Indexation8 min
Complete Guide to Configuring robots.txt for Search Engines
Deep dive into User-agent, Disallow, Allow, Sitemap, and Crawl-delay directives. Common traps where websites inadvertently block CSS and JS assets.
WebDiag Knowledge Base
Technical SEO Guides, Web Standards, and Remediation Walkthroughs
Actionable articles, diagnostic walkthroughs, and technical documentation on site performance, security headers, structured data, and search engine crawlability.
Performance11 min
Core Web Vitals Optimization in 2026: Green LCP, INP, and CLS
Actionable techniques to minimize main-thread execution, slash Largest Contentful Paint delays, improve Interaction to Next Paint, and eliminate layout shifts.
Indexation7 min
Canonical URLs (rel=canonical): Solving Duplicate Content at Scale
Best practices for self-referential and cross-domain canonicals, URL parameters, facet navigation, pagination, and mobile redirects.
Indexation6 min
Redirect Architecture: Comparing 301, 302, 307, and 308 Responses
How to preserve link equity, prevent infinite redirect loops, and dismantle legacy redirect chains that waste Googlebot crawl budget.
Security9 min
SSL/TLS & HTTP Security Headers: HSTS, CSP, and Protocol Hardening
Hardening server responses against Clickjacking and XSS, eliminating mixed content warnings, and maintaining valid certificate chains.
Structured Data10 min
Schema.org JSON-LD Structured Data for Search Snippet Rich Results
Step-by-step implementation of Organization, Product, Article, FAQPage, and BreadcrumbList schemas. Syntax validation without errors.
Terminology
Technical Glossary
Crisp, authoritative definitions of foundational technical SEO and diagnostic concepts.
LCP (Largest Contentful Paint)
A Core Web Vitals metric reporting the render time of the largest visible image or text block within the viewport. Recommended threshold is under 2.5 seconds.
INP (Interaction to Next Paint)
A responsiveness metric observing all user interactions (clicks, taps, keypresses) on a page and logging the worst-case interaction latency. Ideal is under 200ms.
CLS (Cumulative Layout Shift)
Measures visual layout stability by quantifying unexpected element shifts during rendering. Target threshold is below 0.1.
Crawl Budget
The number of pages search engine crawlers can and want to inspect on your website within a specific time window, governed by server response speed and site authority.
Canonical URL
An HTML tag <link rel='canonical' href='...'> signaling the master copy of a page to search engines, preventing duplicate content dilution.
HSTS (Strict-Transport-Security)
An HTTP response header informing browsers to interact with the host solely over encrypted HTTPS connections.
Checklist
Pre-Launch SEO Checklist
Verify essential technical signals before pushing website updates to production.
- robots.txt permits crawling of key routes and static assets (CSS, JS, WebP)
- All live URLs return clean 200 OK statuses without multi-hop redirect chains
- Title and meta description tags are unique, relevant, and within length limits
- SSL certificate is active, HTTP permanently redirects to HTTPS, and HSTS is set
- All images specify explicit width/height dimensions and descriptive alt attributes
- Core Web Vitals scores pass on real mobile browser devices
Put These Principles into Practice
Run a comprehensive technical SEO inspection of your website in just a few seconds.