[Webkit-unassigned] [Bug 123858] New: table with `border-collapse: collapse` and td with translucent border doesn’t render properly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123858

           Summary: table with `border-collapse: collapse` and td with
                    translucent border doesn’t render properly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tables
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rmondello at apple.com
                CC: rniwa at webkit.org


Created an attachment (id=216115)
 --> (https://bugs.webkit.org/attachment.cgi?id=216115&action=review)
An archive containing a small html file illustrating the problem as well as a screenshot comparing Firefox and 

When a table is styled with `border-collapse: collapse` and its cells have a border defined with opacity (e.g. rgba(0, 0, 0, 0.1)), a single border color should be calculated and uniformly applied throughout the border of the table. That is, regions should not get darker on edges and corners between cells.

Gecko seems to do this much better than WebKit does, although it’s not perfect (see the slight diagonal at the corners). I’ve attached a sample document that illustrates the issue, as well as a screenshot that compares Firefox 24.0 and Safari 7.

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