[Webkit-unassigned] [Bug 126357] New: [fragmentation] Border box for each fragment

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126357

           Summary: [fragmentation] Border box for each fragment
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://lists.w3.org/Archives/Public/www-style/2013Dec/
                    0466.html
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: krit at webkit.org
                CC: hyatt at apple.com, simon.fraser at apple.com,
                    mihnea at adobe.com, mibalan at adobe.com
            Blocks: 126336


Firefox and Internet Explorer create a new border box for each fragment of an element. This has rather big consequences on layout and CSSOM View.

CSS Transforms does use border box for calculating the transform origin. For a multi-column layout each fragment is transformed individually "after" layout was done (each fragment has its own user space). Therefore, the origin changes for each fragment.

Clipping paths can be sized per fragment width instead of calculating a global dimension for a clipping path.

On the other hand, it is unclear how the width of a background tile is determined (another discussion on www-style).

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