Accessibility Is Good SEO: The Overlap You're Ignoring

The mechanism is simple. Google's crawler doesn't have eyes. It parses the same DOM, headings, and text alternatives that a screen reader like VoiceOver or NVDA reads aloud. An image with no alt attribute is invisible to both. A button that's actually a styled div with no label is a dead end for both. Accessible markup is machine-readable markup.

Start with alt text, because it's the clearest double win. A blank alt on a product photo means a blind shopper hears nothing and Google Images indexes nothing. Write what the image shows in plain language, keep it under about 125 characters, and skip 'image of.' On a Shopify store, that's the same field that feeds your image SEO.

Headings are the second overlap. Screen reader users navigate by heading, jumping H2 to H2 to scan a page. Search engines use that same hierarchy to understand topic structure. One H1 per page, then H2s and H3s in logical order, no skipping from H2 to H4 for visual size. Use CSS for size; use heading levels for meaning.

Semantic landmarks matter more than most founders think. Real <nav>, <main>, <button>, and <a> elements tell assistive tech and crawlers what each region does. A <div onclick> looks like a button but announces as nothing and often isn't crawlable as a link. Native elements come with keyboard support and machine meaning for free, so you write less code and rank cleaner.

Then there's speed and stability, which now sit inside Core Web Vitals. Layout shift (CLS) that makes a sighted user misclick also breaks keyboard focus order. Slow load (LCP) hurts users on screen readers and low-end phones the same way it hurts your rankings. Fixing these serves both accessibility and your Google performance score at once.

Audit with free tools before you hire anyone. Run Lighthouse in Chrome for a combined accessibility and SEO score, add the axe DevTools or WAVE extension to catch contrast and label issues, and use Screaming Frog to find missing alt text and broken heading structure across the whole site. Most small sites clear 80% of issues in an afternoon.

The honest caveat: accessibility is not a ranking hack, and Google has never confirmed WCAG compliance as a direct ranking factor. The overlap is indirect but real. You're removing friction for humans and machines at the same time, and in many regions (ADA, EU Accessibility Act) it's also a legal requirement. Treat it as baseline craft, not a bolt-on.