voiceover

% /System/Library/CoreServices/VoiceOver.app/Contents/MacOS/VoiceOver -h
Framework Version: 708.13

Usage: VoiceOver <subcommand> [options...]

  -h -- Help.
  -k -- Keyboard Help.
  -l logmask -- A comma separated list of log masks (mask1,mask2,...).
  -p -- Do not show splash screen.
  -q -- Quick start.
  -t appname -- A comma separated list of application names to target.
  -v -- Version information.
  -L -- This screenreader is meant to run at login time.
  -T testTarget -- A comma separated list of the process identifiers of the applications that will be tested with VoiceOver.
  -a -- Automatic start at login

Available subcommands:
    launchd

2020-06-20 11:55:08.193 VoiceOver[3949:366111] VoiceOver could not toggle keep alive: 
2020-06-20 11:55:08.194 VoiceOver[3949:366111] SCREENREADER[3949]: Someone has already checked in my running label. Exiting.
2020-06-20 11:55:08.454 VoiceOver[3949:366111] VoiceOver could not toggle keep alive: ```

default	12:29:57.768644-0400	VoiceOver	SCREENREADER[4454]: VoiceOver was not launched by UA daemon as expected.

/System/Library/LaunchAgents/com.apple.VoiceOver.plist: Operation not permitted while System Integrity Protection is engaged```

(com.apple.xpc.launchd.domain.user.501): Service "com.apple.xpc.launchd.unmanaged.VoiceOver.749" tried to register for endpoint "com.apple.VoiceOver.running" already registered by owner: com.apple.VoiceOver

sudo launchctl debug gui/$UID/com.apple.VoiceOver --stderr --stdout -- /System/Library/CoreServices/VoiceOver.app/Contents/MacOS/VoiceOver -p -q -k

This will scope the next launch of VoiceOver to Safari only:

sudo launchctl debug gui/$UID/com.apple.VoiceOver -- /System/Library/CoreServices/VoiceOver.app/Contents/MacOS/VoiceOver -p -t Safari launchd -s

sudo launchctl debug gui/$UID/com.apple.VoiceOver -- /System/Library/CoreServices/VoiceOver.app/Contents/MacOS/VoiceOver -p -t Safari launchd -s; /System/Library/CoreServices/VoiceOver.app/Contents/MacOS/VoiceOverStarter