Anssi Kostiainen developed the Background Geolocation feature for the w3c/charter-drafts repository, shifting focus from the Geolocation Sensor deliverable to better align with developer demand and feedback from the WebApps Working Group. He applied skills in API design, web development, and collaboration to define a clear, scoped feature set, documenting the rationale for these changes in both commits and meeting minutes. By removing the Geolocation Sensor deliverable and moving new use cases to the Geolocation specification, Anssi reduced scope drift and clarified the project roadmap. His work, primarily using HTML, improved stakeholder clarity and set a foundation for future discussions.