The article chronicles a week-long project where one developer teamed up with a language model to build a basic web browser from scratch. The aim was to create a browser that could render HTML and CSS without using JavaScript, all in under 72 hours. The developer set strict guidelines: no third-party Rust libraries, compatibility with Windows, macOS, and common Linux distributions, and a readable codebase. By the end of the project, they produced around 20,000 lines of code, demonstrating a functional browser capable of rendering a few websites, including the developer's blog and Hacker News. On the first day, the focus was on laying a solid foundation, starting with simple tasks like rendering "Hello World" and implementing nested tags. The developer introduced a screenshot feature to help the agent compare outputs, and regression tests were implemented to ensure consistency. The second day involved refining the rendering process, addressing window management issues, and enhancing text rendering. By the end of the third day, the browser featured scrolling, back button functionality, and cross-platform support. A final day was spent polishing the code and ensuring continuous integration worked seamlessly across all platforms. Key takeaways from the project include the effectiveness of one human collaborating closely with a single agent. The developer found that this approach yielded better results than relying on multiple agents, suggesting that the quality of human oversight matters significantly in the coding process. The project challenges the notion that scaling coding efforts requires throwing more agents at a problem, showing that a focused partnership can drive substantial progress in software development.