Cannot change border-width frame parameter

[Drew Adams]

emacs -Q
M-: (modify-frame-parameters (selected-frame) '((border-width . 50)))

give this error, which speaks of "window", not "frame":

Debugger entered--Lisp error: (error "Cannot change the border width of a
window")
  modify-frame-parameters(#<frame address@hidden 0x1447e00>
((border-width . 50)))
  eval((modify-frame-parameters (selected-frame) (quote (...))))
  eval-expression((modify-frame-parameters (selected-frame) (quote (...)))
nil)
  call-interactively(eval-expression)



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