A July 2, 2026 browser investigation reports React 19, React Router 7, Tailwind, Radix, TanStack Query, ProseMirror, and CodeMirror in ChatGPT web. This is an independent, dated observation, not an official dependency inventory or our own live verification.
Independent investigation of ChatGPT webDennis Brotzky's original inspection of delivered HTML, JavaScript, CSS, and network traffic. The author explicitly disclaims access to OpenAI's internal source repository.https://performance.dev/chatgpt
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