Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Summary
The :-moz-drag-over
CSS pseudo-class is used to edit an element when a drag-over event is called on it.
Syntax
element:-moz-drag-over { style properties }
Example
CSS
td:-moz-drag-over { color: red; }
HTML
<table border="1"> <tr> <td width="100px" height="100px">Drag Over</td> </tr> </table>