[Webkit-unassigned] [Bug 128988] New: offset{Height, Top} incorrect for table row groups in separate border model

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=128988

           Summary: offset{Height, Top} incorrect for table row groups in
                    separate border model
           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: dbates at webkit.org
                CC: hyatt at apple.com, bdakin at apple.com


In the separate border model, offsetTop and offsetHeight for a table row group includes vertical border spacing. But these offsets shouldn't include vertical border spacing from my understanding of the first and third paragraphs of <http://www.w3.org/TR/CSS2/tables.html#table-layout> (W3C Recommendation 07 June 2011), reproduced here:

[[
Internal table elements generate rectangular boxes with content and borders. Cells have padding as well. Internal table elements do not have margins. 

...

The edges of the rows, columns, row groups and column groups in the collapsing borders model coincide with the hypothetical grid lines on which the borders of the cells are centered. (And thus, in this model, the rows together exactly cover the table, leaving no gaps; ditto for the columns.) In the separated borders model, the edges coincide with the border edges of cells. (And thus, in this model, there may be gaps between the rows, columns, row groups or column groups, corresponding to the 'border-spacing' property.)
]]

That is, the offsetTop of a row group should be equal to the offsetTop of the left-most cell in the first row and the offsetHeight of a row group should be equal to the vertical border spacing between its rows plus the sum of the offsetHeights of its rows.

Currently, the offsetTop of a row group differs from the expected result because it includes the vertical spacing before the first row in the group. The offsetHeight of a row group differs from the expected result because it includes vertical border spacing both before the first row in the group and after the last row in the group.

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