anchor.diff:    ((url ""))
     (:accessor-name-transformer #'class*:name-identity))
   
  -(define-class input-hint (focusable-hint) ())
  -
  -(define-class textarea-hint (focusable-hint) ())
  +(define-class input-hint (focusable-hint)
  +  ((placeholder-text "" :documentation "The placeholder text of the input element.
  +I.e. the grey text initially seen in it."))
  +  (:accessor-name-transformer #'class*:name-identity))
  +
  +(define-class textarea-hint (focusable-hint)
  +  ((placeholder-text "" :documentation "The placeholder text of the textarea.
  +I.e. the grey text initially seen in it."))
  +  (:accessor-name-transformer #'class*:name-identity))
   
   (define-class image-hint (link-hint)
     ((alt "" :documentation "Alternative text for the image."))
  
positive.code:                   ("input"
                     (make-instance 'input-hint
                                    :identifier (alex:assoc-value element :identifier)
                                    :hint (alex:assoc-value element :hint)))
                    ("textarea"
                     (make-instance 'textarea-hint
                                    :identifier (alex:assoc-value element :identifier)
                                    :hint (alex:assoc-value element :hint)))
                    ("img"
                     (make-instance 'image-hint
                                    :identifier (alex:assoc-value element :identifier)
  
negative.code:           ((equal "BUTTON" (ps:@ element tag-name))
             (ps:create "type" "button" "hint" hint "identifier" hint "body" (ps:@ element |innerHTML|)))
            ((equal "INPUT" (ps:@ element tag-name))
             (ps:create "type" "input" "hint" hint "identifier" hint "placeholder" (ps:@ element placeholder)))
            ((equal "TEXTAREA" (ps:@ element tag-name))
             (ps:create "type" "textarea" "hint" hint "identifier" hint "placeholder" (ps:@ element placeholder)))
            ((equal "IMG" (ps:@ element tag-name))
             (ps:create "type" "img" "hint" hint "identifier" hint "src" (ps:@ element src) "alt" (ps:@ element alt)))
            ((ps:@ element onclick)
  