| <!DOCTYPE html> |
| <style> |
| td { border: 1px solid black; padding: 5px; } |
| table { border-spacing: 0; } |
| </style> |
| <div style="columns: 2"> |
| <table> |
| <thead> |
| <tr><td> |
| <div style="columns: 2"> |
| <table> |
| <thead><tr><td>Inner</td></tr></thead> |
| <tr><td style="height: 100px"></td></tr> |
| <thead><tr><td>Inner</td></tr></thead> |
| <tr><td style="height: 100px"></td></tr> |
| </table> |
| </div> |
| </td></tr> |
| </thead> |
| <tr><td style="height: 400px"></td></tr> |
| <thead> |
| <tr><td> |
| <div style="columns: 2"> |
| <table> |
| <thead><tr><td>Inner</td></tr></thead> |
| <tr><td style="height: 100px"></td></tr> |
| <thead><tr><td>Inner</td></tr></thead> |
| <tr><td style="height: 100px"></td></tr> |
| </table> |
| </div> |
| </td></tr> |
| </thead> |
| <tr><td style="height: 400px"></td></tr> |
| </table> |
| </div> |