Need clarity on listbox, menu, dialog, or something else

Hi, all

I’ve been going through the ARIA specs and am trying to work out how a particular pop-up widget should be marked up. An example can been seen on the BBC’s news page (for example: http://www.bbc.com/news/av/uk-42970067/cheddar-man-dna-shows-early-brit-had-dark-skin). Take a look at the Share link on the right of the page (assuming you’re on a desktop display). What could that pop-up panel be marked up as? Looking at ARIA 1.1, I feel it could be:


  1.  A listbox (“A widget that allows the user to select one or more items from a list of choices.”)
  2.  A menu (“A menu is often a list of common actions or functions that the user can invoke.”) although this feels weaker as it’s not “presented in a manner similar to a menu on a desktop application”.
  3.  A non-modal dialog (“A dialog is a window overlayed on either the primary window or another dialog window.”)

Any advice would be gratefully received.

Thanks

—
Francis Storr, Intel