NSAccessibilityMarkedMisspelledTextAttribute

Misspelled text that is visibly marked as misspelled (NSNumber as a Boolean value). If you’re implementing a custom text-editing app, use NSAccessibilityMarkedMisspelledTextAttribute to ensure that VoiceOver properly identifies misspelled text to users.

extern NSAttributedStringKey const NSAccessibilityMarkedMisspelledTextAttribute;