Tricky issue with HTML5 drag and drop

Recently a reader asked about a tricky issue with HTML5 drag and drop. The issue is this:

HTML5 supports native drag and drop through draggable property and several events such as dragstart, drag, dragenter, dragleave, dragover and drop. Normally dragstart event handler is where you set the data that is to be transferred between the drag source and drop target. The drop event handler is where you handle the drop of a drag source, access the data transferred and process it further. Now, in this particular case only the dragstart and drop events were handled. And the drop event handler never used to get called. In other words dragging operation was successful but dropping operation was not.

http://www.bipinjoshi.net/articles/9ce78d52-7927-4fce-9dbc-d0d3f2bd6f70.aspx