May I ask why the width of a small table can be larger than that of a large table in table nesting?

Question

Answer 1

The height of tr should be deleted. Sorry, although the basic style is not wrong, the table inside it has overflowed. My fault

Answer 2

The row height of your external table is 150px and the internal table is 156px, then the internal table will overflow

Answer 3

is a typo, it’s high