An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Hierarchical, vertical navigation to place at the side of a page.
Single level
Two levels
Three levels
When to use the side navigation component
To display a navigational hierarchy with one to three levels.
To display the “sub-navigation” within a section of the website.
When to consider something else
Small site. If the site has fewer than five pages,
consider organizing the page without a navigational hierarchy.
Existing navigation. If your page already has a
horizontal and vertical navigation bar, consider ways to simplify your
navigation system.
Usability guidance
Show the current page. Indicate where a user is
within the navigational hierarchy. Use the “active” state to show users
which page they have navigated to.
Keep the navigation links short. They can be shorter
derivatives of page titles themselves.
Always test your navigation. If the navigation
hierarchy is too long, users may miss items at the bottom. If it’s too
deep, users may miss items that require too many clicks. Usability
test to find the right balance between breadth and depth.
Accessibility
Ensure the side navigational system is keyboard accessible.
Users should be able to tab through each link.
Implementation
The width of the current menu item’s highlight border is set with the $theme-sidenav-current-border-width variable.