Blank rows have the same dimensions as the preceeding row, but with zero width spaces in the cells instead of text. Purple boxes are fixed sized contents.
first cell
| 50px | 200px |
| 40px | 200px |
| 60px | 200px |
| 100px | 200px |
| 400px | 200px |
| 600px | 200px |
second cell
| 200px | 50px |
| 200px | 40px |
| 200px | 60px |
| 200px | 100px |
| 200px | 400px |
| 200px | 600px |
both cells
| 50px | 50px |
| 40px | 40px |
| 60px | 60px |
| 100px | 100px |
| 400px | 400px |
| 600px | 600px |
both cells too large
| 400px | 400px |
| 40px | 40px |
| 60px | 60px |
| 100px | 100px |
| 400px | 400px |
first cell wider
| 400px | 200px |
| 40px | 40px |
| 60px | 60px |
| 100px | 100px |
| 200px | 200px |
| 400px | 400px |
second cell wider
| 200px | 400px |
| 40px | 40px |
| 60px | 60px |
| 100px | 100px |
| 200px | 200px |
| 400px | 400px |