[Webkit-unassigned] [Bug 42498] New: transform3d causes incorrect compositing of border with background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42498

           Summary: transform3d causes incorrect compositing of border
                    with background
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P3
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: nick at charcoaldesign.co.uk


Created an attachment (id=61882)
 --> (https://bugs.webkit.org/attachment.cgi?id=61882)
Minimal HTML & CSS demonstrating problem

if an element has an border colour with partial alpha, and overflow hidden e.g:

border: 10px solid rgba(255,255,255,0.5);
overflow: hidden;

and you apply a translate3d value (even if it's zero), e.g:

-webkit-transform:translate3d(0,0,0);

Then the compositing of the border goes wrong. It appears to be an issue with how it's cropped.

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