如何让table在body下垂直居中

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1.
经测试多浏览器下实用<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head> <title>test</title> <meta http-equiv=Content-Type content="text/html; charset=utf-8"> <meta content="MSHTML 6.00.6000.16825" name=GENERATOR></head><body>    <table height="100%" width="100%" border="0">        <tbody>            <tr>                <td align="center" valign="middle">                    <table cellspacing="0" cellpadding="0" width="270" align="center" border="0">                        <tbody>                            <tr>                                <td>                                    213                                </td>                                <td>                                    12                                </td>                                <td>                                    12                                </td>                            </tr>                            <tr>                                <td>123                                </td>                                <td>                                    321                                </td>                                <td>                                    12                                </td>                            </tr>                        </tbody>                    </table>                </td>            </tr>        </tbody>    </table></body></html> 最关键的应该是:<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">


2.

<div style="position:absolute;top:50%;left:50%;margin:-250px 0 0 -260px;width:400px;height:200px;font-family:Arial, Helvetica, sans-serif;color:#666666 ">


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