Retractable Menu
Problem
Users need to access the navigation but they may need the screen space even more
Solution
Create a menu that can be put aside and easily retrieved again.

From
www.nikewomen.com
Use when
When the screen space is scarce and the
Main Navigation takes relatively too much space. Alternatively consider a horizontal
Trail Menu in combination with
Fly-out Menu.
How
Implemented using dynamic html, will also require some form of
Liquid Layout.
Why
This pattern mainly saves a lot of screen-space while having the menu still available. In contrast to a
Fly-out Menu or
Overlay Menu a retractable menu stays on the page when activated.
More Examples