JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <ul id="list">
        <li class=""> ... </li>
        <li class=""> ... </li>
        <li class=""> ... </li>
        <li class=""> ... </li>
        <li class=""> ... </li>
        <li class="count"> ... </li>
    </ul>

    <div id="result"> ... </div>

    <p id="message" class="hidden"> check me i am hidden or not </p>

CSS

.hidden{
  
  display:none;
}

JavaScript

$(document).ready(function(){
   if($('li.count').length ==0){
     $('#message').removeClass('hidden');
    }
})