JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<div class="demo">

<div id="slider"></div>

    <div class='rsize'></div>
</div><!-- End demo -->

JavaScript

$("#slider").slider({
  min: 0,
  max: 24, // max is 24
  step: 2,
  slide: function(event, ui) {
      $(".rsize").text((ui.value >18)?(ui.value-4)+'W':ui.value);
  }
});