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         [pre-title (cond [(string>? title "") `(p [[class "verse-heading"]] ,title)]
                          [else ""])])
    `(div [[class "poem"]] ,pre-title (pre ,pre-attrs ,@elems))))
(define (html-magick . elems)
  (txexpr
   'div '([class "antique"])
   (decode-elements
    elems
    #:string-proc
   (λ (s) (regexp-replace* #px"(?<!f)s(?![fkb\\s”,;.’:\\!\\?]|$)" s "ſ")))))
(module+ test
  (require rackunit)(decode-elements elems #:string-proc(λ (s) (regexp-replace* #px"(?<!f)s(?![fkb\\s]|$)" s "ſ")))))  ; round s at the end of a word
  (check-equal? (html-magick "is") '(div [[class "antique"]] "is"))
  ; round s before/after f
; always round s at the end of a word
  (check-equal? (html-magick "mirrors? yes, it is") '(div [[class "antique"]] "mirrors? yes, it is"))
  ; always round s before/after f
  (check-equal? (html-magick "offset, satisfaction") '(div [[class "antique"]] "offset, ſatisfaction"))  ; ; always LONG s before hyphen
  (check-equal? (html-magick "Shafts-bury") '(div [[class "antique"]] "Shaftſ-bury"))longs before hyphen  ; round s before k or b (17th-century rules)
; always round s before k or b (17th-century rules)
  (check-equal? (html-magick "ask, husband") '(div [[class "antique"]] "ask, husband"))  ; ; always LONG s everywhere else
  (check-equal? (html-magick "song, substitutes") '(div [[class "antique"]] "ſong, ſubſtitutes")) 
  ;; Nested elements
  (check-equal?
   (html-magick '(root "This is " (a [[href "class"]] (b "song, substitutes"))))
   '(div [[class "antique"]] (root "This is " (a [[href "class"]] (b "ſong, ſubſtitutes"))))))longs everywhere else |