You can specify default HTML attributes for most table-related tags, although values for some attributes might not be recognized by some browsers.
To specify default attributes for all tables:
[Attributes] ; HTML element = attributes (macro) to set
You can specify attributes here for the following tags: body, table, tr, td, th, thead, tfoot, and tbody. For example:
[Attributes] table= rules="rows" th= align="left" bgcolor="yellow" td= valign="top"
List all attributes for a given tag on one line, even if that line is very long. Also see §33.5.5 Specifying row-group, row, and cell attributes with macros.
No border, cellspacing, or cellpadding
If you list attributes for the <table> tag, do not include border, cellspacing, or cellpadding; if you do, DITA2Go writes duplicate assignments for any of these you specify in [Attributes]. Use one of the following instead:
Also see §33.4.7.2 Taming border, cellspacing, and cellpadding settings.