Daniel Hritzkiv contributed to browser compatibility and type safety in two open-source projects over a two-month period. For mdn/browser-compat-data, he updated compatibility data to reflect support for input type="week" on iOS Safari 18.2 and later, ensuring developers relying on MDN have accurate, up-to-date information. His work involved careful alignment with evolving web standards and browser features using JSON and TypeScript. In grafana/k6-DefinitelyTyped, Daniel fixed a bug in the Range class, correcting comparison method return values to improve type definitions and downstream reliability. His contributions demonstrated attention to detail and a focus on standards compliance and maintainability.