JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <tbody id="items">
    <tr>
      <td>Item 1</td>
    </tr>
    <tr>
      <td>Item 2</td>
    </tr>
    <tr>
      <td>Item 3</td>
    </tr>
    <tr>
      <td>Item 4</td>
    </tr>
    <tr>
      <td>Item 5</td>
    </tr>
    <tr>
      <td><a>1</a>
        <a>2</a>
        <a class="a3">3</a>
      </td>
    </tr>

</table>

CSS

.opacity {
  color: red;
  opacity: .5;
}

JavaScript

var atd = $('.a3')
$("td").children().not(atd).addClass('opacity') //add class here