Feedback on new aria-invalid guidance for spin button

Per our discussion a couple weeks ago of issue 704 which asks questions
about the spin button pattern, I created pull request 825 which proposes the
following language for the roles, states, and propertie section of the spin
button pattern:

 

"The spinbutton element has aria-invalid set to true if the value is outside
the allowed range. Note that most implementations prevent input of invalid
values, but in some scenarios, blocking all invalid input may not be
practical."

 

Before I merge, I'd like some feedback. Is the language clear or does it
neeed any changes? Please comment in the PR:

https://github.com/w3c/aria-practices/pull/825

 

Thanks,

Matt