What is Web Accessibility (a11y)?
Turkish: Web Erişilebilirliği
Web accessibility ensures that users with disabilities can use content, forms, and workflows with assistive technologies.
What is Web Accessibility?
Web accessibility aims to make websites and applications usable for people with visual, auditory, motor, cognitive, or temporary limitations. The same work also improves reliability for users on low bandwidth, small screens, zoomed layouts, or keyboard-only navigation.
Core Principles
WCAG frames accessibility around four principles: perceivable, operable, understandable, and robust. In practice, that means semantic HTML, clear heading hierarchy, sufficient contrast, keyboard navigation, labeled form fields, visible focus states, alternative text, and understandable error messages.
ARIA can fill semantic gaps, but incorrect ARIA can make screen reader output worse. Responsive design is closely related because zoom, small screens, and different input methods often reveal accessibility problems.
Business Use
Accessibility matters for public-sector sites, banking, e-commerce, education platforms, and internal portals because it affects inclusion and legal risk. A purchase form that only works with a mouse excludes customers who rely on a keyboard or screen reader.
The best results come when design, development, and content teams work from the same standard. Automated tools are useful, but they do not replace real keyboard testing and screen reader checks.
Related Terms
ARIA adds roles, states, and properties to HTML so assistive technologies can understand custom interface components.
HTML (HyperText Markup Language)HTML is the markup language that defines the structure of headings, paragraphs, links, forms, media, and other web content.
Responsive DesignResponsive design adapts one web interface to different screen widths, input methods, and device capabilities without separate mobile pages.