在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<style>table.ex1 {table-layout:auto}
table.ex2 {table-layout:fixed}
</style>
</head>

<body>
<table class="ex1" border="1" width="100%">
<tr>
<td width="5%">1000000000000000000000000000</td>
<td width="95%">10000000</td>
</tr>
</table>
<br>

<table class="ex2" border="1" width="100%">
<tr>
<td width="5%">1000000000000000000000000000</td>
<td width="95%">10000000</td>
</tr>
</table>

</body>
</html>

源代码

动行结果