add more than one class j code example
Example: add multiple class list at once in js
elem.classList.add("first");
elem.classList.add("second");
elem.classList.add("third");
is equal to :
elem.classList.add("first","second","third");
elem.classList.add("first");
elem.classList.add("second");
elem.classList.add("third");
is equal to :
elem.classList.add("first","second","third");