Currently, hovering over a variable that stores a DOM element will show the subclass but not allow navigation to the node in the DOM tree view. If the DOM element is still alive, we should hyperlink it so that clicking will reveal it. (It would be nice to show a preview placard/doorhanger/popover so the user can see what will happen when clicking links, but that's something needing improvement everywhere)
<rdar://problem/18407044>