Opacity/ar
From xat wiki
(OPACITY) - تغيير عتامة ابتسامتك
Opacity is a function power that allows you to change the opacity of your smilies.
To use this power, add #opacity#w5-100 to your smiley code.
Any value from 5 through 100 can be used, which represents the percentage of opacity, for example #w50 would make the smiley only 50% visible.