acessibilidade

WCAG 2.1 AA accessibility ensures HTML pages are usable by all users, including those relying on screen readers. Implement semantic HTML5 tags (nav, main, section, footer), add ARIA labels and roles to interactive components, maintain color contrast ratios, and enable keyboard navigation with visible focus indicators.

Semantic tags like nav, header, main, section, and footer create clear document structure that screen readers interpret correctly. Use nav for navigation, main for primary content, section for thematic groupings, and footer for footer content. This structure replaces generic div elements and signals page organization to assistive technologies.

Interactive components require ARIA attributes and keyboard support. Use aria-expanded to indicate state, aria-controls to link triggers to targets, and aria-modal for modals. Ensure Tab key navigation works, focus remains visible, and Escape or other keyboard shortcuts function as expected by users of assistive technology.

WCAG 2.1 AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold and above). Test foreground and background color pairs using contrast checking tools to verify compliance and ensure readability for users with low vision.

Add alt text to all informative images; decorative images use empty alt attributes (alt=""). Effective alt text describes the image's content and function concisely (under 125 characters), allowing screen reader users to understand its purpose without seeing it visually.

Yes, keyboard navigation testing is essential for WCAG 2.1 AA compliance. Tab through all interactive elements to verify logical focus order, ensure focus is always visible, and confirm all functions accessible by mouse are also reachable via keyboard without keyboard traps.