disable_pointer_events.js

/**
     * Disable and enable event on scroll begin and scroll end.
     * @see http://www.thecssninja.com/javascript/pointer-events-60fps
     */
    var root = document.documentElement;
    var timer;

    window.addEventListener('scroll', function() {
        // User scrolling so stop the timeout
        clearTimeout(timer);
        // Pointer events has not already been disabled.
        if (!root.style.pointerEvents) {
            root.style.pointerEvents = 'none';
        }

        timer = setTimeout(function() {
            root.style.pointerEvents = '';
        }, 500);
    }, false);