A Pen created at CodePen.io. You can find this one at http://codepen.io/skywalkapps/pen/YwRvyY.

 Dropdown menu inspired by Youtube context menus within a video player. Transitions between submenus create very neat experience. Also, menu provides information about selected values for each item.

It is built on top of <a href="http://skywalkapps.github.io/bootstrap-dropmenu/?source=codepen">Bootstrap Dropmenu</a>, which is an extension for Bootstrap framework.