Question About Motor Disabilities and Menu Items

Hi,
In case I'm reading the guidelines incorrectly, I wanted to ask this question. I was reminded of it because in Chrome, you can press a button that brings up an apps page that contains menu items. With a screen reader you can arrow to them. If you are using NVDA, you can turn on Focus mode and use right and left arrows to go to the menu items. Here's the question. If someone has a motor disability, is the developer required to make it so that people with disabilities must be able to use the TAB key, arrow keys, both TAB and arrows, or one or the other to navigate among items they can interact with?

Thanks.

Jim


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