Transparency is controlled by the alpha channel (
#AARRGGBB). Maximal value (255 dec, FF hex) means fully opaque. Minimum value (0 dec, 00 hex) means fully transparent. Values in between are semi-transparent, i.e. the color is mixed with the background color.
To get a fully transparent color set the alpha to zero.
BB are irrelevant in this case because no color will be visible. This means
#00FFFFFF (“transparent White”) is the same color as
#00F0F8FF (“transparent AliceBlue”). To keep it simple one chooses black (
#00000000) or white (
#00FFFFFF) if the color does not matter.
In the table you linked to you’ll find
Transparent defined as