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Dev Tutorial: Building a Fully Accessible Vertical React Navigation Component

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A developer has completed a multi-part series documenting the creation of a fully accessible main navigation component in React, with the final article focusing on vertical layout support. The component is designed to work in both horizontal desktop and vertical mobile arrangements, and can operate in controlled or uncontrolled states. Key changes for vertical mode include keeping sublists open when focus shifts to a parent's sibling and remapping arrow key behavior to mirror Tab and Shift+Tab navigation. The orientation prop is stored in a NavigationProvider config object, enabling the component to detect and adapt to its layout type at runtime. All code is written in TypeScript targeting React 19, uses vanilla CSS, and is publicly available on GitHub under release 1.0.0.

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