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When you use rgba as a color, the expresion is not recognized and show an error. Value Error : text-shadow Too many values or values are not recognized : 0 1px 0 rgba(255,255,255,0.4 )
Fixed with new code. Css3 version correspond to http://www.w3.org/TR/2012/WD-css3-text-20120814/#text-shadow0