# mbrubeck/robinson

A toy web rendering engine

Repository: https://github.com/mbrubeck/robinson
Canonical: https://ross.abutalabs.com/products/robinson
Homepage: http://limpet.net/mbrubeck/2014/08/08/toy-layout-engine-1.html
Language: Rust
License: MIT
License Family: permissive
Last push: 2024-07-16T23:41:43+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4444, "days_push": 778, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1651, forks 142 (observed 2026-08-28T04:05:16.934523+00:00)

## What it is
Robinson is a toy web rendering engine written in Rust, built purely for educational purposes to demonstrate how browser engines work. It implements a small subset of HTML/CSS parsing, selector matching, and block layout, accompanied by a blog tutorial series.

## Use cases
- learn how a browser rendering engine works
- build my own toy browser engine
- study html and css parsing in rust
- understand css selector matching and layout algorithms
- teaching material for compilers or browser internals

## When to choose
- you want to learn browser engine internals from simple, readable code
- you are following the 'Let's build a browser engine!' tutorial series
- you want a minimal starting point for your own toy engine project

## When to avoid
- you need a real, standards-compliant rendering engine
- performance, security, or real-world usability matter
- you need full HTML/CSS support or JavaScript execution

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: parser, graphics, developer-tools
- domain: web-development, education, tutorials
- platform: rust, cross-platform, cli
- tags: browser-engine, html-parser, css-parser, layout-engine, toy-project, educational

## Member repositories
- mbrubeck/robinson (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:16.934523+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:45:02.664280+00:00, confidence not recorded.
  - readme: https://github.com/mbrubeck/robinson (fetched 2026-08-28T04:05:16.934523+00:00, sha af34c91c2868)
  - homepage: http://limpet.net/mbrubeck/2014/08/08/toy-layout-engine-1.html (fetched 2026-08-29T11:18:05.782292+00:00, sha c045bbae3138)
- Data as of 2026-08-30T08:39:29.467469+00:00.