[Webkit-unassigned] [Bug 93855] New: Border rendering edge case difference between Chrome and Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93855

           Summary: Border rendering edge case difference between Chrome
                    and Safari
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://www.gingerbeardman.com/webkit/border-quirk.html
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Minor
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: matt.sephton at gmail.com


Situation:
there are two elements, with borders.
the second element is offset over the other by 1px.
(the offset element's z-index is higher/above as it comes later in the document)
the colour of the single overlapping edge is changed to that of the background colour.

Results:

Chrome, Firefox: the border that has been recoloured cuts into one of it's adjacent borders.
in the example, there is a notch out of the right hand border

Safari, Webkit Nightly: the edge where the overlap occurs is no longer visible against the background colour.
Adjusting the browser display zoom factor will show that the column is indeed cut, but Safari/WebKit Nightly chooses not to display this cut as a whole pixel.

Tested, right border has notch:
Chrome 21.0.1180.75, [Mac OS X]
Chrome 21.0.1180.75 m, [Windows XP, Windows 7]
Firefox 14.0.1 [Mac OS X, Windows XP, Windows 7]

Tested, right border is complete:
Safari 6.0 (8536.25), WebKit 536.25 [Mac OS X]
WebKit Nightly 6.0 (8536.25, 537+), WebKit 537.4+ [Mac OS X]
Safari on iOS 5.1.1

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