Accessibility

Accessibility in web development means building websites and applications that people with disabilities can use without barriers. This covers visual impairments handled by screen readers, motor limitations that prevent mouse use, hearing loss relevant to video content, and cognitive differences that affect how people process information.

Practically, accessibility translates into concrete implementation decisions: semantic HTML so screen readers understand page structure, sufficient color contrast ratios, keyboard navigation for all interactive elements, alt text for images, captions for videos, and focus indicators that are visible and logical. These are not decorative details -- they determine whether a person can actually use your product.

Beyond ethics, accessibility has a direct business case. Roughly 15% of the global population has some form of disability. Legal frameworks like the Americans with Disabilities Act (ADA) and European Accessibility Act impose compliance requirements on many organizations. Inaccessible sites create legal exposure and exclude paying customers.

A common misconception is that accessibility conflicts with modern design. In practice, the constraints it imposes -- cleaner HTML, better keyboard handling, clearer visual hierarchy -- tend to improve usability for everyone. Accessible sites typically score better on SEO as well, since search engines rely on similar signals that assistive technologies use. The best time to address accessibility is during initial development, not as a retrofit after launch.