There's this from the W3C specification[1] that may shed some light:
The following properties apply to column and column-group elements:
'border'
The various border properties apply to columns only if 'border-collapse' is
set to 'collapse' on the table element. In that case, borders set on columns
and
column groups are input to the conflict resolution algorithm that selects the
border styles at every cell edge.
'background'
The background properties set the background for cells in the column, but
only if both the cell and row have transparent backgrounds. See "Table layers
and transparency."
'width'
The 'width' property gives the minimum width for the column.
'visibility'
If the 'visibility' of a column is set to 'collapse', none of the cells in
the column are rendered, and cells that span into other columns are clipped. In
addition, the width of the table is diminished by the width the column would
have taken up. See "Dynamic effects" below. Other values for 'visibility' have
no effect.
It seems that other style properties do not apply to COLs.
[1] http://www.w3.org/TR/CSS21/tables.html#q4
Cordially,
David
--
David Hucklesby, on 12/20/2005
<http://www.hucklesby.com/>
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