Applies alpha channel transparency to text.
This property value can range from a default value of 0 (total opacity) to a value of 255 (total transparency). A value entered out of this range produces either a value of 0 or a value of 255, whichever is closer to the entered value.
Below you can see a sample of two identical buttons, the left one with the property set to 0 (total opacity) and the right one with the property set to 128.
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