anchor.diff:     (search-always-auto-complete-p
       t
       :type boolean
  -    :documentation "Whether auto-completion works even for non-prefixed search.
  -Auto-completions come from the default search engine.")
  +    :documentation "Whether auto-completion acts on non-prefixed searches.
  +Suggestions are computed by the default search engine.")
      (keep-search-hints-p
       t
       :type boolean
  -    :documentation "Whether to keep search hints when the search prompt for the `search-buffer' command is closed.")
  +    :documentation "Whether to keep search hints when the search prompt for the
  +`search-buffer' command is closed.")
      (scroll-distance
       50
       :type integer
  
positive.code: (define-class document-buffer (buffer)
    ((document-model-delta-threshold
      10
      :documentation "Update the document model when the amount of elements on the
      page change greater than this amount."
      :export nil)
     (document-model
      nil
  
negative.code:    (horizontal-scroll-distance
      50
      :type integer
      :documentation "Horizontal scroll distance. The distance scroll-left or
  scroll-right will scroll.")
     (current-zoom-ratio
      1.0
      :type float
  