<html> <head> <style> table { border-collapse: collapse; border: 5px solid yellow; } *#col1 { border: 3px solid black; } td { border: 1px solid red; padding: 1em; } td.solid-blue { border: 5px dashed blue; } td.solid-green { border: 5px solid green; } </style> </head> <body> <P> <TABLE> <COL id="col1"><COL id="col2"><COL id="col3"> <TR id="row1"> <TD> 1 <TD> 2 <TD> 3 </TR> <TR id="row2"> <TD> 4 <TD class="solid-blue"> 5 <TD class="solid-green"> 6 </TR> <TR id="row3"> <TD> 7 <TD> 8 <TD> 9 </TR> <TR id="row4"> <TD> 10 <TD> 11 <TD> 12 </TR> <TR id="row5"> <TD> 13 <TD> 14 <TD> 15 </TR> </table> </p> </body> </html>