Includes A server-side include is a special HTML comment that is replaced by the server with other HTML code before the user sees the page. This lets you have things in your page which change automatically without having to change the page. They do add load for the server, so they are not recommended for every page, but they often come in handy for particular types of information.
Some commands take no tags at all, and most only take one.
The values of the tags must be in quotes, and there must be a space between the close quote of the final value and the end of the comment. To save load on the server, not all HTML files are checked for server-side includes, only those ending with .shtml. If you want to use server-side includes in a document, you have to give it a name ending in .shtml instead of .html. For a complete list of available server-side include commands, see NCSA's tutorial on the subject. Skip down to the section on the include format.