Menu behaviour with keyboard navigation
Submitted by Greg Gay: Also noticed a couple other accessibility issues with the main menu. I can get through it with the Tab key (in a round about way), but not with the arrow keys. And, submenus remain open when navigating away from them. They should close when focus leaves the submenu, or the ESC key is pressed.
Ref: https://www.w3.org/TR/wai-aria-practices-1.1/examples/menubar/menubar-1/menubar-1.html