Element.className
Get all of the classes on an element as a string, add a class or classes, or completely replace or remove all classes.
let elem = document.querySelector('div');
// Get all of the classes on an element
let elemClasses = elem.className;
// Add a class to an element
elem.className += ' vanilla-js';
// Completely replace all classes on an element
elem.className = 'new-class';
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