To change the default border, cellspacing, and cellpadding values for all tables:
[Tables] ; Border, Spacing and Padding defaults for full table Border=3 Spacing=2 Padding=6
The values for Border, Spacing, and Padding specified here become the values for HTML <table> attributes border, cellspacing, and cellpadding, respectively.
§33.4.7.2 Taming border, cellspacing, and cellpadding settings
§33.4.7.3 Excluding border, cellspacing, and cellpadding attributes