disable_pointer_events.js

/**
 * Disable and enable event on scroll begin and scroll end.
 * @see http://www.thecssninja.com/javascript/pointer-events-60fps
 */
(function(r, t) {
    window.addEventListener('scroll', function() {
        // User scrolling so stop the timeout
        clearTimeout(t);
        // Pointer events has not already been disabled.
        if (!r.style.pointerEvents) {
            r.style.pointerEvents = 'none';
        }
        t = setTimeout(function() {
            r.style.pointerEvents = '';
        }, 500);
    }, false);
})(document.documentElement);