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<!DOCTYPE html> <html> <head> <style> table { border-collapse: separate; width: 100%; border: 1px solid black; } td { border: 1px solid black; } table.ex1 { table-layout: auto; } table.ex2 { table-layout: fixed; } </style> </head> <body> <p>table-layout: auto:</p> <table class="ex1"> <tr> <td width="5%">1000000000000000000000000000</td> <td width="95%">10000000</td> </tr> </table> <p>table-layout: fixed:</p> <table class="ex2"> <tr> <td width="5%">1000000000000000000000000000</td> <td width="95%">10000000</td> </tr> </table> </body> </html>