If you use a page fragment in a page template, changes in the page fragment are also applied immediately to all the pages created from the template. Page fragment files that are created with the New Web Page wizard have a .jspf or .jsf extension; however, files with .html or .jsp extensions can also be treated as fragments.
Files without explicit <html>, <head>, or <body> tags are treated as fragments, because a fragment cannot stand alone as a Web page. You can edit style sheet information, <meta> tags, and <title> tags for the page fragment; however, the page fragment will be converted to a normal page with <html>, <head> and <body> tags.
Relative links are resolved from the page fragment, not from the parent document.