Generic Drag & Drop add drop coordinates

[lipisak]

Describe your motivation

As developer I would like to have access to coordinates of dragged item within drop zone

Describe the solution you'd like

Add API to DropEvent which would return offsetX and offsetY drop event data which are part of generic HTML5 DnD DropEvent (event.offsetX, event.offsetY)

Describe alternatives you've considered

I've tried to use this solution

But it's not usable as I can't access the data that I would pass by setDragData method on DragSource.

Additional context

No response