers get flattened to the parent surface even if the preserve-3d property is set. I'm attaching an example which is a trivially modified version of the transform-style demo from the 3d CSS blog.  All that's added is an "overflow:hidden" property on the #parent style.

I suspect this is a side-effect of how CA implements clipping in transformed layers...

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