dragoon0x CANON · SEO
Technical SEO is about making content findable and understandable by search engines. Not tricks — structure.
Semantic HTML is SEO
Search engines understand semantic HTML natively. Every rule in canon-accessibility that improves screen reader experience also improves SEO.
<h1>once per page, matching the page topic.- Heading hierarchy (h1 → h2 → h3) reflects content structure.
<nav>,<main>,<article>,<aside>help crawlers understand page layout.<a href>for links (not<div onClick>).<img alt>describes the image for image search.
Essential meta tags
<head>
<title>Page Title — Site Name</title>
<meta name="description" content="Concise summary under 155 characters.">
<link rel="canonical" href="https://example.com/page">
<meta name="robots" content="index, follow">
</head>
<title>: 50–60 characters. Unique per page. Primary keyword near the front.<meta description>: 120–155 characters. Compelling summary. Unique per page.<link rel="canonical">: prevents duplicate content penalties.<meta robots>:index, followis default.noindexfor admin pages.
Structured data (JSON-LD)
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@type": "Article",
"headline": "Page Title",
"author": { "@type": "Person", "name": "Author" },
"datePublished": "2026-04-18"
}
</script>
Use for: articles, products, FAQs, breadcrumbs, organizations, events. Google uses structured data for rich results (stars, prices, FAQ dropdowns).
Page speed = ranking factor
Core Web Vitals are a Google ranking signal. See canon-performance for targets:
- LCP ≤ 2.5s
- INP ≤ 200ms
- CLS ≤ 0.1
Crawlability
robots.txt: allow crawlers access to important pages, block admin/API routes.sitemap.xml: list all public pages with<lastmod>dates.- Internal linking: every important page reachable within 3 clicks from the homepage.
- No orphan pages (pages with no internal links pointing to them).
Anti-patterns
| Anti-pattern | Why it fails |
|---|---|
Same <title> on every page |
Search engines can't distinguish pages |
No <meta description> |
Search engine generates one (often badly) |
| Keyword stuffing | Penalized by modern search engines |
| Client-rendered content without SSR/SSG | Crawlers may not execute JS |
| No canonical URL | Duplicate content across www/non-www, http/https |
| Blocking CSS/JS in robots.txt | Crawlers can't render the page |
Audit checklist
- Unique
<title>per page, 50–60 characters - Unique
<meta description>per page, 120–155 characters -
<link rel="canonical">on every page - One
<h1>per page matching the topic - Heading hierarchy is correct
- Images have descriptive
alttext - Structured data (JSON-LD) for content types
-
sitemap.xmlsubmitted to search consoles -
robots.txtallows crawling of public pages - Core Web Vitals in "Good" range
Sources
- Google Search Central · SEO starter guide
- Schema.org · structured data types
canon-performancefor Core Web Vitalscanon-accessibilityfor semantic HTML