I want to make a Table like this
是否可以添加一个倾斜的对角边框在表中？
基于CSS3 线性渐变 http://dev.w3.org/csswg/css-images-3/#linear-gradients解决方案，但角度不是硬编码的：
table:nth-of-type(1) td {
background-image: linear-gradient(
to top right,
white 48%,
black,
white 52%
);
}
table:nth-of-type(2) td {
background-image: linear-gradient(
to top right,
papayawhip calc(50% - 1px),
black,
papayawhip calc(50% + 1px)
);
}
/* for testing */
table {
border-collapse: collapse;
margin-top: 1em;
margin-bottom: 1em;
}
td:nth-child(odd) {
width: 10em;
}
td:nth-child(even) {
width: 20em;
}<table border="1">
<tbody>
<tr>
<td>Narrow</td>
<td>Wide</td>
</tr>
<tr>
<td>Narrow</td>
<td>Wide</td>
</tr>
</tbody>
</table>
<table border="1">
<tbody>
<tr>
<td>Narrow</td>
<td>Wide</td>
</tr>
<tr>
<td>Narrow</td>
<td>Wide</td>
</tr>
</tbody>
</table>