Core SEO

Detects mismatch between HTML canonical tag and Link header

Validates canonical URL presence and format

Checks for proper character encoding declaration

Checks for valid HTML5 doctype declaration

Checks for favicon presence

Validates H1 tag presence and uniqueness

Validates meta description presence and length

Validates page title presence and length

Detects pages preventing search engine snippets

Validates Open Graph meta tags for social sharing

Checks robots meta tag for indexing directives

Checks that page titles are unique across the site

Validates Twitter Card meta tags