Add muskitty-html5-parser to issue 661 (Project/Tooling Updates)

[Ink-dark]

Adding muskitty-html5-parser to the Project/Tooling Updates section of issue 661 (2026-07-22).

What

muskitty-html5-parser is an LLM-agent-built HTML5 parser written in pure Safe Rust:

• Tokenizer (WHATWG §13.2.5): 99.8% pass on html5lib tokenizer suite (7022/7036; the 14 failures are XML processing instructions, which the spec defines as parse errors)
• Tree construction (WHATWG §13.2.6): 100% pass on html5lib tree construction suite (1716/1716, including adoption agency algorithm, foster parenting, foreign content, and template insertion mode)
• Zero unsafe code, zero C/C++ dependencies

LLM Authorship Disclosure

Per TWIR's LLM policy, the core parser logic in this crate is LLM-generated. The human author wrote the project constitution (three rules: spec > WPT > Chromium, safe-first, spec-first) and the Python test-feedback loop; the LLM wrote the Rust implementation. Full disclosure with Rust-specific observations is in LLM_GENERATION.md.

Links

• crates.io: https://crates.io/crates/muskitty-html5-parser
• Source: https://github.com/muskitty-dev/muskitty-html5-parser
• LLM disclosure: https://github.com/muskitty-dev/muskitty-html5-parser/blob/main/LLM_GENERATION.md

[github-actions]

Thank you for your contribution to This Week in Rust! Our automated checks found some possible issues with these changes:

Link check

• warning: link https://crates.io/crates/muskitty-html5-parser is to crates.io -- we do not usually include links directly to crates on crates.io; please double check our guidelines here: https://github.com/rust-lang/this-week-in-rust#projectstooling-updates
• warning: link https://github.com/muskitty-dev/muskitty-html5-parser is directly to a GitHub repo; please double check our guidelines here: https://github.com/rust-lang/this-week-in-rust#projectstooling-updates

You can see more details here: https://github.com/rust-lang/this-week-in-rust/actions/runs/29590080080

[github-actions]

Thank you for your contribution to This Week in Rust! Our automated checks found some possible issues with these changes:

Link check

• warning: link https://github.com/muskitty-dev/muskitty-html5-parser#readme is directly to a GitHub repo; please double check our guidelines here: https://github.com/rust-lang/this-week-in-rust#projectstooling-updates

You can see more details here: https://github.com/rust-lang/this-week-in-rust/actions/runs/29591012048