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These methods from http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#the-datatransfer-interface are currently spec'ed as void, should return a boolean value indicating whether the operation passed or failed. This is how Microsoft has spec'ed these methods: http://msdn.microsoft.com/en-us/library/ms536352.aspx http://msdn.microsoft.com/en-us/library/ms536744.aspx and while it's not a feature most scripts will make use of, it could be useful if for example a web application expects to run on a platform where the memory available for clipboard operations is limited, or where another application may have locked the clipboard when the setData()/clearData() method is called.
With the DnD-derived model where these methods operate on a DataTransfer object and not directly on the clipboard, we can not really give the script feedback on whether they succeeded or not, because we won't know that until the script has completed. Invalid.
mass-move component to LC1