TextFormat class represents the character formatting information, e.g., color, font size, and underlining.
alpha property
alpha:Number [read-write]
Scaleform version: 2.0.41
Controls the alpha transparency value for the text as a percentage value. Valid values are 0 to 100 (%). Standard Flash TextFormat.color doesn’t allow an alpha transparency to be set, so this extension could be used to make text partially or completely transparent.
See also:
TextFormat HTML <FONT ALPHA='xx'>