[nightly-unstable] column-visibility-004 does not get 2 implementation pass

Hello,

http://test.csswg.org/suites/css2.1/nightly-unstable/html4/column-visibility-004.htm

IMO, Opera 12.0 fails this test by reducing the cell width of
border-spacing.

http://test.csswg.org/suites/css2.1/nightly-unstable/html4/reference/column-visibility-004-ref.htm

I can not see what IE 9.0.7 does with that test right now.
Chrome 20.0.1132.47 and Firefox 13.0.1 fail this test.

Gérard
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