https://www.w3.org/TR/CSS22/tables.html#empty-cells
Since Table Layout Level 3 proposes to do away with empty-cells in favor of using :empty, that is also tested here.
|  |  | < Empty \/ | 
| A header row | Contained in a theadelement |  | 
| tbodycell 1-1 | tbodycell 1-2 |  | 
| tbodycell 2-1 | tbodycell 2-2 |  | 
| tbodycell 3-1 | tbodycell 3-2 |  | 
| A footer row | That lacks a tfootparent |  | 
|  |  | < Empty \/ | 
| A header row | Contained in a theadelement |  | 
| tbodycell 1-1 | tbodycell 1-2 |  | 
| tbodycell 2-1 | tbodycell 2-2 |  | 
| tbodycell 3-1 | tbodycell 3-2 |  | 
| A footer row | That lacks a tfootparent |  | 
|  |  | < Empty \/ | 
| A header row | Contained in a theadelement |  | 
| tbodycell 1-1 | tbodycell 1-2 |  | 
| tbodycell 2-1 | tbodycell 2-2 |  | 
| tbodycell 3-1 | tbodycell 3-2 |  | 
| A footer row | That lacks a tfootparent |  | 
|  |  | < Empty \/ | 
| A header row | Contained in a theadelement |  | 
| tbodycell 1-1 | tbodycell 1-2 |  | 
| tbodycell 2-1 | tbodycell 2-2 |  | 
| tbodycell 3-1 | tbodycell 3-2 |  | 
| A footer row | That lacks a tfootparent |  | 
|  |  | < Empty \/ | 
| A header row | Contained in a theadelement |  | 
| tbodycell 1-1 | tbodycell 1-2 |  | 
| tbodycell 2-1 | tbodycell 2-2 |  | 
| tbodycell 3-1 | tbodycell 3-2 |  | 
| A footer row | That lacks a tfootparent |  |