Absolutely no javascript/jQuery or any other script, this menu uses just css to produce a multi level concertina menu with bounce, suitable for all the latest browsers and operating systems.

This menu gets away from using unordered lists for multi-level menus but instead uses nested divs, which proved easier to work with on this type of menu.

So to open a sub menu just click/tap an item with the icon to the left, and to close the same sub menu click/tap the same list item.

If you have more than one level of sub menus open you can click/tap a previous level item to close all the open child sub menus, or open another parent/child level to close the open branch sub menus.
For example, if you click/tap 'Computers' > 'Desktops' > 'All-in-one' to open that sub menu. Then click/tap 'Computers' to only show that sub-menu. Then click/tap 'Computers' again to close that sub menu and go back to the the menu with all sub menus closed.

Sub-menus open with a bounce action, produced with just css, and close with a normal slide up action.

Finally you can change the basic color of the menu with just one background color style change:-
#sn_menu {position:relative; width:200px; margin:20px auto; background:#069; border-radius:5px;}