JSFiddle - React, Tailwind, and code Playground

HTML

<table>
        <tbody>
            <tr>
                <td>1</td>
                <td>2</td>
            </tr>
            <tr>
                <td colspan="2">3</td>
            </tr>
        </tbody>
    </table>

JavaScript

alert($('tr').not(':has([colspan])').length)