Announce tabledrag warning message to Assistive tech

I previously tested all my Mac browsers with Voiceover (FF, Opera, Chrome, Safari), and I just tested Edge/Firefox/Chrome in Windows using Narrator/Jaws/NVDA. Adding the alert role functions identically to aria-live="assertive" (and thus works identically to Drupal.announce() set to assertive), so a role="alert" can be added to the element displaying the warning and it is accessible. Go ahead and change the role. It sounds like there were issues at some point with role="alert" when it was mentioned in that other issue in but as one would hope things improved in the decade that followed.

Looks like an error identification error handling issue to me https://www.w3.org/WAI/WCAG21/Understanding/error-identification

Thanks for the feedback, pretty clear on the next steps! Moving this to needs work.

@Lendude, since you marked this issue as postponed in #3 the only comment that possibly calls for any next steps are in #7. And the next steps are not clear to me, could you perhaps update the issue summary?

@nlisgo ha! good point, I miss read/remembered what needed to be done here.

So the conclusion in #6 was that role='alert' is fine, I thought the next step was to add that, but we already add that, so we don't need to do anything here, I think. So closing this. Please feel free to reopen this is you think there is still work that needs to be done here

@Lendude. Thanks for the quick followup. I was scratching my head on what the obvious next step was. I agree with outcome.

@mgifford I see you have tagged this issue wcag331 are you happy with this outcome?