These passwords were created just for you and are unique.
The script that generates these passwords runs in your own web browser on your own computer.
These passwords never traveled over the internet during their creation.
The web server that serves this page never sees these passwords.
A cryptographically secure random number generator was used to create these passwords.
Your browser does not support cryptographically secure random number generation. It is possible that somebody could guess these passwords if they knew the precise millisecond that you used this page.
xkcd comic: Password Strength
This is why you should use random words for passwords. "Tr0b4dor&3": easy to guess and hard to remember. "correct horse battery staple": difficult to guess and you've already memorized it.