JSFiddle - React, Tailwind, and code Playground
HTML
<div><table><tbody>
<tr><td>Row 1</td></tr>
</tbody></table></div>
<table><tbody>
<tr><td>Row 1</td></tr>
<tr><td>Row 2</td></tr>
<tr><td>Row 3</td></tr>
</tbody></table>
<table><tbody>
<tr><td>Row 1</td></tr>
<tr><td>Row 2</td></tr>
</tbody></table>
CSS
table { border:1px solid black; }
JavaScript
alert($('table').has("tr:nth-child(2)").length)