A11ying with Sanna - Web Content Accessibility Guidelines a guide to the accessibility requirements
2 Operable

2.1 Keyboard Accessible

Make all functionality available from a keyboard.

2.1.1 Keyboard

Conformance level: A

Ensure all functionality is operable through a keyboard interface.

2.1.2 No Keyboard Trap

Conformance level: A

Ensure keyboard focus is not trapped in any part of the content.

2.1.3 Keyboard (No Exception)

Conformance level: AAA

Ensure all functionality is operable through a keyboard without exception.

2.1.4 Character Key Shortcuts

Conformance level: A

Ensure that single-character key shortcuts can be turned off or remapped to use non-printable key combinations (such as Ctrl or Alt + key). Additionally, provide a way to disable these shortcuts.