Web Accessibility for UI Components: The Complete 2026 Checklist
The essential accessibility (a11y) checklist for UI components. Covers WCAG 2.1 compliance for buttons, forms, modals, cards, and navigation components.
Lead Developer, UIsen
Why Accessibility Matters for UI Components
Web accessibility (a11y) ensures that people with disabilities can perceive, navigate, and interact with your interface. It's not just ethical — it's legal in many jurisdictions (ADA, EAA) and improves UX for everyone.
Key statistic: Over 1 billion people worldwide live with some form of disability. That's approximately 15% of the global population. If your UI components aren't accessible, you're excluding a significant audience.
The Essential Checklist
Check these items for every UI component you build or use:
- 1Use semantic HTML elements (
- 2Ensure all interactive elements are keyboard-accessible (Tab, Enter, Space, Escape)
- 3Add visible :focus-visible styles that meet WCAG 2.1 contrast requirements
- 4Maintain 4.5:1 color contrast ratio for normal text (3:1 for large text)
- 5Include alt text for informative images and empty alt for decorative ones
- 6Use ARIA attributes only when semantic HTML is insufficient
- 7Support prefers-reduced-motion for animations
- 8Ensure form inputs have associated
- 9Test with screen readers (NVDA, VoiceOver, JAWS)
- 10Validate with automated tools (axe, Lighthouse, WAVE)
UIsen and Accessibility
UIsen components use semantic HTML by default. Buttons use , inputs use with proper labels, and interactive elements support keyboard navigation. When browsing UIsen, look for components that include focus states and ARIA attributes in their code.
Explore the full component library at uisen.io/elements.
Frequently Asked Questions
What is WCAG 2.1 AA compliance?
WCAG 2.1 AA is the internationally recognized standard for web accessibility. It requires, among other things: 4.5:1 color contrast for text, keyboard navigability, visible focus indicators, text alternatives for images, and error identification in forms. It's the most commonly required level for legal compliance.
How do I make a CSS button accessible?
Use a semantic <button> element (not a div or span). Ensure it has visible :focus-visible styles, sufficient color contrast, descriptive text content, and proper role/ARIA attributes if it has a non-obvious function. Test with keyboard-only navigation.
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