17 Mar 2026javascriptclauderustagentic-codingIn January, I came across a blog post by the author of one-agent-one-browser, a from-scratch browser built in Rust by a single person directing a single coding agent over a few days. No JavaScript support, though. I read it and thought: "How hard can it be to build a JavaScript engine the same way?"Six weeks later, JSSE (JavaScript Simple Engine) became the first JavaScript engine I know of to pass 100% of test262 non-staging tests: all 98,426 scenari...