[error.bg_order] CSS Validator Translation

Property:
  error.bg_order

Text in English:
  In the CSS3 background definition, 'bg_position' must occur before / 'bg_size' if both are present

Language:
  pt-BR

Translation:
    Em CSS3 ao definir valores para a propriedade background o valor 'bg_position' deve preceder o valor 'bg_size' se ambos estiverem presentes na declaração.  

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