It won’t fire because on-scroll relies on our js-scroller.
You would have to use something like this.
// grab elements as array, rather than as NodeList
var elements = document.querySelectorAll("...");
elements = Array.prototype.slice.call(elements);
// make each element do something on scroll
elements.forEach(function(element) {
window.addEventListener("scroll", function(evt) {
// not the most exciting thing, but a thing nonetheless
console.log(element);
});
});