tailwindcss.com
B (74/100) Open to Search & TrainingTailwind CSS - Rapidly build modern websites without ever leaving your HTML.
| AI & /llms.txt Readiness | Signal-to-Noise Ratio | Token Savings via /llms.txt | Network TTFB | TLS & HTTP Security | DNS & Edge Stack |
|---|---|---|---|---|---|
| 43/100 | 0.8% (1,678 / 219,494 tok) | 0% (No /llms.txt) | 51 ms (98/100) | 63/100 | Cloudflare (Next.js) |
Web-to-Token Efficiency & Agent Ingestion Cost
~4 bytes/token UTF-8 heuristic| Ingestion Source | Payload | Est. Tokens | Cost / 1k Reads (Flash $0.35) | Cost / 1k Reads (Pro $1.25) |
|---|---|---|---|---|
Raw HTML DOM (GET /) |
857.4 KB | 219,494 | $76.8229 | $274.3675 |
| Stripped Readable Text | 6.6 KB | 1,678 | $0.5873 | $2.0975 |
/llms.txt Manifest |
Not deployed — agents must parse 219,494 raw HTML tokens | |||
/llms.txt Spec Linter & Agent Endpoint Probe
Status: Not Deployed
| GET /llms.txt | Missing — Generate spec-compliant /llms.txt for tailwindcss.com → |
| GET /llms-full.txt | Not deployed |
| GET /.well-known/mcp.json | Not advertised |
| JSON-LD Schema Entities | None detected in initial HTML |
AI Crawler /robots.txt Access Matrix
Open to Search & Training
| User-Agent Token | Purpose / Operator | Effective Directive |
|---|---|---|
| OAI-SearchBot | ChatGPT Search Citations | Allow: / |
| PerplexityBot | Perplexity Answer Citations | Allow: / |
| ChatGPT-User | Live User Agent Browsing | Allow: / |
| Claude-SearchBot | Anthropic Search Grounding | Allow: / |
| GPTBot | Foundation Model Training | Allow: / |
| ClaudeBot | Foundation Model Training | Allow: / |
| Google-Extended | Gemini Training Control | Allow: / |
| Applebot-Extended | Apple Intelligence Training | Allow: / |
| Meta-ExternalAgent | Llama Training & Indexing | Allow: / |
| CCBot | Open Dataset Training Corpus | Allow: / |
HTTP Response & Handshake Timing
GET https://tailwindcss.com/| DNS Lookup | 6 ms | HTML Document | 857.4 KB |
| TCP Connect | 13 ms | Script Tags | 15 |
| TLS Handshake | 0 ms | Stylesheets | 2 |
| Time to First Byte (TTFB) | 51 ms | Images (with alt) | 15 / 40 |
| Total Transfer | 57 ms | HTTP/3 (Alt-Svc) | Not advertised |
Edge Network & Application Stack
Header & DOM Signatures| Edge / Reverse Proxy | Cloudflare |
| Application Framework | Next.js |
| Server Header | cloudflare |
| Mail Provider (MX) | Custom MX |
| Telemetry Signatures | GA4 / GTM, PostHog |
| TXT Verifications | None published on apex TXT |
TLS Certificate & HTTP Security Policy
Port 443 X.509| Certificate Issuer | Google Trust Services (89 days remaining) |
| Strict-Transport-Security | Present |
| Content-Security-Policy | Not set |
| X-Content-Type-Options | Not set |
| X-Frame-Options | Not set |
| Referrer-Policy | Not set |
| Permissions-Policy | Not set |
| SPF / DMARC Policy | SPF: Yes · DMARC: Yes |
Authoritative DNS & Document Head
A / AAAA / NS / Canonical| A (IPv4) | 104.26.3.143, 104.26.2.143, 172.67.68.11 |
| AAAA (IPv6) | 2606:4700:20::681a:28f, 2606:4700:20::681a:38f, 2606:4700:20::ac43:440b |
| NS (Nameservers) | anuj.ns.cloudflare.com, roxy.ns.cloudflare.com |
| HTML Title (76c) | Tailwind CSS - Rapidly build modern websites without ever leaving your HTML. |
| /sitemap.xml | Not found |
Hosted /llms.txt Mirror & Status Badge
Platform Setup Guide →
<head> Tag (for Shopify, Webflow, Framer, Wix, Squarespace & WordPress):
Technical Synthesis & Agentic Ingestion Analysis: tailwindcss.com
Automated Engineering Assessment1. HTML-to-Token Efficiency & LLM Context Window Cost
An unauthenticated HTTPS GET request to https://tailwindcss.com/ returns an initial HTML payload of 857.4 KB, corresponding to approximately 219,494 UTF-8 tokens when ingested raw by an AI coding agent, retrieval pipeline, or headless browser. After stripping inline <script>, <style>, <svg>, and DOM markup tags, the human-readable text footprint measures 1,678 tokens (6.6 KB)—yielding an HTML Signal-to-Noise Ratio of 0.8%.
