add.length && add.pop().parentNode.classList.addClass("loaded").addClass("activity");
[HTML]Uncaught TypeError: add.pop is not a function[/HTML]
console.log(add):
NodeList(3) [ li.is-active, li.is-active, li.is-active]
0: <li class="is-active">
1: <li class="is-active">
2: <li class="is-active">
length: 3