How to remove a class from a DOM element

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When you have a DOM element reference you can remove a class using the remove method:

element.classList.remove('myclass')

You can add a new class to it by using the add method:

element.classList.add('myclass')

Implementation detail: classList is not an array, but rather it is a collection of type DOMTokenList.

You can’t directly edit classList because it’s a read-only property. You can however use its methods to change the element classes.