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HTML Conformance Checkers — WHATWG
What this score means
Your AEO score measures whether AI search engines (ChatGPT, Claude, Perplexity, Gemini) can actually read your site and cite it in answers. Two-thirds of websites are invisible to them. HTML Conformance Checkers — WHATWG just got measured.
4/10 means HTML Conformance Checkers — WHATWG is borderline visible. AI bots can crawl your site but your structured-data signals are thin. You are at risk of being skipped when buyers ask AI for a recommendation.
About HTML Conformance Checkers — WHATWG
WHATWG HTML Conformance Checkers Standards FAQ Policies Participate Here are the currently known online conformance checkers that track the HTML Standard: Nu Html Checker Address of page to check: Please let us know if you are working on a conformance checker.
Key Topics
Details
Category: Technology
validator.whatwg.orgAI Visibility Breakdown
1
Structured Data
6
Content Structure
4
Entity Clarity
3
E-E-A-T Signals
5
Technical AEO
2
AI Discoverability
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Your full 6-category score breakdown
Exact fixes: robots.txt, schema, llms.txt
AI bot crawls from ChatGPT, Claude, Perplexity, Gemini
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Source & Attribution
Scored by Engagemii on May 26, 2026. Methodology: engagemii.com/aeo/methodology
Source URL: https://engagemii.com/aeo/brands/validator-whatwg-org
Cite this score: Engagemii (2026). "AEO Score for HTML Conformance Checkers — WHATWG." Retrieved from https://engagemii.com/aeo/brands/validator-whatwg-org
Licensed under CC BY 4.0. You may reuse this data with attribution: a visible link to engagemii.com.
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