[Webkit-unassigned] [Bug 81681] New: Allow multiple colheads/col and multiple rowheads/row

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=81681

           Summary: Allow multiple colheads/col and multiple rowheads/row
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Accessibility
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aaronlevbugs at gmail.com
                CC: james at cookiecrook.com, cfleizach at apple.com,
                    dmazzoni at google.com, aboxhall at chromium.org


The current implementation of AXColumnHeaderUIElements and AXRowHeaderUIElements allows only 1 column header per column and 1 row header per row.

There are a number of combinations of markup that would allow more than 1 of a given header type for a row/column.

Caveats:
- this may require changes to the Mac API. If the API is changing anyway, it may be a good time to consider scope="rowgroup" and scope="colgroup", although they are rare.
- it may be a good time to consider the aria-labelledby case where each table cell explicitly indicates which table headers it is labelled by.
- ensure that any code which implements RowHeaderRole and ColumnHeaderRole is also updated to handle multiple headers per col/row.

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