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

This is the previous menu updated to just have the current sub menu visible and the options of moving back to any previous menu level.

This version uses 'flexbox' to center the menu vertically and has a panel to the left of the menu which can be used for any information you like.

To open the menu click/tap the three bar icon at the top right of the page. The menu will always be shown in the start position with all sub menus closed.

To open a sub menu just click/tap an item with a right pointing finger, and to close the sub menu click/tap any of the items with a left pointing finger.

The menu will stay vertically aligned until it becomes too high for screen and requires scrolling to see all the items.

To close the menu click/tap the 'cross' at the top right of the screen, this will close any open sub menus before closing the menu.