W3School TIY Editor
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<html> <head> <style type="text/css"> table.one { table-layout: automatic } table.two { table-layout: fixed } </style> </head> <body> <table class="one" border="1" width="100%"> <tr> <td width="20%">1000000000000000000000000000</td> <td width="40%">10000000</td> <td width="40%">100</td> </tr> </table> <br /> <table class="two" border="1" width="100%"> <tr> <td width="20%">1000000000000000000000000000</td> <td width="40%">10000000</td> <td width="40%">100</td> </tr> </table> </body> </html>