Scroll polling example

poll.js

var element = $('.element-with-scrolling');

// don't do this
element.attachEventListener('scroll');

// do this instead
window.requestAnimationFrame(poll);

var pollScrollPos = function () {
    var scrollPos = element.scrollLeft;
    // ...
    window.requestAnimationFrame(pollScrollPos);
};

pollScrollPos = pollScrollPos.bind(contextExample);