[Webkit-unassigned] [Bug 164292] New: Sticky position should not use transformed position to compute sticky offset.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164292

            Bug ID: 164292
           Summary: Sticky position should not use transformed position to
                    compute sticky offset.
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: flackr at chromium.org
                CC: simon.fraser at apple.com

Created attachment 293590
  --> https://bugs.webkit.org/attachment.cgi?id=293590&action=review
Demo of sticky position in a transformed container.

A sticky position element in a transformed container should use its untransformed position for the sticky position offset constraint. In the attached test case it should appear to stick 100px down as the transform should effectively be applied on its sticky position (See test case in Firefox or Chrome with --enable-experimental-web-platform-features).

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