It is recommended that authors avoid positive values for the tabindex attribute because it is
brittle (any focusable elements added to the page without an explicit tabindex value greater than
zero will come last in the tab order) and can easily result in a page which is extremely difficult
to navigate, causing accessibility problems. Only use a tabindex of 0 for focusable elements.
This rule takes no options
<div tabIndex={0} />
<div tabIndex="0" />
<div tabIndex="-1" /><div tabIndex={1} />
<div tabIndex="1" />
<div tabIndex="2" />- This document from Chrome Accessibility Developer Tools.