JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td rowspan="2">A</td>
        <td class="b">B</td>
    </tr>
    <tr>
        <td class="c">C</td>
        <td class="d">D</td>
    </tr>
</table>

CSS

table {
    border-collapse: collapse;
}

td {
    border: 5px solid black;
    padding: 5px;
}

td.b {
    border-left: 6px solid red;
}

td.d {
    /* This is not rendered */
    border-left: 6px solid blue;
}

td.c {
    display: none;
}