Older browsers that don’t support HTML frames won’t display anything when they attempt (and fail) to load a page containing the code to set up frames. So a good design tip is to use the
Browsers that support frames will ignore any code between these two tags. However, browsers that don’t understand frames will pick up the code between them and display it. Here’s an example of how you can be polite to users of such older browsers:
Example for browsers that don't support frames Put your code for non-frames browsers here.