[gregoriol]

There is no real benefit because the validation rules allowed there are often too limited for real use-cases anyway.

[epolanski]

What do you mean there's no real benefit?

You give the same error messages based on whatever custom validation and control the output.

[fkyoureadthedoc]

I've found it more annoying to mess with the browser validation API and using setCustomValidity/reportValidity etc. than to just use other validation libs. Ideally I'd use whatever library I want and they would call setCustomValidity for me though.

Using the related pseudo classes :valid, :invalid, :required, :optional is nice, but until last year you still had to do custom logic there because :user-valid/:user-invalid weren't implemented outside of Firefox. That created additional work and was annoying.

[endemic]

Do you have any examples?

[mock-possum]

Really? In my experience they easily cover the majority of cases - strings versus numbers, min and max length, upper and lower bounds to values, specifying what decimal level you’ll accept, you can even straight up provide a regex in the ‘pattern’ attribute.