Use VoiceOver to navigate webpages using live regions on Mac
Webpages can contain areas, called “live regions,” whose content is updated without refreshing the entire page. VoiceOver can detect live regions, even when the focus is elsewhere on a webpage, and speak the content in the live region as it changes.
Note: VO represents the VoiceOver modifier. See Use the VoiceOver modifier.
Enable all live regions
Open VoiceOver Utility (press VO-F8 when VoiceOver is on).
Click the Web category, then select Enable Live Regions.
Enable a specific live region
If live regions are listed in the VoiceOver rotor when viewing webpages, you can enable a specific live region.
Use the VoiceOver rotor to move to a live region.
Press the O key to turn the live region on or off.