Worked on stabilizing Web Platform Tests related to focus management in the mozilla/gecko-dev repository. Addressed a persistent issue where assertion failures inside click handlers caused test timeouts by wrapping the event handler in t.step_func(), ensuring proper assertion handling and reducing flaky failures. This technical approach improved the reliability and determinism of continuous integration results for web platform testing. Utilized skills in Web Platform Testing and HTML to implement the fix, and documented best practices for using t.step_func() in focus-management scenarios. The work focused on bug resolution and contributed to more maintainable and predictable test outcomes for the project.