https://albaladnews.net/js/sticky.js

1function testTheiaStickySidebars() {
2    var me = {};
3    me.scrollTopStep = 1;
4    me.currentScrollTop = 0;
5    me.values = null;
6
7    window.scrollTo(0, 1);
8    window.scrollTo(0, 0);
9
10    $(window).scroll(function(me) {
11        return function(event) {
12            var newValues = [];
13            
14            // Get sidebar offsets.
15            $('.theiaStickySidebar').each(function() {
16                newValues.push($(this).offset().top);
17            });
18            
19            if (me.values != null) {
20                var ok = true;
21                
22                for (var j = 0; j < newValues.length; j++) {
23                    var diff = Math.abs(newValues[j] - me.values[j]);
24                    if (diff > 1) {
25                        ok = false;
26                        
27                        console.log('Offset difference for sidebar #' + (j + 1) + ' is ' + diff + 'px');
28                        
29                        // Highlight sidebar.
30                        $($('.theiaStickySidebar')[j]).css('background', 'yellow');
31                    }
32                }
33                
34                if (ok == false) {                    
35                    // Stop test.
36                    $(this).unbind(event);
37                    
38                    alert('Bummer. Offset difference is bigger than 1px for some sidebars, which will be highlighted in yellow. Check the logs. Aborting.');
39                    
40                    return;
41                }
42            }
43            
44            me.values = newValues;
45            
46            // Scroll to bottom. We don't cache ($(document).height() - $(window).height()) since it may change (e.g. after images are loaded).
47            if (me.currentScrollTop < ($(document).height() - $(window).height()) && me.scrollTopStep == 1) {
48                me.currentScrollTop += me.scrollTopStep;
49                window.scrollTo(0, me.currentScrollTop);
50            }
51            // Then back up.
52            else if (me.currentScrollTop > 0) {
53                me.scrollTopStep = -1;
54                me.currentScrollTop += me.scrollTopStep;
55                window.scrollTo(0, me.currentScrollTop);
56            }
57            // Then stop.
58            else {                    
59                $(this).unbind(event);
60                
61                alert("Great success!");
62            }
63        };
64    }(me));
65}