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Important to note that in the article we mention we only use pattern to trigger the right keyboard in old iOS. We actually turn off HTML validation in favour of doing server side validation, we'll soon be publishing guidance on that too. Disclaimer - I work on the team.

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Why are you going to server-side only? I've always held that client-side validation is important for UX as it provides instant feedback and doesn't need any extra work to preserve the other data that's already been input. Obviously the inputs still need to be validated on the server e.g. to protect against things that get past (or bypass) the client-side checks, or perform more expensive validation.

We'll be publishing soon on the GOV.UK Design System, but in summary we can't make browser validation consistent with our Design System, or guarantee it's always accessible.

In our research it's commonly most often helpful to validate when the user submits as that's when you can be sure they're 'done'. There are cases when realtime helps so it's fine to add it in those situations.

Disclosure* - you're claiming to be on the team, not disclaiming it.

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