default.table.rules — The default column and row rules for tables using HTML markup
Tables using HTML markup elements can use an attribute
named rules on the table or
informaltable element
to specify whether column and row border rules should be
displayed. This parameter lets you specify a global default
style for all HTML tables that don't otherwise have
that attribute.
These are the supported values:
Rules will appear between all rows and columns.
Rules will appear between rows only.
Rules will appear between columns only.
Rules will appear between row groups (thead, tfoot, tbody). No support for rules between column groups yet.
No rules. This is the default value.
The border after the last row and the border after
the last column are not affected by
this setting. Those borders are controlled by
the frame attribute on the table element.