Worked on improving accessibility in the atomiks/base-ui repository by addressing an ARIA compliance issue within the Toggle Group component. Focused on front end development using React, JavaScript, and TypeScript, the work involved removing an invalid aria-orientation attribute from a container with role='group' to better align with ARIA best practices. To ensure ongoing compliance and prevent future regressions, comprehensive tests were introduced to verify correct ARIA attribute application. This targeted bug fix enhanced compatibility with assistive technologies, reduced the risk of accessibility violations, and maintained the intended user interface behavior without introducing unnecessary changes to the existing codebase.