Contributed a targeted update to the mdn/browser-compat-data repository by delivering Bun runtime compatibility data for File, Resource Timing, and JSTag features. Focused on enhancing data accuracy, the work involved mapping specific Bun versions to their respective feature support, ensuring downstream documentation and compatibility matrices reflect up-to-date information. Leveraged skills in API development, compatibility analysis, and data management, utilizing JSON to structure and integrate the new data. The approach emphasized clarity and maintainability, providing a foundation for future compatibility tracking. This work addressed the need for precise runtime support data, supporting developers and documentation teams in referencing accurate compatibility information.