Nested grid tables. ``` % pandoc -f html -t markdown --columns=72 <table> <tr> <td> <table> <tr> <td> <table> <tr> <td>some text</td> </tr> </table> </td> </tr> </table> </td> </tr> </table> ^D +-----------------------------------------------------------------------+ | +------------------------------------------------------------------+ | | | ----------- | | | | some text | | | | ----------- | | | +------------------------------------------------------------------+ | +-----------------------------------------------------------------------+ ```