AI Visibility Scorecard
The Book of CSS3
bookofcss3.com · Technology
At 3/10, The Book of CSS3 is close to invisible in AI search today. Most assistants will not cite it when asked about your category - fixable, and the signals below show exactly where to start.
Monitoring for AI engine activity
In the Engagemii AEO index
#2,283,648 of 2,707,166 in Technology for AI visibility
3
AEO Visibility
iNear-invisible · 3/10
0
Muse Index Score
iAI agent readiness
Not agent-ready · 0/100
0
AI Adoption
iNone detected · 0/100
About The Book of CSS3
from our crawl and measurement
"Companion site for The Book of CSS3 by Peter Gasston for No Starch Press. Example files, updates, and errata." That is how The Book of CSS3 introduces itself. To AI engines like ChatGPT and Perplexity, though, it is barely visible: it scores 3.0 out of 10.
The site is missing structured data describing the business, an llms.txt file and a sitemap.
The 6 signals AI reads
Strong · Good · Fair · Weak
Structured Data
Weak
Organization / LocalBusiness JSON-LD that AI can read.
Content Structure
Good
Clear headings and answer-style content.
Entity Clarity
Fair
How clearly your brand identity reads to AI.
E-E-A-T Signals
Experience, Expertise, Authority, Trust
Weak
Experience, Expertise, Authority, Trust markers.
Technical AEO
Fair
robots.txt, llms.txt, and AI-bot crawl access.
AI Discoverability
Fair
Sitemaps and entity links AI can follow.
Off-page authority
How the web signals your brand to AI
Backlinks
Weak
No inbound links found yet.
Domain Authority
Weak
Little domain authority yet.
Reference Presence
Weak
Not in AI knowledge graphs yet.
News & Press
Weak
No press coverage found yet.
Community
Weak
No community discussion yet.
Social Mentions
Weak
No social discussion found yet.
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. Roughly two-thirds of sites are invisible to them. At 3/10, The Book of CSS3 is crawlable but under-signaled - fixable, and the signals above are where to start.
Frequently Asked Questions
What is CSS3?
CSS3 is the latest revision of cascading style sheets, the language used to define the appearance and layout of web documents. A still-evolving standard, CSS3 presents a moving target for developers who need to stay abreast of which features are supported by particular web browsers.
Is this your brand?
The exact fixes for The Book of CSS3
Which AI engines already crawl you
Free AI bot monitoring: see every AI crawler that visits you
Why your brand doesn't show up in ChatGPT answers (and how to fix it)
ChatGPT doesn't crawl the web like Google does. When someone asks Claude about the best project management tools, the model isn't searching your website in real-time. It's pulling from training data that stopped months or years ago.
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Source & Attribution
Scored by Engagemii on October 3, 2026. Methodology: engagemii.com/aeo/methodology
Source URL: https://engagemii.com/aeo/brands/bookofcss3
Cite this score: Engagemii (2026). "AEO Score for The Book of CSS3." Retrieved from https://engagemii.com/aeo/brands/bookofcss3
Licensed under CC BY 4.0. You may reuse this data with attribution: a visible link to engagemii.com.
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