Education & Reference

HTML5ANDCSS3

Last updated 2026-09-11 · benchmark measured 2026-09-11 — deterministic & reproducible

HTML5ANDCSS3 offers tutorials, developer tools, and articles for web development.

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To cite this score: legit.show/s/html5andcss3-org/2026-09-11. That address never changes; this page moves with every re-measure.

Legit.Show scored HTML5ANDCSS3 95/100 on 2026-09-11, measured across 5 of 7 frames from its public surface. legit.show/s/html5andcss3-org/2026-09-11

Is HTML5ANDCSS3 production-ready?

Legit.Show scores HTML5ANDCSS3 95 out of 100 — the simple average of its 5 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on HTML5ANDCSS3 (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Security; its weakest is Privacy. 5 of the seven frames returned a score; Performance and Accessibility were not measurable on this service and are recorded as null — not as zero. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

• Performance — not measurable on this service (null — not scored as 0)
• Accessibility — not measurable on this service (null — not scored as 0)
• Security — 100/100
  How this compares across the catalogue: The Web Security Baseline
• Privacy — 75/100
  How this compares across the catalogue: The Privacy Gap
• Reliability — 100/100
• Standards — 100/100
• Discoverability — 100/100

What we measured

• Security headers present: CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy.
• Served over HTTPS with a valid certificate.
• Real Lighthouse performance run — 177 ms to first byte.
• Returns a proper 404 for unknown routes.
• 3 of 3 sampled routes reachable.
• Has a reachable privacy policy.
• Sets cookies / loads scripts with no consent prompt.
• Discoverable: structured data, sitemap, OpenGraph image, canonical URL.

Who built it

product account @Html5andCss31

Who it's for

Beginner developers · Web developers · Students · Frontend learners

Sources and updates

Description

Taken from html5andcss3.org's own website on 2026-09-11.

Operator

html5andcss3.org, as named in html5andcss3.org's terms, privacy page or footer.

Benchmark

Measured by Legit.Show from the live site, the way any visitor sees it — with no access to its code or accounts. Same method for every product, and no AI decides the score. Last checked 2026-09-11.

Put together from public information, without HTML5ANDCSS3's involvement. If anything here is wrong, tell us and a person will check it.

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