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What it checks: classic SEO (title, description, canonical, Open Graph, Twitter Cards, headings, alt text), JSON-LD structured data (required + recommended fields per type, ISO 8601 dates, absolute URLs), GEO/AEO signals (llms.txt, AI-crawler accessibility, Island Test for citation-worthy paragraphs), Core Web Vitals, accessibility, and security headers — across every public page of your site.

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content · content.images.missingAlt

Images missing alt text

Alt text is required for accessibility (WCAG) and image SEO. Use alt="" for purely decorative images.

Why it matters

Missing alt text breaks screen-reader navigation and removes images from Google Images SEO.

Authoritative reference

https://www.w3.org/WAI/tutorials/images/

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Related checks in content

· Page has no H1