5.6. Effect on Tables
The ‘border-radius’ properties do
apply to ‘table’ and ‘inline-table’
elements. When ‘border-collapse’ is
‘collapse’, the UA may apply the
border-radius properties to ‘table’
and ‘inline-table’ elements, but is
not required to. In this case not only
must the border radii of adjacent
corners not intersect, but the
horizontal and vertical radii of a
single corner may not extend past the
boundaries of the cell at that corner
(i.e. the cell's other corners must
not be affected by this corner's
border-radius). If the computed values
of the border radii would cause this
effect, then the used values of all
the border radii of the table must be
reduced by the same factor so that the
radii neither intersect nor extend
past the boundaries of their
respective corner cells.
The effect of border-radius on
internal table elements is undefined
in CSS3 Backgrounds and Borders, but
may be defined in a future
specification. CSS3 UAs should ignore
border-radius properties applied to
internal table elements when
‘border-collapse’ is ‘collapse’.
