[Webkit-unassigned] [Bug 39591] New: rgba semi-transparent borders overlap (are drawn twice) in the corners

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39591

           Summary: rgba semi-transparent borders overlap (are drawn
                    twice) in the corners
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: richard at 2010.atterer.net


Created an attachment (id=56868)
 --> (https://bugs.webkit.org/attachment.cgi?id=56868)
Test case

When I request a border around a box like this:

<div style="border:40px solid rgba(0,128,0,.5)">X</div>

then the semi-transparent border is drawn twice over each corner of the box. In other words, the vertical and horizontal parts of the border overlap in the corner.

Tested with WebKit-r60027. There are some similar bugs, e.g. #21835, but they all seem to involve border radius or similar advanced border CSS, so I created a new bug instead.

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