[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:
  es

Translation:
En la definición de fondo de CSS3, "bg_position" debe aparecer antes que
"bg_size" si ambas están presentes

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