Worked on the tc39/ecma262 and tc39/test262 repositories, focusing on standardization and testing improvements for JavaScript environments. Delivered a specification update that allows host environments to create ordinary global objects, enhancing interoperability and reducing integration friction across realms. This involved editing specification language and validating changes through the standardization process. Additionally, addressed a targeted bug in the Temporal API test suite by updating test descriptions and logic to accurately reflect ROC to ISO8601 conversions, improving test reliability. Demonstrated skills in JavaScript, specification development, and testing, with careful attention to standards compliance and maintainability throughout the two-month period.