Rough notes on Sara Soueidan's free chapter "Accessible notifications with ARIA Live Regions".
If you're linking to local elements via id you must ensure that they are focusable because otherwise assistive technology relying on "document.activeElement" can't follow the link target.
Should browsers ask you what you wanted to tap if you hit two elements?
A quick note about Manuel Matuzović's discovery of Safari not being able to focus zero-size elements.
It's common practice to sometimes overwrite an element's visual label with
aria-labelto provide more accessible information. As it turns out, this could break speech recognition software.