Accessibility Is SEO: The Overlap You Cannot Ignore
Accessibility and SEO overlap heavily: semantic HTML, descriptive alt text, a logical heading order, and keyboard navigation make a page easier for assistive technology and search crawlers to understand, improving both usability and rankings.
Accessibility and SEO are often treated as separate checklists. In practice they optimize for the same thing: a page a machine can understand and any human can use.
Semantic landmarks
Elements like nav, main, article, and header give screen readers and crawlers a structural map of the page for free. Divs with class names give them nothing.
Alt text does double duty
Descriptive alt text lets a screen-reader user understand an image and gives search engines text to index. Decorative images should have an explicit empty alt so they are skipped cleanly.
Heading order is a contract
A single H1 followed by a logical, non-skipping heading tree is both an accessibility requirement and a strong content-structure signal.
Contrast and keyboard access
Sufficient color contrast and full keyboard navigation are accessibility essentials — and they are exactly the kind of quality signals that correlate with the experiences search engines reward.