[Webkit-unassigned] [Bug 68193] New: Vertical border-spacing space gets doubled across row-group elements

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68193

           Summary: Vertical border-spacing space gets doubled across
                    row-group elements
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: data:text/html;charset=utf-8,<!DOCTYPE%20html>%0A<tabl
                    e>%0A%20<thead>%0A%20%20<tr>%0A%20%20%20<td>head1%0A%2
                    0%20%20<td>head2%0A%20<tbody>%0A%20%20<tr>%0A%20%20%20
                    <td>one%0A%20%20%20<td>two%0A%20%20<tr>%0A%20%20%20<td
                    >three%0A%20%20%20<td>four%0A<%2Ftable>%0A<style>%0Atd
                    %20{%20background%3A%20gold%3B%20border-radius%3A%205p
                    x%3B%20border%3A%20thin%20solid%20black%3B%20}%0Atable
                    %20{%20border-spacing%3A%200%2010px%3B%20}%0A<%2Fstyle
                    >
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tables
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tabatkins at google.com
                CC: me at leaverou.me


See the data url attached.

The vertical component of 'border-spacing' is doubled between rows that are part of different row-groups.  In the test case, the first row is in a <thead> and the latter two are in a <tbody>, so the gap between the first and second row is 20px, while the gap between the second and third is 10px, which is what is actually set in the CSS.

(I suspect we're using machinery similar or identical to margin collapsing, and making row groups prevent collapsing across themselves.)

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