Bad practices in usability, accessibility and UX
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Users might want to get an option writing F (female) or M (male) this format does not allow that. In addition, is harder to read given that the first 2 words are exactly the same.
Users with color blindness will not be able to detect errors if the message says "please correct the elements in red"
When username is taken the filled form is emptied and the user loses all the information
Allowing just one format when multiple variants are possible for usrs