Technical SEO Standards Reference
19 standards that govern crawl architecture at scale. Each standard includes the rule, rationale, implementation guide, common violations, and the fix.
| # | Standard | Category | Spec | Status | Last Updated |
|---|---|---|---|---|---|
| 01 | URL Format & Structure | Architecture | RFC 3986 (2005) | Stable | 2025-12-01 |
| 02 | Trailing Slash Consistency | Architecture | RFC 3986 Section 6.2.3 | Stable | 2025-12-01 |
| 03 | Canonical Tags | Duplicate Control | RFC 6596 (2012) | Stable | 2025-11-15 |
| 04 | HTTP Redirects | URL Management | RFC 9110 (2022) | Stable | 2025-11-15 |
| 05 | Robots.txt Protocol | Crawl Control | RFC 9309 (2022) | Stable | 2026-01-10 |
| 06 | Mobile-First Indexing | Crawling | Google (2018, completed 2024) | Stable | 2025-10-01 |
| 07 | Breadcrumb Navigation & Schema | Navigation | Schema.org BreadcrumbList | Stable | 2025-09-15 |
| 08 | Clean URL Architecture | Architecture | Best Practice (No RFC) | Stable | 2025-12-01 |
| 09 | XML Sitemaps | Discovery | Sitemaps.org Protocol (2008) | Stable | 2026-01-15 |
| 10 | IndexNow Protocol | Push Indexing | IndexNow.org (2021) | Stable | 2026-01-15 |
| 11 | Pagination Architecture | Content Structure | Google deprecated rel=prev/next (2019) | Stable | 2025-11-01 |
| 12 | 404 & 410 Error Handling | Crawl Signal | RFC 9110 (2022) | Stable | 2025-10-15 |
| 13 | JavaScript SEO & Rendering | Rendering | Google Rendering Service (GRS) | Stable | 2026-01-01 |
| 14 | Cloaking & Content Parity | Compliance | Google Webmaster Guidelines | Stable | 2025-09-01 |
| 15 | Subdomain vs. Subdirectory | Architecture | Best Practice (No RFC) | Stable | 2025-08-15 |
| 16 | Anchor Text & Internal Links | Link Equity | Best Practice (No RFC) | Stable | 2025-11-01 |
| 17 | Nofollow, Sponsored & UGC | Link Equity | Google (2005, updated 2019) | Stable | 2025-10-01 |
| 18 | Alpha-Trail Pattern | RIBA | BigDataSEO.com (2026) | Draft | 2026-03-01 |
| 19 | Redirect Chain Management | URL Management | RFC 9110 + Best Practice | Stable | 2025-12-01 |