This isn't required either. Of course there's an xlcd for that: https://xkcd.com/936/
Besides,
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Using complexity requirements (that is, where staff can only use passwords that are suitably complex) is a poor defence against guessing attacks. It places an extra burden on users, many of whom will use predictable patterns (such as replacing the letter ‘o’ with a zero) to meet the required 'complexity' criteria.
https://www.ncsc.gov.uk/collection/passwords/updating-your-a...
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Seriously though, the best password boxes are one that have an entropy meter and check that your password has never been in a breach.
Oh, I'm well aware (with the concept and comic both). My passwords that I set for myself almost always are like that. It's just that I wasn't sure if OP was aware of it, due to what their site was asking.