JSFiddle - React, Tailwind, and code Playground

HTML

<div>Test div</div>
<input type="button" value="Get Height" />

CSS

div{
    display:none;
    height:100px;
}

JavaScript

$('input').click(function(){
   var h = $('div').show().height();
   $('div').hide();  
   alert(h); 
});