> Every browser and platform implements slightly different font rendering engines, so it's expected that it will never look quite identical across platforms. If you need exact predictable font rendering, you have to use a sprite font.
how i use sprite font for persian language ?!?!?!?!
we cant make sprite font in persian look at this "hello" : "????"
the words are not seperate ! some of them are but not all !
That is a difficult situation! You probably wouldn't want to use sprite font in that case, but design your interface with rendering differences in mind, like giving your text some more padding and margins and using center align for positioning. As always, it is a little troublesome, but test your output on as many platforms as you can to find the best compromise.
For situations where pixel perfect rendering is absolutely necessary, I recommend using a graphics editor like Photoshop, Gimp, or Paint.net to render and export the words as images. It's not optimal and could take a lot of time though, so try to do so only as needed.