存在合并行，導致在瀏覽器中列印的時候缺少邊框，請教下是什么原因？
<tr>
<td align="center" colspan="8"><span text="標題">標題</span></td>
</tr>
下面的代碼影響了列印，注釋掉列印就有邊框了
<tr>
<td width="15%" align="center" rowspan="2"><span text="列1">列1</span></td>
<td width="34%" align="center" black; colspan="3"><span text="列2">列2</span></td>
<td width="17%" align="center" black; rowspan="2" colspan="2"><span text="列3">列3</span></td>
<td width="34%" align="center" colspan="2"><span text="列4">列4</span></td>
</tr>
<tr>
<td width="17%" align="center"><span text="列5">列5</span></td>
<td width="17%" align="center" colspan="2"><span text="列6">列6</span></td>
<td align="center"><span text="列7">列7</span></td>
<td align="center"><span text="列8">列8</span></td>
</tr>
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標籤：HTML5