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Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. A DOMTokenList representing the contents of the element's class attribute. There are 3 main ways to add and remove multiple classes: Using the classListmethod add or remove multiple classes. Not to mention using the same id is not even valid HTML. The classList property is an object that contains the list of classes of the element. If the class attribute is not set or empty, it returns an empty DOMTokenList, i.e. Inside the download source files, we need to copy the bootstrap.min.css file to our CSS folder. It is an extension of the HTML