Use W3C documentation for the XHTML1.1 table model. (http://www.w3.org/TR/xhtml-modularization/abstract_modules.html#s_tablemodule)
Specifies the amount of space, in pixels, between the border of a cell and the contents of a table cell
Best Practice: Although the Tag Set can enforce only that this attribute contain any text, numbers, or special characters, best practice is to constrain this value to a counting number (positive integer).
| Value | Meaning |
|---|---|
| Counting number | Thickness, measured in pixels of the cell padding |
| Restriction: |
|