WordPress admin menus :hover functionality

Hey All,
I was noticing that the WordPress admin menu handles touch vs. hover events very elegantly– if you hover over an element it expands the submenu, and then you can click with a mouse to go to that link. Or if you touch it it will expand (but not follow the link), and then if you touch it again it will go to that link, or if you touch elsewhere it will collapse the submenu.

I can’t quite figure out how it’s implementing that– but it seems to work better than the hover submenus touch functionality I coded, so I’d like to know how. I notice that it has the aria-haspopup="true" property, is that it?

thxthx!