JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<div class="icon devHidden">TD1</div>
<div class="icon devHidden">TD2</div>
<div class="icon devHidden">TD3</div>
</div>

CSS

.container{
  
}

.icon{
  width:100%;
  background:green;
}

.devHidden{
  display: none;
}

JavaScript

var elements = document.querySelectorAll('.devHidden');
for (var i = 0; i < elements.length; i++){
  elements[i].className = elements[i].className.replace("devHidden", "");
}