The multi toggle responsive navigation on smaller screens is similar to nested accordions, the user touches primary level parent item to reveal list under it and when the screen is big enough vertical toggle menu changes to horizontal drop down navigation. Usually in toggle navigation on small screen the primary item of navigation is disabled and is only used as toggle button for opening and closing sub-menus but in this multi-toggle menu primary level parent item remain active and a small button at the right of menu item (big enough to be clickable) is appeared which is a great for user experience.
Download Multilevel Toggle Responsive Navigation Menu