This useful little stack element can perform two different tasks in your website. Firstly it provides a method to quickly setup manual 'previous' and 'next' navigation links in your webpages, for benefit of both website visitors and search engines indexing your website. These navigation links allow you to connect-up pages in a sequential order. The other function of this stack element is to generate a TOC (table of contents) which can be used to break-up a large block of content into smaller, linkable regions users can navigate more easily.