On 08/13/2012 11:55 PM, Ryosuke Niwa wrote:
On Mon, Aug 13, 2012 at 9:19 PM, fantasai <[email protected] 
<mailto:[email protected]>> wrote:

    The CSSWG discussed drag-and-drop pseudo-classes today. The current
    proposal is to have three pseudo-classes:

       * One for the element representing the drop target that
         would receive the item if it were dropped.
       * One for all elements representing possible drop targets
         that could receive the item.

How do we find these elements? On one hand, if we're only supporting dropzone 
attribute, then adding new pseudo element seems
unnecessary. On the other hand, I can't think of ways to detect whether an 
element could return false or prevents the default
action on dragover/dragenter events without firing those events.

I don't know. I'm just going on what was asked for in the following thread. :)
  http://lists.w3.org/Archives/Public/www-style/2011Sep/0402.html

The spec prose so far is this:
  http://dev.w3.org/csswg/selectors4/#drag-pseudos
The definition is pretty generic; I'm happy to add details on how
exactly it should work with HTML, if someone can provide them.

~fantasai

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