onDragDrop
The instruction(s) to be executed are placed within quotes. This event handler will execute the instruction(s) when the user lets go of, or drops, an element from the desktop into a window or frame.

The following example will display text of your choosing in a message box when the user lets go of, or drops, an element from the desktop into a window or frame:
onDragDrop="msgWindow.document.write('-- Insert text message here --')"
This Event Handler is used with the following:

window