Headers and footers are areas in the top and the bottom page margins in which you can add text or graphics. Headers and footers are added to the current page style. Any page that uses the same style automatically receives the header or footer that you add. You can insert Fields, such as page numbers and chapter headings, in headers and footers in a text document.
The page style for the current page is displayed in the Status Bar.
Some of the header and footer options are also available for HTML documents. Headers and footers are not supported by HTML and instead are exported with special tags, so that they can be viewed in a browser. Headers and footers are only exported in HTML documents if they are enabled in Web Layout mode. When you reopen the document in Office, the headers and footers are displayed correctly, including any fields that you inserted.