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The main navigation menu of the site appears on the custom 404 error page.
Saves users from a break in navigation flow, arriving on cul de sac pages and having to use the browser back button.
The 404 error page broached in best practice no 82 makes use of the navigation data of the site either dynamically either statically.
modify a URL in order to obtain an 404 error and verify that the returned page uses main menu elements