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

Just click/tap the three bar menu icon at the top left of the browser window to slide in the top level menu, then click/tap a menu option with an icon to slide in that sub menu.

To go back to a previous level just click/tap the level information panel.

To close the menu at any time just click/tap the menu icon.