The issue I'm seeing is that you start tags, but don't close them. in your index file, you should add
</html> to the end. in your outline file, you need to add
</ul> to the end. One other issue is that your link on the index page is a direct link (it will try to take you to U3outline.html as if it were a site like google.com and not a file). This can be solved by removing the
http:// from the href.