1782633 - dragend event should not make dataTransfer content available (from the drag datastore )

Status: NEW

(Core :: DOM: Copy & Paste and Drag & Drop, defect)

Description

[Karl Dubost💡 :karlcow]

This comes up during a discussion on https://bugs.webkit.org/show_bug.cgi?id=243374

Steps to reproduce

1. Go to https://jsfiddle.net/3vjnqdmw/show
2. Drag and Drag [Select this element...] into [Drop Zone]

Actual:
Status: Drop done
Data is: source

Expected:
Status: Drop done
Data is: empty

Summary:

On Chrome and Safari, the

According to
https://html.spec.whatwg.org/multipage/dnd.html#dndevents

The drag data store mode is
drop -> read-only mode
dragend -> protected mode

Protected mode.
https://html.spec.whatwg.org/multipage/dnd.html#concept-dnd-p

For all other events. The formats and kinds in the drag data store list of items representing dragged data can be enumerated, but the data itself is unavailable and no new data can be added.