Import Script, Import CSS, Import PHP
<style type='text/css' media='all'> @import 'directory/file.css'; </style>
<link rel='Shortcut Icon' href='directory/file.ico' type='image/x-icon'>
<?php @ require_once ('directory/file.html'); ?>
For the PHP import, by placing the @ symbol before require_once suppresses any error messages that might be generated in the included PHP file.
<%@ include file='jspfile.jspi' %>
And, well, I guess the list can go on and on. You can use Struts Tiles to include other JSP snippets. I am sure that other languages and frameworks have the same functionality.