html5ever

I haven't really looked at the fastrender project to say how much of a browser it implements itself, but it does depend on at least one servo crate: cssparser (https://github.com/servo/rust-cssparser). Maybe there is a main servo crate as well out there, and fastrender doesn't depend on that crate, but at least in my mind fastrender depends on some servo browser functionality. EDIT: fastrender also includes the servo HTML parser: html5ever (https://github.com/servo/html5ever).

I think it's fair enough to consider porting a subset of rewriting, in which case there are several successful experiments out there: - JustHTML [1], which in practice [2] is a port of html5ever [3] to Python. - justjshtml, which is a port of JustHTML to JavaScript :D [4]. - MiniJinja [5] was recently ported to Go [6]. All three projects have one thing in common: comprehensive test suites which were used to guardrail and guide AI. References: 1. https://github.com/EmilStenstrom/justhtml 2. https://friendlybit.com/python/writing-justhtml-with-coding-... 3. https://github.com/servo/html5ever 4. https://simonwillison.net/2025/Dec/15/porting-justhtml/ 5. https://github.com/mitsuhiko/minijinja 6. https://lucumr.pocoo.org/2026/1/14/minijinja-go-port/