我想在一些具有position: absolute
的表格单元格上添加一个::before
选择器,但它失败了:
table{ border:1px solid #ccc; padding:10px; }
table td{ border:1px solid #ccc; padding:5px; }
.useBefore::before{
content:'before';
position:absolute;
}
<table>
<tbody>
<tr>
<td>bird</td>
<td>animal</td>
<td>nature</td>
</tr>
<tr class='useBefore'>
<td>building</td>
<td>robot</td>
<td>city</td>
</tr>
</tbody>
</table>
我注意到如果我将::before
添加到所有的tr
中,那么它就起作用了:
table{
border:1px solid #ccc;
padding:10px;
}
table td{
border:1px solid #ccc;
padding:5px;
}
tr::before{
content:'before';
position:absolute;
}
<table>
<tbody>
<tr>
<td>bird</td>
<td>animal</td>
<td>nature</td>
</tr>
<tr class='useBefore'>
<td>building</td>
<td>robot</td>
<td>city</td>
</tr>
</tbody>
</table>