This is an example about how to provide drag and drop functionality from and to an iFrame
Click the 'Box over box dragging' checkbox to trigger 'highlight drop-zone if boxes overlap' and
see how the drop-zone helpers position dependent on the coordinates you clicked the drag objects,
otherwhise the drop-zone only highlights when the mouse enters.
This example does not include scroll correction, nor IE8 support (due to lack of getElementsByClassName)
I'm the main document