Add and Remove classes from element in Javascript

classList is pretty smart and the most modern system of manipulating CSS class names in elements via JavaScript.

Adding class name:

const element = document.getElementById('txtMyText');

element.classList.add('myClass');

Removing class name:

const element = document.getElementById('txtMyText');

element.classList.remove('myClass');

Removing multiple class names:

const element = document.getElementById('txtMyText');

element.classList.remove('myClass1', 'myClass2')

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