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