<!DOCTYPE html> <html> <head> <style type="text/css"> td { border: 1px solid green; } </style> </head> <table> <tr> <td width="50%">A</td> </tr> <tr> <td width="100%">B</td> </tr> <tr> <td> <table width="100%"> <tr> <td width="100%">The quick brown fox jumps over the lazy wordwrap</td> </tr> </table> </td> </tr> </table> </body> </html>