Koklowski contributed targeted corrections to the mdn/browser-compat-data repository, focusing on improving the accuracy and consistency of Opera browser compatibility data. Working primarily with JSON and leveraging expertise in browser compatibility data management, Koklowski addressed inaccuracies in CSS properties, HTML attributes, and HTTP headers, such as box-decoration-break, speak, fieldset.disabled, and Cross-Origin-Opener-Policy. The work included renaming internal properties to align with established naming conventions, thereby enhancing data reliability for developers. Delivered through traceable commits, these changes improved the quality and maintainability of the compatibility dataset, reducing confusion and supporting more consistent cross-browser development practices.