If you support unicode you can d̸͍̳̣̱̼̞̠̝͚̽͑̀̾̈́̎̇̀͂̆̀̚͟͜ͅò̸̧̻̩̲͈̭͎͎̗̝̫͉̓̕͠ ̴̝̜̻̝̹̘̺͜͠a̶̛̱͙͙̭̟͍͍̟̫͎͉͐͌͂̎̇͊̈́͋̇̔̈̏̚l̵̢̜͉̩͍̯̯̤͔̪̲̟͈̅̌̉̏̾͑̓͂͆̀̐͂͟͟͡ļ̷̜̥͍͓͉͈̮̻̰̘̹̣̒͌̒̑̅͂͐̏̾̓̀̽͟͝͡ ̷̡̛͚̻̪͈͕̭̪͎̪̎͑́̆͑͂̉͑͜͠🄺🄸🄽🄳 🄾🄵 𝔴𝔢𝔦𝔯𝔡 𝓈𝓉𝓊𝒻𝒻.
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Yes, if you support Unicode fully you’ll support Arabic automatically. There are RTL code points that will switch text direction automatically. Browsers support this at the html and css level. There’s a bunch of different ways.
If you won't provide any details no one will be able to help you.
yes
Linux supports Unicode usernames. However, bidirectional rendering is application-specific. I have not tried this myself, so I'm not sure what happens. Also, I'm not sure whether the bidirectional markers are canonicalized away, so the input method likely matters too.
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