The main site navigation bar consists of the following eight items: * 'Top' button -- * 'Up' button -- , , etc. * 'First' button -- * 'Previous' button -- * 'Next' button -- * 'Last' button -- * 'Document' menu -- see below * 'More' menu -- see below The 'Document' menu supports the following: * 'Table of Contents' item -- * 'Chapters' menu -- Any number of * 'Sections' menu -- Any number of * 'Subsections' menu -- Any number of * 'Appendices' menu -- Any number of * 'Glossary' item -- * 'Index' item -- The 'More' menu supports the following: * 'Help' item -- * 'Search' item -- * 'Authors' item -- , , etc. * 'Copyright' item -- * 'Bookmarks' menu -- Any number of * 'Other Versions' menu -- Any number of * Additional menus -- Unrecognised values, e.g. one or more , receive their own menu Unfortunately not all of the attribute values specified above are listed as being valid in HTML 4.X or XHTML 1.X. Section 6.12 of the HTML 4 Recommendation http://www.w3.org/TR/html4/types.html#type-links includes the following link types: Alternate, Start, Next, Prev, Contents, Index, Glossary, Copyright, Chapter, Section, Subsection, Appendix, Help and Bookmark. Some examples (from the source of a BugZilla page):