     'justify'
     'left'
     'right'
-  ]
-
-  AUTHOR_COLORS: [
-    'anonymous'
   ]
 
   BLOCK_TAGS: [

  ]

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

TandemConstants.LINE_ATTRIBUTES = [].concat(_.keys(TandemConstants.INDENT_ATTRIBUTES), TandemConstants.ALIGN_ATTRIBUTES).sort()

TandemConstants.SPAN_ATTRIBUTES =
  'background' : TandemConstants.FONT_BACKGROUNDS
  'color'      : TandemConstants.FONT_COLORS
  'family'     : TandemConstants.FONT_FAMILIES
