https://www.tvsmotor.com/assets/js/animate.js?=3-09-26_1

1// Trigger CSS animations on scroll.
2// Detailed explanation can be found at http://www.bram.us/2013/11/20/scroll-animations/
3
4// Looking for a version that also reverses the animation when
5// elements scroll below the fold again?
6// --> Check https://codepen.io/bramus/pen/vKpjNP
7
8jQuery(function ($) {
9
10    // Function which adds the 'animated' class to any '.animatable' in view
11    var doAnimations = function () {
12
13        // Calc current offset and get all animatables
14        var offset = $(window).scrollTop() + $(window).height(),
15            $animatables = $('.animatable');
16
17        // Unbind scroll handler if we have no animatables
18        if ($animatables.length == 0) {
19            $(window).off('scroll', doAnimations);
20        }
21
22        // Check all animatables and animate them if necessary
23        $animatables.each(function (i) {
24            var $animatable = $(this);
25            var halfSize = $animatable.height() - ($animatable.height() / 1.5);
26            if (($animatable.offset().top + halfSize) < offset) {
27                $animatable.removeClass('animatable').addClass('animated');
28            }
29        });
30
31    };
32
33    // Hook doAnimations on scroll, and trigger a scroll
34    $(window).on('scroll', doAnimations);
35    $(window).trigger('scroll');
36
37});