the method is called at the moment when drag-n-drop has started
| source | HTMLElement | a DOM element on which a dnd action started |
| event | Event | a native HTML event |
| HTMLElement | a DOM element of the drag marker |
The method isn't purposed for direct call! It is an extension point.
You can override it with your own logic, but check drag-n-drop related events first, as they provide a much more convenient way for drag-n-drop handling.
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