Accessibilité Web - WCAG 2.2 AA

name: intopia-web-accessibility description: Build accessible web user interfaces that meet WCAG 2.2 Level AA. Use whenever generating HTML, CSS, JSX, TSX, React, Vue, or Svelte components, pages, forms, modals, or email templates - including small snippets. user-invocable: true metadata: author: Intopia version: "2.1"

Overview

Apply these accessibility principles whenever generating or modifying UI code. The goal is interfaces usable by people of all abilities, without workarounds.

Instructions

1. Identify each UI component and which cross-cutting topics the user's request touches (forms, keyboard/focus, images/charts, drag and drop, live regions, responsive layout, structure/semantics, colour).
2. Read INDEX.md. For every component identified, load the linked acceptance criteria file (and code example file, if one exists). For every applicable topic, load its file from references/topic/ via the Topic Index. These are authoritative - do not generate code without consulting them.
3. If colour values are involved, consult references/colour-contrast/Colour Contrast Reference.md.
4. Apply the Universal Rules below to fill any gaps not covered by the component or topic references.
5. Generate the code.
6. After presenting the code, list the specific accessibility decisions made, one line per component or pattern (e.g. "Modal: focus moves to heading on open, trapped while open, returns to trigger on close").

Universal Rules (always apply)

These rules apply to every generation regardless of which topics are loaded. Load the relevant topic file (see the Topic Index in INDEX.md) for the detail behind each.

• Use semantic HTML first; use elements for their intended purpose. See references/topic/Topic - Structure and Semantics.md.
• Use ARIA sparingly; never add a role a native element already has. See references/topic/Topic - Structure and Semantics.md.
• Every interactive element has an accessible name, correct role, and current state.
• Tab order follows visual reading order; never use tabindex greater than 0; focus is never lost or moved off-screen. See references/topic/Topic - Keyboard and Focus.md.
• All interactive elements have a visible focus indicator with at least 3:1 contrast.
• Manage focus for dynamic content (modals, menus, SPA navigation). See references/topic/Topic - Keyboard and Focus.md.
• Text and UI contrast meets 4.5:1 (normal text) or 3:1 (large text and UI components). See references/colour-contrast/Colour Contrast Reference.md.
• Never convey meaning by colour alone.