how is this done? (drop down nav)

how is this done? (drop down nav)


how is the main "sections" nav done here???

all I see in the markup is the ul li for the main links in the top-level nav..  for example

  1. <li class="business" data-section="business">

the data is here (.jpt extension) what is this?

I thought because it uses stuff like "data-...." attribute in menu markup this was maybe done with jQuery?  with what is described here?

thank you....




PS: there are so many methods for doing dropdowns.. it's mind-boggling..
www.1stwebdesigner.com/css/38-jquery-and-css-drop-down-multi-level-menu-solutions/
http://slodive.com/web-development/best-jquery-dropdown-menus/

it's hard to decide what best method would be.... 

PS2:  I take those links back.. what I need to learn is responsive menus...   need to find best method for responsive menus...  I know I can find online, just wondering if there are opinions out there and what best method would be for responsive nav/menus....

thank you...