JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<input required="required" />
<input required />

CSS

.required {background-color:#bada55}

JavaScript

$('input').each(function () {
  if ($(this).attr('required') != undefined)
      $(this).addClass('required');
});