JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/ui-lightness/jquery-ui.css">
<div id='step1'>
  step one
</div>
<div id='step2'>
  step two
</div>
<div id='step3'>
 step three
</div>

JavaScript

$("body").children(':not(#step2)').fadeTo("slow", 0.5, function() {
  // Animation complete.
});