JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tbody>
<tr id=10>
<td rowspan="2" width="110">Name</td>
<td width="110">Size</td>
<td width="110">Status</td>
</tr>
<tr>
<td>Meter</td>
<td>true/false</td>
</tr>
<tr>
<td>Code A</td>
<td>1</td>
<td>false</td>
</tr>
</tbody>
</table>

JavaScript

let tr = document.getElementsByTagName("tr")[0];
let td = tr.getElementsByTagName("td")[0];
let rowspan = td.rowSpan? td.rowSpan:1; 
var nodes = document.querySelectorAll(`tbody tr:nth-child(-n+${rowspan})`);
for (let i = 0; i < nodes.length; i++) {
  nodes[i].style.background = '#1DA6C0';
}