table.cell.border.style
list 
none
solid
dotted
dashed
double
groove                       
ridge
inset
outset          
solid
table.cell.border.style
Specifies the border style of table cells
solid
Description
Specifies the border style of table cells.
  To control properties of cell borders in HTML output, you must also turn on the 
  table.borders.with.css parameter.