Guideline 2.1
Keyboard Accessible
Users must be able to operate all functionality of apps with a keyboard interface. There should be no places where you get stuck when using assistive technologies. This includes the screen reader, voice control, switch control and external keyboard.
Success Criteria
- Success Criterion 2.1.1 - KeyboardKeyboardEnsure that all functionality in the app can be used with assistive technologies. 
- Success Criterion 2.1.2 - No Keyboard TrapNo Keyboard TrapEnsure users of assistive technologies can't get stuck anywhere in the app. 
- Success Criterion 2.1.3 - Keyboard (No Exception)Keyboard (No Exception)All functionality of the content must be operable through a keyboard interface without requiring specific timings for individual keystrokes. 
- Success Criterion 2.1.4 - Character Key ShortcutsCharacter Key ShortcutsEnsure that shortcuts cannot be accidentally activated when using assistive technologies.