/** * First we need to create/select element * */ let el = document.createElement("div"); el.classList.toggle("example-class"); console.log(el); //Result: //<div class="example-class"></div> //Now we will add another class //using .add() el.classList.add("another-class"); console.log(el); //Result: //<div class="example-class another-class"></div> /** * Now, if we use .toggle() with .another-class * .another class will be removed * */ el.classList.toggle("another-class"); console.log(el); //Result: //<div class="example-class"></div>