SourceScore
Reference

MDN Web Docs

developer.mozilla.org ↗

Mozilla-stewarded web-platform reference since 2005; default citation for HTML, CSS, JS, Web APIs.

SourceScore Index
A·93Composite weighted across Discipline, Modern Reference, and Velocity.

A — gold-standard web-platform reference with full open access + machine-readability.

Citation Discipline
A·92

Community-edited + reviewed by Mozilla maintainers; cross-checked against W3C/WHATWG standards.

About this sub-score →
Modern Reference
A+·95

Open-source content (CC-BY-SA + MIT for examples); GitHub-tracked; full structured data.

About this sub-score →
Citation Velocity
A·92

Default web-platform citation in dev press + AI-engine retrieval for web-tech queries.

About this sub-score →

Signals behind these scores

Citation Discipline

A·92
  • Standards alignment
    Per-API content cross-referenced against W3C/WHATWG specifications.

Modern Reference

A+·95
  • Open-source docs
    github.com/mdn/content tracks every page; CC-BY-SA license.

Citation Velocity

A·92
  • Web-tech default
    Primary citation surfaced by ChatGPT/Claude/Perplexity for HTML/CSS/JS questions.

Cite this score

Copy a citation snippet for an article, post, or research note.

Markdown
[MDN Web Docs — SourceScore Index 93 (A)](https://sourcescore.org/source/mdn-web-docs/)
HTML
<a href="https://sourcescore.org/source/mdn-web-docs/">MDN Web Docs — SourceScore Index 93 (A)</a>
APA
SourceScore (v0.1). (2026). MDN Web Docs: SourceScore Index 93 (A). Retrieved from https://sourcescore.org/source/mdn-web-docs/

2 head-to-head comparisons

See all MDN Web Docs comparisons →

MDN Web Docs appears in 2 canonical SourceScore comparisons — each scored on Discipline, Modern Reference, and Velocity with a quote-ready verdict and JSON twin.

5 sources at MDN Web Docs's tier

See peer group →

Auto-computed nearest-neighbor sources by composite SourceScore distance — discover at-tier peers across all categories, with inline dim deltas surfacing who beats MDN Web Docs on Discipline, Modern Reference, and Velocity.

Embed this score

All embed options →

Drop on your blog or dashboard. Free, no signup.

<iframe src="https://sourcescore.org/embed/mdn-web-docs/" width="100%" height="380" loading="lazy" style="border:0;max-width:480px;" title="SourceScore: MDN Web Docs"></iframe>