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