You can do this with HTML alone using Server Side Includes. Simplest example:
index.html
Test
navbar.shtml
What you should never do is use framesets or iframes to do this. https://stackoverflow.com/a/15938545/822711
Please note, this will not work using the file:// protocol, it needs to run on a web server as it would in a live environment. This could be on a private or public server, or localhost using a server running on your computer such as wamp.
