Hi, Trident and WebKit both implement beforecopy, beforecut, and beforepaste events. These events need to be spec'ed in http://dev.w3.org/2006/webapi/clipops/clipops.html
Most significantly, those events appear to be fired when UAs try to determine whether copy, cut, and paste menu items in their native UI should be enabled or not. e.g. they fire when context menu is to be shown. Best, Ryosuke Niwa Software Engineer Google Inc.
