i start tanki online and i have black screen i try downloading it again and waiting but nothing happened its just black screen
If you're talking about Client, try cleaning it's cache, you can find how to do it here: How to clean Tanki Online clients cache?
what if in browser?how can i fix it
because i also have black screen in my tanki.
Check this article to know more on how to clear the cache: How to clear your browser's cache?
Customer support service by UserEcho