NS_ASSERTION(0, "NOT IMPLEMENTED"); return NS_ERROR_NOT_IMPLEMENTED;
nsCOMPtr<nsIDOMSelection> selection; nsresult rv; rv = GetDocumentSelection(getter_AddRefs(selection)); if (NS_FAILED(rv)) return rv;  PRBool isCollapsed; selection->GetIsCollapsed(&isCollapsed);  *aCopyable = PR_TRUE; return NS_OK;
NS_IMETHODIMP DocumentViewerImpl::GetCopyable(PRBool *aCopyable){  NS_ASSERTION(0, "NOT IMPLEMENTED");  return NS_ERROR_NOT_IMPLEMENTED;}