Tooltips and SC 4.1.3

Hi,

 

An input-field displays a popup-hint on focus with role=tooltip.

The hint is not referenced with aria-describedby.

Thus, when tabbing to the input-field, a screen reader  doesn't announce the
hint.

Pressing Arrow-Down, the hint is announced.

 

Is this a failure of 4.1.3 (status messages)?

Understanding 4.1.3 does not mention tooltips explicitly.

https://www.w3.org/WAI/WCAG22/Understanding/status-messages.html 

 

Or is this a change of content according to SC 3.2.1 On Focus? 

https://www.w3.org/TR/WCAG22/#dfn-change-of-context

 

Or is it *just an usability problem or poor design*?

 

SC 1.4.13 Content on Hover or Focus covers other issues

 

Thanks for clarification!

 

Wolfgang