Keyboard navigation is a way of interacting with a web application using only the keyboard, without a mouse or a touch screen. Keyboard navigation is essential for users who have visual impairments, motor disabilities, or other accessibility needs. Keyboard navigation also benefits users who prefer to use the keyboard for efficiency or convenience. One of the aspects of keyboard navigation that can be tested for accessibility is the tabbing order, which is the order in which elements on a page receive focus when the user presses the Tab key. The tabbing order should be logical, meaning that it follows the natural reading order of the page and the expected user workflow. A logical tabbing order helps users navigate the page easily and intuitively, without skipping or repeating elements. A logical tabbing order also helps screen readers announce the elements in a meaningful sequence. Therefore, testing the tabbing order for logic is a way of verifying keyboard navigation for accessibility. The other options are not related to keyboard navigation. Keyboard actions do not provide audio feedback by default, although some screen readers may have this feature. Actionable items are not highlighted in a specific color, although they may have a visible focus indicator, such as a border or an outline, to show which element has focus. The color of the focus indicator is not a factor for keyboard navigation, as long as it is distinguishable from the background. References: Keyboard Shortcuts, Use Lightning Experience with a Screen Reader, Accessibility in LWR Sites