android.moparisthebest.org/source/stylesheets/library/_opacity.sass

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//**
Provides cross-browser css opacity.
@param !opacity
A number between 0 and 1, where 0 is transparent and 1 is opaque.
=opacity(!opacity)
:opacity= !opacity
:-moz-opacity= !opacity
:-khtml-opacity= !opacity
:-ms-filter= "progid:DXImageTransform.Microsoft.Alpha(Opacity=" + round(!opacity*100) + ")"
:filter= "alpha(opacity=" + round(!opacity*100) + ")"
// Make an element completely transparent.
=transparent
+opacity(0)
// Make an element completely opaque.
=opaque
+opacity(1)