js add class
var element = document.getElementById('element');
element.classList.add('class-1');
element.classList.add('class-2', 'class-3');
element.classList.remove('class-3');js add class
var element = document.getElementById('element');
element.classList.add('class-1');
element.classList.add('class-2', 'class-3');
element.classList.remove('class-3');html add css class
<h2
class="city main">London</h2>
<h2 class="city">Paris</h2>
<h2
class="city">Tokyo</h2>Copyright © 2021 Codeinu
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