class Peta.Element extends Peta.ElementNestableContent
  merge_opacity: (style_hash, opacity) ->
    _.extend(style_hash, {
      opacity: opacity/100, 
      filter: 'alpha(opacity=' + Pettanr.to_s(opacity) + ')'
    })
  
  label: (shorten_length) ->
    @_label('caption', shorten_length)