b4a4e1cb_L_Basics__Table_tag_attributes__Purpose_
[Attribute:] border [Applies to:] table tr td [Purpose:] 
Thickness of a visible border. table: When the border attribute is missing, the table will not show a border, but the space for a border is there. border="0" makes the border vanish and the space for a border is gone, too.
Jan's HTML Basics: Table tag attributes
Purpose: