anchor.diff:  allow_elt(_) -> false.
   
   %% @doc Allowed attributes
  +allow_attr(Attr, Extra) ->
  +    allow_attr(Attr) orelse lists:member(Attr, Extra).
  +
   allow_attr(<<"align">>) -> true;
   allow_attr(<<"alt">>) -> true;
   allow_attr(<<"autoplay">>) -> true;
  
positive.code: %% @author Marc Worrell <marc@worrell.nl>
  %% @copyright 2009 Marc Worrell
  %% Date: 2009-04-17
  %%
  %% @doc Utility functions for html processing.  Also used for property filtering (by m_rsc_update).
  
  %% Copyright 2009 Marc Worrell
  %%
  %% Licensed under the Apache License, Version 2.0 (the "License");
  %% you may not use this file except in compliance with the License.
  
negative.code:             false ->
                  case skip_contents(Lower) of
                      false ->
                          {nop, [ sanitize(Encl, Stack, ExtraElts, ExtraAttrs, OptContext) || Encl <- Enclosed ]};
                      true ->
                          {nop, []}
                  end
  