https://alistapart.com/wp-content/themes/ala/js/sidebar-related.js?ver=1

1( function( $) {
2	$( window ).load( function() {
3		setSidebarHeight();
4		window.onresize = setSidebarHeight;
5
6		/**
7		 * Set the related posts sidebar below other sidebar items and enable scrollbar if the main content height is too small.
8		 * This is only run if contentWidth is larger than 1294px.
9		 */
10		function setSidebarHeight() {
11			const sidebarMargin = 22;
12			const targetContentWidth = 1249;
13			const article = document.querySelector( '.entry-content' );
14			const sidebar = document.querySelector( '.ala-single-sidebar-related' );
15			const sidebarWrapper = document.querySelector( '.sidebar-related' );
16			const sidebarContent = document.querySelector( '.ala-sidebar-content' );
17			const author = document.querySelector( '.ala-author' );
18			const minutiae = document.querySelector( '.ala-single-sidebar-minutiae' );
19			const vw = Math.max(document.documentElement.clientWidth || 0, window.innerWidth || 0);
20
21			if ( article && sidebar ) {
22				if ( vw >= targetContentWidth ) {
23					let offsetTop = 0;
24					const articleHeight = article.clientHeight;
25					let authorHeight = 0;
26					let minutiaeHeight = 0;
27					const sidebarHeight = sidebarContent.clientHeight;
28					const contentHeight = (authorHeight + articleHeight - minutiaeHeight - 80);
29
30					let sidebarRect = sidebarWrapper.getBoundingClientRect();
31					let offsetTopSidebar = sidebarRect.top + window.scrollY;
32
33					if ( author ) {
34						authorHeight = author.clientHeight;
35					}
36
37					if ( minutiae ) {
38						let rect = minutiae.getBoundingClientRect();
39						offsetTop = rect.top + window.scrollY;
40						minutiaeHeight = minutiae.clientHeight;
41					}
42
43					sidebar.style.top = (sidebarMargin + offsetTop - offsetTopSidebar + minutiaeHeight ) + 'px';
44					if ( contentHeight < sidebarHeight ) {
45						sidebarContent.style.height = (authorHeight + articleHeight - minutiaeHeight - 80) + 'px';
46					}
47					sidebar.style.visibility = 'visible';
48				} else {
49					sidebarContent.style.height = 'auto';
50				}
51			}
52		}
53	});
54} )( jQuery );