What would prevent a website from not allowing special characters when you create a password and require only alphanumeric?
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Whatever text you enter a computer then has to handle in order to make useful. If you are very, very clever about how you enter text in an online form (even a password field) you can trick the computer into thinking it’s code to execute instead of a form response; if you can do that you can make it do all kinds of things the people who built the form don’t want it to do.
However there are plenty of well-known and documented ways to prevent this. Any website in the year of our lord two thousand and twenty two that still prohibits special characters is just being too lazy to make sure they’re sanitizing their inputs properly.
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