PhpSpreadsheet/tests/data/Reader/HTML/rowspan.html

<table>
    <tbody>
    <tr>
        <td>A1</td>
        <td>B1</td>
        <td>C1</td>
        <td>D1</td>
    </tr>
    <tr>
        <td colspan='3"'>A2 with invalid colspan</td>
        <td>D2<td>
    </tr>
    </tbody>
</table>