Worked on the web-infra-dev/midscene repository to address a critical issue with Puppeteer window sizing in browser automation workflows. Focused on improving cross-environment reliability by ensuring the windowSize parameter is only applied in headed mode and removing hardcoded offsets that previously caused inconsistent UI rendering. Enhanced test stability by refining browser context sharing and aligning viewport sizing, while also simplifying device scale factor handling by adopting Puppeteer defaults. Utilized TypeScript and web development best practices to clean up CLI interfaces and code style, resulting in more maintainable automation scripts and reducing flakiness in end-to-end testing across different environments.