anchor.diff:  			 content-type (symbol-name encoding))))
   
   (defun html-widget-head (title &key stylesheets scripts feeds
  -			 (encoding *default-encoding*))
  +                         (encoding *default-encoding*)
  +                         (viewport *default-viewport*))
     "*Arguments and Values:*
   
      _title_—a _string_.
  
positive.code:    _viewport_."
    (head
     (html-widget-meta :encoding encoding)
     (when title
       (title title))
     (dolist (stylesheet stylesheets)
  
negative.code: 
     _encoding_—a _keyword_ denoting a character encoding. The default is
     {:utf-8}.
  
     _viewport_—a _string_ denoting the value of a {viewport} meta
     attribute. the default is {\"width=device-width, initial-scale=1\"}.
  
     *Description:*
  
  