Slanted diagonal line in html or css?
Based on CSS3 linear-gradients solution except that the angle is not hard coded:
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>Another approach would be to use SVG as it can scale easily to the size of your container.
Example :
div {
position: relative;
display:inline-block;
width: 100px;
height: 50px;
border: 1px solid #000;
}
.l{width:200px;}
.xl{width:300px;}
svg {
position: absolute;
width: 100%;
height: 100%;
}<div class="s">
<svg viewBox="0 0 10 10" preserveAspectRatio="none">
<line x1="0" y1="0" x2="10" y2="10" stroke="black" stroke-width="0.2" />
</svg>
</div>
<div class="l">
<svg viewBox="0 0 10 10" preserveAspectRatio="none">
<line x1="0" y1="0" x2="10" y2="10" stroke="black" stroke-width="0.2" />
</svg>
</div>
<div class="xl">
<svg viewBox="0 0 10 10" preserveAspectRatio="none">
<line x1="0" y1="0" x2="10" y2="10" stroke="black" stroke-width="0.2" />
</svg>
</div>