JSFiddle - React, Tailwind, and code Playground

by isqua

HTML

<table>
    <tr>
        <td></td>
        <td class="union-cell">
            <div class="union-strut">
                <div class="union-strut-wrapper" data-last-title="Второй">
                    <div class="union">
                        <div class="union-content">Шляпа</div>
                    </div>
                </div>
            </div>
        </td>
        <td></td>
        <td></td>
    </tr>
    <tr>
        <td></td>
        <td>Первый столбец</td>
        <td>Второй</td>
        <td></td>
    </tr>
    <tr>
        <td>1</td>
        <td>100500</td>
        <td>1010101010101</td>
        <td>fadfasfd</td>
    </tr>
    <tr>
        <td>2</td>
        <td>100500</td>
        <td>1010101010101</td>
        <td>fadfasfd</td>
    </tr>
</table>

CSS

td {
    font-family: Arial;
    padding-right: 10px;
}

.union-cell {
    height: 1em;
    position: relative;
}

.union-strut {
    position: absolute;
    left: 0;
    right: 0;
    background: yellow;
}

.union-strut-wrapper {
    position: absolute;
    left: 0;
    top: 0;
    padding-left: 100%;
}

.union-strut-wrapper::after {
    content: attr(data-last-title);
    height: 0;
    overflow: hidden;
    display: inline-block;
}

.union {
    position: absolute;
    left: 0;
    right: 0;
    display: flex;
}

.union::before,
.union::after {
    content: " ";
    flex: 1 0 auto;
    border-top: 1px solid #ccc;
    height: .5em;
}

.union::before {
    border-left: 1px solid #ccc;
}

.union::after {
    border-right: 1px solid #ccc;
}

.union-content {
    position: relative;
    top: -0.5em;
    padding: 0 5px;
}
}