2.1.5 [CSS3Color:2011] Section 4.2.3, ‘transparent’ color keyword

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V0008:

The specification states:

 transparent
 Fully transparent. This keyword can be considered a shorthand for transparent 
 black, rgba(0,0,0,0), which is its computed value.

Quirks Mode, IE7 Mode, and IE8 Mode (All Versions)

The transparent keyword is not supported.