Why it matters
Around one in five people has a disability affecting how they use the web: that's customers, not edge cases. Accessibility failures also carry legal risk in many markets, and the fixes (structure, contrast, clear labels) improve usability and SEO for everyone.
How it works
Accessible sites use real headings and landmarks, sufficient colour contrast, text alternatives for images, visible focus states, and forms with proper labels. Screen readers and keyboards then have the same map of the page that sighted mouse-users get visually.
What to do about it
Run a free automated check (Lighthouse includes one) on your top pages, fix the flagged basics, then do the two-minute human test: navigate your own site using only the Tab key.
