[Webkit-unassigned] [Bug 58532] New: Inconsistent calculation of the position of centered items

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58532

           Summary: Inconsistent calculation of the position of centered
                    items
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rq at akl.lt


Created an attachment (id=89561)
 --> (https://bugs.webkit.org/attachment.cgi?id=89561&action=review)
Test case

There is an inconsistency in WebKit between calculating the position of centered background image and centered (using margin: auto) block-level elements. When the size of a centered background or element differs from the size of what it is being centered in by an odd number (e.g. the element/background is 100px wide, and its parent is 151px wide), the centered backgound will be offset 0.5px to the right from the exact center, but a centered block-level element will be offset to the 0.5px to the left from it.

This inconsistency slightly breaks design of websites which expect those calculations to be consistent.

Test case attached. If everything looks fine in it, try resizing your window horizontally.

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