Looks like the Edge team prototyped the ‘ARIA Notify API’ for an origin trial, available now in Edge 136.

Seems like this could be a cleaner solution for those times where you implement a visually-hidden live region solely to pass updates to screen readers. Interested in testing it out.

https://blogs.windows.com/msedgedev/2025/05/05/creating-a-more-accessible-web-with-aria-notify/