It seems that setting a percentage on the div is what makes td collapse helplessly into a dot.
First reported here: http://code.google.com/p/chromium/issues/detail?id=76786
Need to make table rows support absolute positioning (even if we leave them not supporting relative positioning).
I think this is a bogus reduction btw, since IE grows boxes in quirks mode to encompass their widths, and other browsers don't support relative positioning on table cells.
The original reduction in the Chromium bug has position:absolute on the table row, and I think that's likely the reason WinIE works with it (and is what we actually need to fix here).
I think this is an evangelism issue. In quirks mode in WinIE boxes will always grow to enclose their contents. I don't see anything wrong with our rendering of either the reduction in this bug or the reduction in the Chromium bug.
The ship has long since sailed on implementing the width turns into minwidth quirk in quirks mode, so I think we're stuck with evangelism.
Possibly an evangelism issue, but in the meantime a fix: http://code.google.com/p/chromium/issues/detail?id=76786#c19