Other layout inside cells — flex row, block stack, wrapping text

Expected: cell 1 holds a flex row of three equal boxes filling the cell width. Cell 2 holds three stacked blocks with margins; the row grows to fit them. Cell 3 holds a paragraph that wraps within its column width; the whole row takes the tallest cell's height.

one
two
three
first block
second block
third block
This paragraph of text is long enough that it will need to wrap onto several lines inside its table cell, which makes this row taller than a single line of text.