a11y

分类: 测试与安全 | 上传者: LDGUEST | 下载: 0 | 版本: v1.0（最新）
Runs a WCAG 2.1 AA accessibility audit on UI components — checks ARIA, keyboard nav, color contrast, focus management, and semantic HTML. Use when shipping user-facing features or auditing for compliance.
更新日志: Source: GitHub https://github.com/LDGUEST/NOX-CLI-ADD-ONS
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SKILL.md

---
name: a11y
description: Runs a WCAG 2.1 AA accessibility audit on UI components — checks ARIA, keyboard nav, color contrast, focus management, and semantic HTML. Use when shipping user-facing features or auditing for compliance.
---

Perform a WCAG 2.1 AA accessibility audit on the specified scope (component, page, directory, or full project). Scan source code for accessibility violations and produce a structured report with severity ratings and fix suggestions.

## Process

1. **Determine scope** — If given a specific component or directory, focus there. Otherwise, scan all UI components.
2. **Detect UI framework** — React, Vue, Svelte, Angular, plain HTML — adjust checks accordingly.
3. **Run all audit categories** below against the source code.
4. **Generate the report** with findings grouped by severity.

## Audit Categories

### 1. Semantic HTML

- **Heading hierarchy** — `h1` through `h6` used in order, no skipped levels
- **Landmark regions** — `<main>`, `<nav>`, `<header>`, `<footer>`, `<aside>` used appropriately
- **Lists** — Related items use `<ul>`/`<ol>`/`<li>`, not `<div>` chains
- **Buttons vs links** — `<button>` for actions, `<a>` for navigation. No `<div onClick>` without a role.
- **Tables** — Data tables use `<th>`, `scope`, and `<caption>`. Layout tables flagged as violations.

### 2. ARIA

- **Missing roles** — Interactive custom elements without `role` attribute
- **Missing labels** — `aria-label` or `aria-labelledby` absent on icon buttons, inputs, regions
- **Invalid ARIA** — `aria-*` attributes that don't match the element's role
- **Redundant ARIA** — `role="button"` on a `<button>`, `role="link"` on an `<a>` (unnecessary)
- **Live regions** — Dynamic content updates without `aria-live` announcement
- **Dialog/modal** — Missing `aria-modal`, `role="dialog"`, or focus trap

### 3. Keyboard Navigation

- **Tab order** — Interactive elements reachable via Tab in logical order
- **Focus indicators** — `:focus-visible` styles present, not removed with `outline: none` without replacement
- **Keyboard handlers** — `onClick` without corresponding `onKeyDown`/`onKeyUp` for custom interactive elements
- **Skip links** — "Skip to main content" link present on pages with navigation
- **Escape to close** — Modals, dropdowns, and popovers close on `Escape` key
- **Focus trapping** — Modals trap focus within the dialog while open
- **Focus restoration** — Focus returns to trigger element when modal/popover closes

### 4. Images & Media

- **Alt text** — All `<img>` elements have `alt` attribute. Decorative images use `alt=""`
- **Meaningful alt text** — Alt text describes the image content, not "image" or the filename
- **SVG accessibility** — SVGs have `role="img"` and `aria-label`, or `aria-hidden="true"` if decorative
- **Video/audio** — Captions or transcript available (flag if media exists without accessibility markup)

### 5. Forms

- **Labels** — Every input has an associated `<label>` (via `htmlFor`/`for` or wrapping)
- **Error messages** — Validation errors linked to inputs via `aria-describedby`
- **Required fields** — Marked with `aria-required="true"` or `required` attribute
- **Fieldsets** — Related inputs (radio groups, checkbox groups) wrapped in `<fieldset>` with `<legend>`
- **Autocomplete** — Common fields (name, email, address) have appropriate `autoComplete` attribute

### 6. Color & Contrast

- **Text contrast** — Flag hardcoded color combinations that may fail WCAG AA (4.5:1 for normal text, 3:1 for large text)
- **Color-only indicators** — Information conveyed by color alone without text/icon alternative (error states, status indicators)
- **Focus visibility** — Focus indicators have sufficient contrast against the background

### 7. Motion & Animation

- **Reduced motion** — Animations respect `prefers-reduced-motion` media query
- **Auto-playing content** — No auto-playing video/audio without user control
- **Flashing content** — No content that flashes more than 3 times per second

## Severity Levels

| Level | Definition | Examples |
|-------|-----------|----------|
| **Critical** | Blocks access for users with disabilities | Missing form labels, no keyboard access, images without alt text |
| **Major** | Significant barrier, workaround may exist | Broken tab order, missing focus indicators, no skip link |
| **Minor** | Inconvenience, doesn't block access | Redundant ARIA, suboptimal heading hierarchy, missing autocomplete |
| **Enhancement** | Best practice, beyond AA requirements | Missing `prefers-reduced-motion`, no live region for toast notifications |

## Output Format

```
ACCESSIBILITY AUDIT REPORT
===========================
Scope:     src/components/
Framework: React + Tailwind
Standard:  WCAG 2.1 AA

SUMMARY
-------
Critical:     X findings
Major:        X findings
Minor:        X findings
Enhancements: X suggestions

CRITICAL FINDINGS
-----------------
[C1] Missing form label
     File: src/components/SearchBar.tsx:14
     Issue: <input> has no associated <label> or aria-label
     Fix: Add aria-label="Search" to the input element

[C2] Image without alt text
     File: src/components/UserAvatar.tsx:8
     Issue: <img> missing alt attribute
     Fix: Add alt={`${user.name}'s avatar`} or alt="" if decorative

MAJOR FINDINGS
--------------
[M1] Focus indicator removed
     File: src/styles/globals.css:12
     Issue: `outline: none` applied globally without replacement
     Fix: Replace with :focus-visible styles that provide visible indication

...
```

## Rules

- **Source code analysis only** — This skill reads source files. It does not run a browser or execute JavaScript. Flag issues it can detect statically.
- **No false positives** — Only flag issues you can confirm from the code. If a component might receive an `aria-label` via props, note it as "verify" rather than "missing."
- **Respect component libraries** — If using Radix, Headless UI, or similar accessible primitives, check that they're configured correctly rather than flagging their internal patterns.
- **Prioritize impact** — Order findings by how many users are affected and how severely.

---
Nox
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