https://harvestchapelofvenice.org/wp-content/themes/ichthys/js/animate.js?ver=1.0.0

1var docElem = window.document.documentElement;
2
3    function getViewportH() {
4        var client = docElem['clientHeight'],
5            inner = window['innerHeight'];
6        
7        if( client < inner )
8            return inner;
9        else
10            return client;
11    }
12
13    function scrollY() {
14        return window.pageYOffset || docElem.scrollTop;
15    }
16
17    function getOffset( el ) {
18        var offsetTop = 0, offsetLeft = 0;
19        do {
20            if ( !isNaN( el.offsetTop ) ) {
21                offsetTop += el.offsetTop;
22            }
23            if ( !isNaN( el.offsetLeft ) ) {
24                offsetLeft += el.offsetLeft;
25            }
26        } while( el = el.offsetParent )
27
28        return {
29            top : offsetTop,
30            left : offsetLeft
31        }
32    }
33
34    function inViewport( el, h ) {
35        var elH = el.offsetHeight,
36            scrolled = scrollY(),
37            viewed = scrolled + getViewportH(),
38            elTop = getOffset(el).top,
39            elBottom = elTop + elH,
40            // if 0, the element is considered in the viewport as soon as it enters.
41            // if 1, the element is considered in the viewport only when it's fully inside
42            // value in percentage (1 >= h >= 0)
43            h = h || 0;
44
45        return (elTop + elH * h) <= viewed && (elBottom) >= scrolled;
46    }
47(function ( $ ) {
48
49    'use strict';
50
51    $.fn.animateIn = function(){
52    
53        var el = $(this);
54        var height = $(window).innerHeight();
55        
56        el.css('opacity', '0');
57        
58        $(window).scroll(function(){
59            
60            el.each(function(){
61                
62                el.css('opacity', '100');
63                
64                var scrollTop  = $(window).scrollTop();
65                var obj = $(this);
66                var offset = obj.offset();
67                var top = offset.top;
68                var distance = (top - scrollTop);
69
70                if( distance < screen.availHeight-100 ){
71                    var incoming = $(this).data('animate');          
72                    $(this).addClass('animated ' + incoming);
73                }
74                
75            });
76
77        });    
78        
79    };
80
81}( jQuery ));
82
83