Operable 2.1 Keyboard Accessible

Make all functionality available from a keyboard.

Examples

All tabbable elements have a visible focus state.
Users can open and close modals and popups without the use of a mouse or touchpad.
Interactive components on the page use the button element (no divs).

Depending on which level of compliance your website needs, the following criteria needs to be met.
Criterion	Level	Description
2.1.1	A	All content must be accessible using a keyboard as the only input method.
2.1.2	A	A user must be able to navigate away from a component using a keyboard only.
2.1.3	AAA	All content is operable without requiring specific timings of keystrokes.
2.1.4	A	If a keyboard shortcut is implemented using a single character, then users must be able to turn off the shortcut, remap the shortcut, or only activate the shortcut when the component receives focus.