Add a class to an element
Note that multiple parameters for the add() isn't supported in IE 11.
ele.classList.add("class-name");
// Add multiple classes (Not supported in IE 11)
ele.classList.add("another", "class", "name");
Remove a class from an element
Note that multiple parameters for the remove() isn't supported in IE 11.
ele.classList.remove("class-name");
// Remove multiple classes (Not supported in IE 11)
ele.classList.remove("another", "class", "name");
Toggle a class
ele.classList.toggle("class-name");