[Webkit-unassigned] [Bug 103672] New: Fixed position element in transformed container is not fixed when the container is scrollable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103672

           Summary: Fixed position element in transformed container is not
                    fixed when the container is scrollable
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: wangxianzhu at chromium.org
                CC: simon.fraser at apple.com, jamesr at chromium.org,
                    skyostil at chromium.org


Created an attachment (id=176825)
 --> (https://bugs.webkit.org/attachment.cgi?id=176825&action=review)
test case

Fixed position element under a transformed element (which creates a containing block) should be fixed within the containing block.
However, currently, the fixed position element behaves just like an absolute position element. When the containing block is scrollable, the fixed position element will scroll along with other contents.

To reproduce: open the attached test case, try to scroll the green block (a transformed element with overflow: scroll).

Actual result: the yellow block (fixed position element) scrolls in its container.

Expected result: the yellow block should remain fixed within its container (though it can scroll when the whole page is scrolled.)

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