1.

<table>
    <colgroup>
        <col>
        <col class="alternative">
        <col>
    </colgroup>
    <tr>
        <td>This</td>
        <td>That</td>
        <td>The other</td>
    </tr>
    <tr>
        <td>Ladybird</td>
        <td>Locust</td>
        <td>Lunch</td>
    </tr>
</table>

2.<table>

<caption> **</caption>vs figcaption

caption-side:bottom;

3.

<table>
    <thead>
        <tr>
            <td>Header 1</td>
            <td>Header 2</td>
            <td>Header 3</td>
        </tr>
    </thead>
    <tfoot>
        <tr>
            <td>Footer 1</td>
            <td>Footer 2</td>
            <td>Footer 3</td>
        </tr>
    </tfoot>
    <tbody>
        <tr>
            <td>Cell 1</td>
            <td>Cell 2</td>
            <td>Cell 3</td>
        </tr>
        <!-- etc. -->
    </tbody>
</table>

【HTML】Advanced3：Tables: Columns, Headers, and Footers,布布扣,bubuko.com

【HTML】Advanced3：Tables: Columns, Headers, and Footers