'bordercolordark' Syntax and Note
Note:
A three-dimensional border requires two shades of the same color to
give the appearance of 3D.
This attribute defines the darker shade of the border color.
Its value is either a color name or a hexadecimal color value using the
"#RRGGBB" method.
Syntax:
<table bordercolordark="value"> . . . </table>
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