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You could use whitespace-mode itself to display form-feeds. Assuming you have whitespace-mode's newline style enabled, try evaling something like this before you start whitespace-mode: (add-to-list 'whitespace-display-mappings '(newline-mark ?\^L [?= ?= ?=])) If you want the line to extend across the width of your current window, you could eval something like this instead: (add-to-list 'whitespace-display-mappings `(newline-mark ?\^L ,(make-vector (1- (window-width)) ?=))) You might also be able to use window-configuration-change-hook or similar to adapt the length of the line as you resize the width of your window.