to see the main menu. Hovering over those items having children, indicated by the 'hand-down' icon 
reveals further in-line concertina sub-menus as appropriate. Click on the cancel icon 
to close the menu.A fairly standard strip bar menu, allowing sub menus to cascade either to the left or right.
Decrease the size of the view port, click on the hamburger menu icon to see the main menu. Hovering over those items having children, indicated by the 'hand-down' icon reveals further in-line concertina sub-menus as appropriate. Click on the cancel icon to close the menu.
A free standing version of this example is available for download here.