JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr name="foo">
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
</tr>
<tr name="foo">
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
</tr>
<tr name="foo">
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
</tr>
<tr  name="foo">
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
  <td> foo</td>
</tr>
</table>

JavaScript

xx = document.getElementsByName("foo");
console.log(xx);
xxx= document.getElementsByTagName("tr");
console.log(xxx);
xxx.forEach(
function(elt){
   console.log(elt);
   elt.style.backgroundColor="cyan";
   });