Contributed to the microsoft/accessibility-insights-web repository by delivering accessibility improvements and security updates within a one-month period. Enhanced the Test Details section by replacing improper table semantics with semantic unordered and list item elements, improving screen reader compatibility while preserving the visual layout using CSS multi-column techniques. Addressed security vulnerabilities by upgrading react-router-dom and related ecosystem packages, ensuring compliance with recent CVEs. Maintained code quality through updated unit tests, snapshot verification, and comprehensive coverage checks using JavaScript, TypeScript, and React. The work focused on both user experience and application security, demonstrating attention to accessibility standards and robust front end development practices.