Responsive Sidebar with Treeview
This is a graphical aid for visualizing and categorizing the site, in the style of an expandable and collapsable treeview component. It auto-expands to display the node(s), if any, corresponding to the currently viewed title, highlighting that node(s) and its ancestors. Load-on-demand when expanding nodes is available where supported (most graphical browsers), falling back to a full-page reload. MediaWiki-supported caching, aside from squid, has been considered so that unnecessary re-downloads of content are avoided where possible. The complete expanded/collapsed state of the treeview persists across page views in most situations.