漂亮的表格

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<table id="mytable" cellspacing="0" summary="The technical specifications of the Apple PowerMac G5 series">
<caption> </caption>
  <tr>
    <th scope="col" abbr="Configurations" class="nobg">Configurations</th>

<th scope="col" abbr="Dual 1.8">Dual 1.8GHz</th>
    <th scope="col" abbr="Dual 2">Dual 2GHz</th>
 <th scope="col" abbr="Dual 2.5">Dual 2.5GHz</th>
  </tr>
  <tr>
    <th scope="row" abbr="Model" class="spec">lipeng</th>
    <td>M9454LL/A</td>

<td>M9455LL/A</td>
    <td>M9457LL/A</td>
  </tr>
  <tr>
    <th scope="row" abbr="G5 Processor" class="specalt">mapabc</th>
    <td class="alt">Dual 1.8GHz PowerPC G5</td>
    <td class="alt">Dual 2GHz PowerPC G5</td>

<td class="alt">Dual 2.5GHz PowerPC G5</td>
  </tr>
  <tr>
    <th scope="row" abbr="Frontside bus" class="spec">地图名片</th>
    <td>900MHz per processor</td>
    <td>1GHz per processor</td>
    <td>1.25GHz per processor</td>

</tr>
  <tr>
    <th scope="row" abbr="L2 Cache" class="specalt">图秀卡</th>
    <td class="alt">512K per processor</td>
    <td class="alt">512K per processor</td>
    <td class="alt">512K per processor</td>
  </tr>

</table>

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