The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.
10.9k
Stars
23.2k
Forks
547
Open issues
30
Contributors
AI Analysis
MDN Web Docs is the official, open-source documentation hub for web technologies (HTML, CSS, JavaScript, Web APIs, HTTP) maintained by Mozilla and a global community of ~45,000 contributors. It serves web developers, students, and beginners seeking authoritative learning resources and comprehensive reference material, with localization in seven languages beyond English. This is a specialized reference platform for web developers—not a general-purpose tool—and is not intended for non-web-devel...
Inferred from signals mentioned in the README (tests, CI, type safety) — not a review of the actual code.
AI's overall editorial judgment — not an average of the bars above, can weigh other factors too.
MDN Web Docs content repository: the canonical reference for web platform documentation used by millions of developers daily
mdn/content is the source repository for MDN Web Docs (developer.mozilla.org), housing over 14,000 English-language reference and learning pages covering HTML, CSS, JavaScript, HTTP, and Web APIs. It is used primarily by web developers worldwide as a reference, and contributed to by a global community of 45,000+ contributors since 2005. It matters because it represents the de facto standard documentation layer for the open web platform, maintained collaboratively under Mozilla stewardship.
MDN Web Docs originated in 2005 as the Mozilla Developer Network wiki. This GitHub repository was created in September 2020 as part of a major architectural migration away from a wiki-based CMS to a Git/Markdown-based content pipeline, greatly lowering the barrier for contributions.
Star growth is slow (8 stars in the last 7 days) and modest overall at ~10,800, which is expected: developers use MDN as a live website, not a GitHub project they star. The fork count of 23,192 — significantly exceeding star count — is a strong signal of active contribution activity. Growth is driven by ongoing web platform evolution (new APIs, CSS features, JS proposals) requiring constant documentation updates.
developer.mozilla.org receives hundreds of millions of page views per year and is consistently ranked among the top developer documentation resources globally. The content in this repository directly powers that site. Real-world adoption is extensively verified at scale.
Appears to be a flat Markdown-file content repository organized by web technology topic areas. Likely uses a separate rendering/build system (Yari, referenced via npm scripts) that processes Markdown into the published MDN website. The local preview server runs on port 5042, consistent with the Yari toolchain. Content and platform are decoupled — this repo holds only authored content.
Not documented in README. Given the content-centric nature, 'tests' likely refer to linting, link validation, and frontmatter schema checks rather than traditional code tests, but specifics are not described in the README.
Extremely active. Last push was June 22, 2026 — two days before the evaluation date. Given the volume of web platform changes and the contributor community size, daily or near-daily commits are expected and consistent with observed push frequency. Maintenance signals are strong.
ADOPT IF: you need the canonical, community-maintained reference for any web platform technology (HTML, CSS, JS, Web APIs) — either as a reader or as a contributor improving documentation accuracy. AVOID IF: you need opinionated tutorials, framework-specific guidance (React, Vue, etc.), or backend/server-side documentation outside HTTP — MDN deliberately stays web-platform-scoped. MONITOR IF: you are tracking the health of open web platform documentation infrastructure, particularly as AI-generated content risks and Mozilla funding shifts could affect editorial quality over time.
Independent dimensions
Mainstream potential
10/10
Technical importance
8/10
Adoption evidence
10/10
- Mozilla's organizational and financial instability has historically created uncertainty about long-term stewardship of MDN; future funding cuts could reduce paid editorial staff.
- The high contributor volume increases the risk of subtle inaccuracies, outdated examples, or inconsistent editorial quality across 14,000+ pages — quality control at this scale is inherently challenging.
- AI-generated content spam and low-quality automated pull requests are an increasing moderation burden for large open documentation repositories.
- MDN's scope is explicitly limited to the open web platform; it may appear incomplete to developers working across the full stack, potentially driving fragmentation toward competing documentation aggregators.
- Browser compatibility data accuracy depends on coordination with the separate mdn/browser-compat-data repository; drift between the two repos could introduce misleading compatibility claims.
mdn/content will remain the central reference layer for the open web platform for the foreseeable future. Contribution activity will likely remain high as the web platform continues to expand, though editorial governance and AI-content moderation will become increasingly important operational challenges.
Newsletter
Get analyses like this every Monday
Free weekly digest of the most interesting open-source discoveries.
Languages
Information
- Website
- https://developer.mozilla.org
- Language
- Markdown
- License
- NOASSERTION
- Last updated
- 2d ago
- Created
- 71mo ago
- Analyzed with
- anthropic/claude-haiku-4-5
Stars over time
Contributors over time
Top 100 contributors only — repos with more will plateau at 100.
Open issues
Top contributors
Recent releases
No releases published yet.
Similar repos
mdn/translated-content
The translated-content repository maintains community-driven translations of...
cloudflare/cloudflare-docs
This is Cloudflare's open-source developer documentation repository written in...
| Repository | Stars | Week Δ | Language | Score | Updated |
|---|---|---|---|---|---|
|
mdn/content
this
|
10.9k | +12 | Markdown | 9/10 | 2d ago |
|
mdn/translated-content
|
2k | — | Markdown | 7/10 | 2d ago |
|
cloudflare/cloudflare-docs
|
4.9k | — | MDX | 8/10 | 14h ago |
|
mdn/dom-examples
|
4k | — | JavaScript | 7/10 | 1w ago |
|
mdn/yari
|
1.3k | — | TypeScript | 7/10 | 1w ago |
 docmd-io/docmd
|
2.1k | — | TypeScript | 8/10 | 21h ago |
The companion localization repository for MDN in 7+ languages. Complementary, not competing — together they cover the full multilingual MDN content surface.
Google's developer documentation covers overlapping web platform topics but emphasizes best practices and guidance over exhaustive API reference. MDN is broader in API coverage; web.dev is more opinionated and tutorial-focused.
Authoritative but written for specification authors, not developers. MDN translates spec-level definitions into practical, example-rich developer documentation.
A similarly large documentation repo for a single product. MDN covers the entire open web platform rather than one vendor's tool, giving it broader scope and relevance.
Covers the Node.js runtime specifically. MDN and Node.js docs are frequently used together by JS developers; they serve adjacent but distinct audiences.
