Each cell side can have a different border style, it is acceptable to draw solid borders for all border styles, and it is not necessary to handle diagonal borders between cells.

1. Each cell side Border style - It is OK
bhfjc can have a to draw solid borders
different border for all border styles
edit

2. Display border
color

3. OK not to
handle
diagonal
borders

4. Border style - It
All cell borders
Each cell side can
is OK to draw
solid borders
have a different for all border
border styles
Display border color
OK not to handle
diagonal borders