Determines whether the system clipboard contains an object of the specified kind.
capi
clipboard-empty self &optional format => result
|   self⇩  |    
A displayed CAPI pane or interface.  | 
|   format⇩  |    
A keyword.  | 
|   result  |   t or nil. | 
The function clipboard-empty returns nil if there is an object of the kind indicated by format on the clipboard associated with self, or t otherwise.
format controls what kind of object is checked. The allowed values of format are as described for clipboard.
CAPI User Guide and Reference Manual (Macintosh version) - 01 Dec 2021 19:31:27