JSFiddle - React, Tailwind, and code Playground
HTML
<table>
<tr>
<td>first row</td>
</tr>
<tr>
<td>/* I only want to select this. */</td>
<td>/* I only want to select this. */</td>
</tr>
<tr>
<td>last row</td>
</tr>
</table>
JavaScript
$('table tr').filter(function(){
return $(this).children().length === 2;
}).css('color','red');