Submenu toggling without Javascript

[mestaritonttu]

I like your menu, but was wondering, if the submenu toggling could be done without JS.

I found this menu, which only uses CSS and manages to toggle the submenus in mobile view: http://fofwebdesign.co.uk/freebies-for-websites/css/multi-rwd-side-fly-menu.htm (styles are included inside the html).

Perhaps you could borrow some functionality from it?

edit: I also found this multi-level menu solution, which uses :target selector: http://www.stephanemartinw.com/articles/23-responsive-menu-css-only
Styles are not mobile-first, though.