案例：html/html5 案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<body>
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​
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<table border="1">
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  <colgroup span="2" width="100" />
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  <tr>
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    <th>Month</th>
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    <th>Savings</th>
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  </tr>
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  <tr>
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    <td>January</td>
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    <td>$100</td>
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  </tr>
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  <tr>
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    <td>February</td>
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    <td>$80</td>
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  </tr>
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</table>
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​
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</body>
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</html>
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​