Question

How to add a class name to HTML element using JavaScript

Answer 1

<div id="divid">
 div element
</div>

<button id="buttonid">Add class</button>

.container {
  color: green;
}

const div = document.getElementById('divid');
const btn = document.getElementById('buttonid');

btn.addEventListener('click',()=>{
    div.classList.add('container');})
  
    
    
    
    
/*
run:
    


*/

 

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