Accessibility is not an afterthought. It is a fundamental part of good development. Building accessible React components means creating experiences that work for everyone, regardless of how they interact with the web.
Understanding WCAG 2.2 Principles
The Web Content Accessibility Guidelines (WCAG) 2.2 provides a framework for creating accessible web experiences built on four core principles: Perceivable, Operable, Understandable, and Robust (POUR). Every React component you build should satisfy these principles. Perceivable means users must be able to perceive the content through at least one of their senses. Operable means interactive elements must work across various input methods. Understandable means the interface must be predictable and clear. Robust means content must be interpretable by assistive technologies.
Semantic HTML First
Before reaching for ARIA attributes, use semantic HTML elements. A button should be a button, a navigation should be a nav, and a heading should be a heading. Semantic elements provide built-in accessibility features like keyboard interaction and screen reader announcements. React makes this easy with JSX - you can write nav, main, section, and article directly. This is the single most impactful thing you can do for accessibility.
Keyboard Navigation Patterns
Not all users can use a mouse. Ensure every interactive element is reachable and operable via keyboard. Use tabIndex carefully - only add positive tabIndex values when you need to change the natural tab order. Implement custom keyboard handlers for complex widgets like dropdowns, modals, and autocomplete fields. Common patterns include Enter or Space to activate, Escape to dismiss, and Arrow keys for navigation within groups.
Color Contrast and Visual Design
WCAG 2.2 requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. Use tools like the WebAIM contrast checker to verify your color combinations. Never rely solely on color to convey information. Pair color indicators with icons, text labels, or patterns. For users with low vision or color blindness, this distinction is critical for understanding interface states.
Testing with Assistive Technologies
Manual testing with screen readers like NVDA, VoiceOver, and JAWS reveals issues automated tools miss. Navigate your application using only the keyboard. Test with zoom at 200 percent. Verify that focus indicators are visible and logical. Automated tools like axe-core and Lighthouse catch roughly 30 percent of accessibility issues. The remaining 70 percent require human judgment and manual testing.