I am curious how you should approach the design of notification functionality with screen readers in mind.
Let's take Facebook as an example. If someone comments on one of your posts. A little popup notification appears in the bottom left corner of the application. Visually interrupting your current process.
What is the equivalent for screen readers?
I imagine it would be very disorientating to have an audio bite suddenly play to alert you of the update. However without some interruption how would you know to check your notification feed to action the latest notification?
Similarly how do screen readers interpret the little 'new notification' badges that often display a number. Do they just read the number out immediately after the notifications menu item title? Is there a best practice standard for designing these patterns for compliance with screen readers?