Web accessibility (a11y) is often treated as a compliance checklist applied right before launch, but this approach inevitably leads to poor user experiences. True accessibility requires inclusive design from the very beginning. This means considering color contrast, keyboard navigation, and screen reader compatibility during the wireframing phase, not just in QA.
Semantic HTML is your strongest ally. Buttons should be buttons, not divs with click handlers. Forms require proper labels, and dynamic content changes need ARIA live regions to notify assistive technologies. When you build custom UI components like modals or comboboxes, managing focus states properly is critical to ensure keyboard users aren't trapped in your interface.
Investing in accessibility not only opens your application to millions of users with disabilities, but it also improves the experience for everyone. Captions help users in noisy environments, high contrast helps users in bright sunlight, and proper semantic structure significantly boosts your SEO. Building accessible software is a hallmark of engineering maturity.