JSFiddle - React, Tailwind, and code Playground

by alsjka

HTML

<table>
<thead><tr><td></td></tr></thead>
<tfoot><tr><td>tfoot</td></tr></tfoot>
<tbody><tr><td>tbody</td></tr></tbody>
</table>

<table>
<thead><tr><td></td></tr></thead>
<tbody><tr><td>tbody</td></tr></tbody>
<tfoot><tr><td>tfoot</td></tr></tfoot>
</table>

<pre></pre>

JavaScript

var tr = document.querySelectorAll("table > tbody > tr");

document.querySelector("pre").textContent =
  tr[0].rowIndex + " " + tr[1].rowIndex;