JSFiddle - React, Tailwind, and code Playground

by NickU

HTML

<main class="counter">
  <h1>Counter</h1>
  <div id="val" class="value">10</div>
  
  <button onClick="  
  document.getElementById('val').savedH = document.getElementById('val').height; 
  document.getElementById('val').height = '0px';
  document.getElementById('val').style.maxHeight = 'none';  
  document.getElementById('val').style.transition = 'all  1s';
  document.getElementById('val').classList.add('hidden');
  "> Hide Counter</button>
  
  <button onClick="  
  document.getElementById('val').style.height = document.getElementById('val').style.savedH + 'px'; 
  document.getElementById('val').classList.remove('hidden');
  ">Show Counter</button>
</main>

CSS

.counter {
  margin: 5rem auto;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
  width: 40rem;
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  background-color: #f4f0fa;
}

.value {
  font-size: 2rem;
  color: #3c0080;
  margin: 2rem 0;
  font-weight: bold;
  transition: all  1s;
  max-height: 500px;
  overflow: hidden;
}

.value.hidden {
  margin: 0;
}

JavaScript

var elem = document.getElementById("val");
if(elem) {
  console.log("height: " + elem.clientHeight);  
  val.style.height = elem.clientHeight;
}