JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr><td>wrong</td></tr>
    <tr><td>wrong</td></tr>
    <tr><td id="fromTd" rowspan="4"></td></tr>
    <tr><td>wrong</td></tr>
    <tr><td>wrong</td></tr>
    <tr><td>wrong</td></tr>
    <tr><td>right!</td></tr>
    <tr><td>wrong</td></tr>
    <tr><td>wrong</td></tr>
    <tr><td>wrong</td></tr>
</table>

JavaScript

$(function() {
    var eq = $("#fromTd").attr("rowspan") - 1;
    var row = $("#fromTd").parent("tr").nextAll(':eq(' + eq + ')');
    alert(row.children('td').text());
});