[Webkit-unassigned] [Bug 159794] New: Non-integer top / left on parent causes child with transform to be positioned incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159794

            Bug ID: 159794
           Summary: Non-integer top / left on parent causes child with
                    transform to be positioned incorrectly
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bicknellr at google.com
                CC: simon.fraser at apple.com

Created attachment 283706
  --> https://bugs.webkit.org/attachment.cgi?id=283706&action=review
examples

In the attached page, the cases labelled "scale3d transform" exhibit 140535 (no clipping) but also an issue where the transformed child (transparent red) is not aligned to its parent (cyan). Zooming causes the offset to change in all of the examples and, for the last two, the clipping behavior changes.

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