An individual, leveraging an LLM agent, built a functional web browser from scratch in approximately 70 hours. The project, detailed on Hacker News, involved rendering HTML and CSS, but excluded JavaScript support. The goal was to prove the feasibility of such a project with minimal external dependencies, using only the OS's native tools.

The project's origins stem from a challenge to see how quickly a browser could be developed using the power of an AI agent. The developer set strict constraints: no third-party Rust libraries, and cross-platform compatibility across Windows, macOS, and Linux. This approach aimed to showcase the potential of AI-assisted development in a practical, real-world context.

Starting with a simple "Hello World" rendering, the browser evolved to support nested tags, screenshots, and basic link clicking. The agent assisted in the code generation, with the developer focusing on testing and integrating the results. The final product, written in around 20,000 lines of code, demonstrates the potential of AI in software development.

Next steps might involve expanding the browser's capabilities and exploring more complex features. The project highlights the increasing role of AI in accelerating software development cycles, potentially shifting how engineers approach building complex applications. The source code is available on GitHub for others to experiment with.