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