Stephen Choi authored the Stable Element Selectors Best Practices for Web Experiments in the amplitude-docs repository, focusing on improving the reliability and maintainability of web experiment infrastructure. He developed comprehensive documentation that standardizes the use of CSS selectors and HTML attributes, addressing the common issue of flaky experiments caused by unstable element targeting. By introducing clear guidelines and a maintainable approach, Stephen enabled contributors and auditors to more easily review and comply with selector usage standards. His work, delivered as a single, well-documented commit, emphasized traceability and auditability, leveraging his expertise in CSS, HTML, and technical documentation practices.