Button control_html/css_WEB-ITnose

I wrote a code that includes a button control and a table, but why is the button control not within the scope of the table, and the leftmost part of the button happens to be on the rightmost side of the table~
Please give me some advice, I can’t tell you much. ! I hope you can give me some advice

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Where is the code?

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	System	System	Negative	Class	pre
	public	Thetd>	Wanfang	Revised	2013-01-12

Um, I don’t understand. Do you want this effect?

<table border="1" width="500">    <thead>        <tr>            <th>选择</th>            <th>姓名</th>            <th>版本</th>            <th>日期</th>        </tr>    </thead>    <tbody>        <tr>            <td>                <input type="checkbox" /><a href="#">公</a>            </td>            <td>姓名</td>            <td>1.1</td>            <td>2012-09-24</td>        </tr>        <tr>            <td colspan="4" style="text-align:right">                <input type="button" value="导出" />            </td>        </tr>    </tbody></table>

Because you didn’t write the button into the table at all, the button control is not within the scope of the table~