JSFiddle - React, Tailwind, and code Playground

HTML

Table 1<br>
<table>
    <thead>
        <tr>
            <th>Metric</th>
            <th>Qty</th>
            <th>Min</th>
            <th>Avg</th>
            <th>Max</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Metric 1</td>
            <td>tqty</td>
            <td>min</td>
            <td>avg</td>
            <td>max</td>
        </tr>
        <tr>
            <td>Metric 2</td>
            <td>qty</td>
            <td>min</td>
            <td>avg</td>
            <td>max</td>
        </tr>
    </tbody>
</table>
Table 2<br>
<table>
    <thead>
        <tr>
            <th>Metric</th>
            <th>Qty</th>
            <th>Min</th>
            <th>Avg</th>
            <th>Max</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Metric 1</td>
            <td>tqty</td>
            <td>min</td>
            <td>avg</td>
            <td>max</td>
        </tr>
        <tr>
            <td>Metric 2</td>
            <td>qty</td>
            <td>min</td>
            <td>avg</td>
            <td>max</td>
        </tr>
    </tbody>
</table>



<table>
    <thead>
        <tr>
            <th rowspan="2">Metric</th>
            <th colspan="2">Qty</th>
            <th colspan="2">Min</th>
            <th colspan="2">Avg</th>
            <th colspan="2">Max</th>
        </tr>
        <tr>
            <td>table_1.label</td>
            <td>table_2.label</td>
            <td>table_1.label</td>
            <td>table_2.label</td>
            <td>table_1.label</td>
            <td>table_2.label</td>
            <td>table_1.label</td>
            <td>table_2.label</td>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Metric 1</td>
            <td>table_1 qty</td>
            <td>table_2 qty</td>
            <td>table_1 min</td>
            <td>table_2 min</td>
            <td>table_1 avg</td>
            <td>table_2 avg</td>
            <td>table_1 max</td>
            <td>table_2 max</td>
        </tr>
       ...

CSS

table, th, td {
    border: 1px solid black;
}