The default value of this attribute is 3. Cell padding can be controlled using the padding properties, but only in Explorer. Navigator will refuse to recognize it. Cell borders are a slightly more complicated affair. CSS2 specifies two different border models for tables, each working in a slightly different way.
Navigator completely ignores borders on cells.
Explorer only works with one of the border schemes, the separate border scheme. In this scheme, each cell has an individual border as specified by its border properties, and the spacing between borders are separated by a length given by the border-spacing property. The collapsing border model, in which borders can be specified for cells and collapse between them, is currently unsupported. Since an in-depth discussion about these schemes is largely philosophical in nature due to the fact that they're unimplemented, we'll talk about them in a future tutorial. This again accepts a value that indicates the width of the table's border.