Keyboard accessibility if menu can be operated with keyboard should it still retain tabbing functionality?

1. How do I make my element keyboard accessible?
2. What is the importance of keyboard accessibility?
3. Does interactive elements must be able to be activated using a keyboard?

How do I make my element keyboard accessible?

Give the element a tabindex="0" attribute to make it focusable and appear in the tab order according to its location in the DOM.

What is the importance of keyboard accessibility?

Keyboard accessibility is critical to ensure all users have access to information without requiring a mouse. To be keyboard accessible a web page must not only be keyboard operable it must also incorporate the following: a visible keyboard focus, appropriate tab order, and avoid keyboard traps.

Does interactive elements must be able to be activated using a keyboard?

Interactive elements must be able to be activated using a keyboard. If the user can interact with an element using touch or a pointing device, then the element should also support interacting using the keyboard.