[Webkit-unassigned] [Bug 113642] New: border-style: double rendering error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113642

           Summary: border-style: double rendering error
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://bhell.github.com/misc/border-style-double.html
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bhell at spamfence.net


Created an attachment (id=195862)
 --> (https://bugs.webkit.org/attachment.cgi?id=195862&action=review)
Test case reduction

Double left/right borders (CSS border-style: double) are displayed incorrectly for elements with a differing top/bottom border-style.

I noticed this with block elements directly following each other with no vertical space in-between. If they have double left/right borders, but no top/bottom borders, the double borders of the two different elements are separated by a one pixel wide line (in the background color of the element). This is the case even though there is no space between the elements otherwise. In iOS 6.1.3 Safari there is even a complete border visible, separating the two elements.

I prepared a page (see URL) showing the problem and a dirty workaround. A test case reduction is attached.

I tested with Safari 6.0.3 (8536.28.10, 537+, i.e. Webkit Nightly 2012-03-30), Chrome 26.0.1410.43, Chrome 28.0.1457.0 canary, Safari 6.0.3 (8536.28.10) (all on OS X 10.8.3). The problem is the same everywhere. With Gecko on the other hand, the two elements are rendered such that they cannot be distinguished visually.

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