Because tailwindcss.com does not currently serve a machine-readable /llms.txt manifest at its root path, autonomous agents must either parse the full 219,494-token HTML payload ($274.3675 per 1,000 frontier reads) or run a DOM-stripping pass before grounding.
2. AI Crawler Governance & /robots.txt Posture
Based on live inspection of https://tailwindcss.com/robots.txt, tailwindcss.com maintains a Open to Search & Training posture. Specifically, AI search citation crawlers (OAI-SearchBot: Allowed, PerplexityBot: Allowed) and foundation model training crawlers (GPTBot: Allowed, ClaudeBot: Allowed, CCBot: Allowed) are governed explicitly by the host’s root robots policy.
3. Edge Delivery, TLS Handshake & Security Header Assessment
Traffic for tailwindcss.com resolves to 104.26.3.143 via Cloudflare running Next.js, achieving a measured Time to First Byte (TTFB) of 51 ms (DNS lookup: 6 ms, TCP connect: 13 ms, TLS handshake: 0 ms). The port 443 TLS certificate is issued by Google Trust Services with 89 days remaining before expiration (valid through 2027-02-11). Outbound email authentication via SPF is present and DMARC (_dmarc.tailwindcss.com) is enforced.
Comparable Hosts in Web-to-Token & /llms.txt Registry
Full Index (26 hosts) →| Host | Rating | /llms.txt | HTML Tokens | Text Tokens | Signal % | Crawler Posture | TTFB |
|---|---|---|---|---|---|---|---|
| sitecube.com | A+ 98 | 1,600 tok | 11,832 | 1,132 | 9.6% | Open to Search & Training | 99 ms |
| cloudflare.com | A+ 96 | 4,294 tok | 333,631 | 471 | 0.1% | Open to Search & Training | 291 ms |
| trendyflash.com | A+ 95 | 2,987 tok | 12,123 | 1,660 | 13.7% | Open to Search & Training | 112 ms |
| multifactor.com | A+ 94 | 656 tok | 98,275 | 673 | 0.7% | Open to Search & Training | 97 ms |
| github.com | A+ 92 | 7,165 tok | 131,504 | 1,159 | 0.9% | Open to Search & Training | 35 ms |
| vercel.com | A+ 92 | 1,385 tok | 149,859 | 889 | 0.6% | Open to Search & Training | 53 ms |
| aiimpacted.org | A+ 92 | 971 tok | 17,598 | 3,568 | 20.3% | Open to Search & Training | 55 ms |
| tierones.io | A+ 92 | 481 tok | 3,744 | 693 | 18.5% | Open to Search & Training | 95 ms |
| cloq.com | A 91 | 1,169 tok | 2,109 | 690 | 32.7% | Open to Search & Training | 51 ms |
| supabase.com | A 89 | 879 tok | 337,513 | 1,905 | 0.6% | Open to Search & Training | 48 ms |
| dosefacts.org | A 89 | 10,936 tok | 29,008 | 7,291 | 25.1% | Open to Search & Training | 335 ms |
| postman.com | A 89 | 5,375 tok | 118,892 | 11,040 | 9.3% | Open to Search & Training | 947 ms |