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)