/Html/How to add active class to current element javascript

How to add active class to current element javascript

<script>
  function func(){
   document.getElementById('div').classList.add('active');
  }
</script>

<button onclick='func()'>Click</button>
<div id="div">
  This element gets 'active' class.
</div>

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Error: input is a void element tag and must neither have `children` nor use `dangerouslySetInnerHTML`.
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