2.1.2 [W3C-CSS3-Color] Section 3.2, Transparency: the ‘opacity’ property

V0003:

The specification states:

 Name: opacity
 Value: <alphavalue> | inherit 
 Initial: 1 
 Applies to: all elements 
 Inherited: no  
 Percentages: N/A 
Media: visual
Computed value: The same as the specified value after clipping the <alphavalue> to the range [0.0,1.0].

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

The opacity property is not supported.

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