DragPattern/DragDropPattern elements requires valid DropEffect
Elements that support Drag/Drop should have a valid 'DropEffect' set
This issue causes problems for people who rely on a screen-reader. The user will not be able to tell what effect this object has when dragging.
- The element, or its parent, has not created the DropEffect or DropEffects an incorrectly assigned name or label.
- A developer is not aware that screen readers read DropEffect(s).