 TandemConstants.LINE_ATTRIBUTES = [].concat(_.keys(TandemConstants.INDENT_ATTRIBUTES), TandemConstants.ALIGN_ATTRIBUTES).sort()
 
 TandemConstants.SPAN_ATTRIBUTES =
-  'author'          : TandemConstants.AUTHOR_COLORS
   'background' : TandemConstants.FONT_BACKGROUNDS
   'color'      : TandemConstants.FONT_COLORS
   'family'     : TandemConstants.FONT_FAMILIES

  ]

  DEFAULT_LEAF_ATTRIBUTES:
    'author'     : 'anonymous'
    'background' : 'white'
    'color'      : 'black'
    'family'     : 'san-serif'

    'justify'
    'left'
    'right'
  ]

  BLOCK_TAGS: [
