Not a stupid question at all. Html Include Fragment feature is probably not of use to very many people. Its a very simple feature that allows you to include html from a static file in the page. The reason its a fragment is because it can't be a complete html file and work correctly. That is can't have an html, head, or body tag because the mojoportal page already supplies those so it can only be html fragment that would go inside a body tag.
This feature was requested by someone who has authored a lot of papers and wnated to show his bibliography on his web site. He already had a way of producing the fragment files so I threw this feature together for him quickly as it was/is very simple. The fragments can be uploaded using the File Manager and should go in the htmlfragments folder.
So if you have normal html files that you would like to include you can use this feature but you must remove the html head and body tags and only leave the stuff thats insode the body tag to create the fragment file.
Hope it helps,