Accessibility and SEO.
Learn what Accessibility and SEO means in modern search and SEO.
The overlap between web accessibility standards (WCAG) and SEO best practices, where accessible sites are better understood by search engines.
Web accessibility (making sites usable by people with disabilities) and SEO share significant common ground. Many accessibility requirements—descriptive alt text, semantic HTML headings, keyboard navigation, clear link text, captions for video—also improve how search engines understand and index page content.
Shared Best Practices
Alt text describes images to screen reader users and to Googlebot simultaneously. Semantic HTML (using `<h1>`–`<h6>` for headings, `<nav>` for navigation, `<main>` for primary content) helps both assistive technologies and crawlers understand page structure. Transcripts for audio and video serve both deaf users and search indexing. Colour contrast and font size requirements, while primarily accessibility standards, correlate with lower bounce rates.
Accessibility as an Indirect Ranking Factor
Google does not directly rank on WCAG compliance, but the outcomes of accessible design—lower bounce rate, higher engagement, better Core Web Vitals, more indexable content—are measurable ranking signals. Brands serving regulated industries (government, healthcare, finance) face legal accessibility requirements under ADA, EN 301 549, and similar standards that create both legal and SEO incentives.
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