Image: reddit.com · I built a web browser from scratch in Rust with Claude Code — 91%+ WPT compliance, 97.8% ECMAScript, and 100% WebAssembly. No Chromium, no WebView.
T.A.B., a web browser written from scratch in Rust
A headless-first browser engine with its own JavaScript engine, JIT, DOM and WebAssembly runtime, built over months with Claude Code.
Credits
- Reddit poster PhallicPorsche Source ↗
Earliest dated source:
The full story
The poster spent months building a browser from scratch in Rust with Claude Code helping: its own JavaScript engine, bytecode VM, JIT compiler, DOM, CSS layout and painting, and WebAssembly runtime. It is designed to be headless-first so agents can operate it.
They report 91.43% on WPT testharness, 97.83% on Test262 and 100% on WebAssembly, noting that some results are inherited from earlier runs. Screenshots show real pages such as Google and HEY rendering in the engine.
How it was done
Tools
Themes
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Sources
From a short post by the maker, so the details are as they tell them.
- Reddit: I built a web browser from scratch in Rust with Claude Code — 91%+ WPT compliance, 97.8% ECMAScript,Reddit poster: PhallicPorschePosted
The maker's post on r/ClaudeAI.
If it disappears: archived copy of Reddit: I built a web browser from scratch in Rust with Claude Code — 91%+ WPT compliance, 97.8% ECMAScript, (opens in a new tab)
- Reddit: I built a web browser from scratch in Rust with Claude Code — 90%+ WPT compliance, 97.8% EReddit poster: PhallicPorschePosted
If it disappears: archived copy of Reddit: I built a web browser from scratch in Rust with Claude Code — 90%+ WPT compliance, 97.8% E (opens in a new tab)