JSFiddle - React, Tailwind, and code Playground

by interdream

HTML

<table> 
 <tbody> 
  <tr class="blinkYellow"> 
   <td>Col 1</td> 
   <td>Col 2</td> 
   <td>Col 3</td>
   <td>Col 3</td>
  </tr> 
  <tr> 
   <td class="block">Col 1</td> 
   <td>Col 2</td> 
   <td>Col 3</td>
   <td>Col 3</td>   
  </tr> 
  <tr class="blinkYellow"> 
   <td>Col 1</td> 
   <td>Col 2</td> 
   <td>Col 3</td>
   <td>Col 3</td>   
  </tr>
  <tr> 
   <td>Col 1</td> 
   <td>Col 2</td> 
   <td>Col 3</td>
   <td>Col 3</td>
  </tr> 
 </tbody> 
</table>

JavaScript

var e = document.getElementsByClassName("blinkYellow");
for(var i = 0; i < e.length; i++) {
    e[i].style.backgroundColor = "yellow";
}