Simon Willison 12/14/2025

JustHTML is a fascinating example of vibe engineering in action

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The article reviews JustHTML, a pure Python HTML5 parser library with full test suite compliance. It details the author's initial impressions and then explores how the library's creator used AI coding agents (like GitHub Copilot, Claude, and Gemini) over several months, framing the process as sophisticated 'vibe engineering' rather than simple 'vibe coding'.

JustHTML is a fascinating example of vibe engineering in action

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