This test is only relevant on platforms where it is possible to switch applications in mid-drag (eg. alt+tab, dragging over taskbar buttons, dragging between restored windows).
This testcase requires an external application that accepts dropping of unicode HTML from other applications - eg. Google Chrome (not Firefox or Internet Explorer). Load the helper file in the external application.
Drag this paragraph to the other application and release it. De-select the text in that application if it is selected. Pass if "Pass if this text is on a green background 中文אידישрусский" appears in the other application, and if it has a green background, and if the drag placeholder disappears when the drag is released.