petrkindlmann
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accessibility-testing
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Source documentation, not instructions for this website. Review permissions before running any commands.
Check .agents/qa-project-context.md first — if it exists, use it as the foundation and skip
anything already answered.
Requirements and compliance (sets the target level and audit obligations)
Current state (tells you whether you're auditing or preventing regressions)
Testing infrastructure (determines what you can automate vs. must do by hand)
Automated testing catches 30-40% of issues — no more. axe-core finds missing alt text, low contrast, missing labels, and invalid ARIA. It cannot tell you whether alt text is meaningful, whether tab order is logical, or whether a custom widget is operable. Passing axe is necessary, not sufficient. Crucially, axe ships no automated rule for several WCAG 2.2 success criteria (2.4.11 focus-not-obscured, 2.5.7 dragging movements, and 2.5.8 target-size only partially) — a green axe run does not equal 2.2 AA conformance.
Semantic HTML first, ARIA as last resort. Native elements (<button>, <nav>,
<input>, <dialog>) carry built-in semantics, keyboard behavior, and screen reader
support. A <div role="button"> also needs tabindex, Enter/Space handlers, focus styles,
and ARIA state — all of which a <button> gives you free. Reach for ARIA only when no
native element fits.
Test in impact order: keyboard, screen reader, automated. Keyboard issues physically block users from features (highest impact). Screen reader issues confuse with wrong announcements. Automated checks catch the mechanical remainder. Start where the damage is worst, not where the tooling is easiest.
Accessibility is a quality attribute, not a feature. Test it continuously like performance or security — every new component, every PR. Retrofitting accessibility onto a finished product costs 10-100x more because inaccessible patterns get baked into the component library.
Test with real assistive technology. Browser DevTools and axe extensions are dev aids, not substitutes for VoiceOver (macOS/iOS), NVDA (Windows), and TalkBack (Android), which each behave differently. Reserve manual AT passes for complex custom widgets.
Install @axe-core/playwright (the 4.11.x line; it tracks axe-core's major.minor). Wrap it in
a reusable checkAccessibility(page, testInfo, options) helper that filters to the WCAG tags
['wcag2a', 'wcag2aa', 'wcag22aa'], attaches the full results JSON to the test for the audit
trail, and asserts violations.toHaveLength(0). Loop it over every key page and over
interactive states (modal open, menu expanded), not just the default load.
Suppress a rule only with a documented justification (a tracking issue or inline comment) and
exclude third-party widgets you don't own rather than disabling the rule globally.
See references/recipes.md for the install command, RGAA tag caveat, the full helper, the
page-loop and interactive-state specs, rule suppression, and CI integration.
Automated scanning is the floor. These checks need a human (or a keyboard-driven Playwright
spec — see references/recipes.md for the keyboard specs).
outline: none without a replacement.<main>.| Screen Reader | OS | Browser | Free? |
|---|---|---|---|
| VoiceOver | macOS/iOS | Safari | Yes (Cmd+F5) |
| NVDA | Windows | Firefox/Chrome | Yes |
| JAWS | Windows | Chrome/Edge | No |
| TalkBack | Android | Chrome | Yes |
alt="" for decorative).<label> tied via for/id (placeholder is not a label).required / aria-required).aria-describedby to link to the input and role="alert" to announce.<fieldset> and <legend>.| Criterion | What it means | Common failure |
|---|---|---|
| 1.1.1 Non-text Content | Images have alt text | <img> without alt |
| 1.3.1 Info and Relationships | Structure via HTML semantics | <div> styled as a heading |
| 2.1.1 Keyboard | All functionality via keyboard | Custom widget responds only to mouse |
| 2.4.1 Bypass Blocks | Skip navigation link | No skip link |
| 3.1.1 Language of Page | <html lang="en"> set | Missing lang |
| 3.3.1 Error Identification | Errors described in text | Error shown only by red border |
| 4.1.2 Name, Role, Value | Custom controls expose name/role | <div onclick> with no role |
| Criterion | What it means | Common failure |
|---|---|---|
| 1.4.3 Contrast (Minimum) | 4.5:1 normal, 3:1 large | Light gray on white |
| 1.4.4 Resize Text | Scales to 200% without loss | Fixed-height containers clip text |
| 1.4.11 Non-text Contrast | UI components 3:1 | Low-contrast input borders |
| 2.4.7 Focus Visible | Keyboard focus visible | outline: none with no replacement |
| 2.5.8 Target Size | Touch targets 24×24px min | Tiny icon buttons |
| 3.3.2 Labels or Instructions | Inputs have labels | Placeholder as the only label |
| 3.3.8 Accessible Auth | No cognitive function test | CAPTCHA with no alternative |
| Criterion | What it means |
|---|---|
| 1.4.6 Contrast (Enhanced) | 7:1 normal text, 4.5:1 large |
| 2.4.9 Link Purpose (Link Only) | Link text alone describes destination |
| 3.1.5 Reading Level | Lower-secondary education level |
Test on the accessible tree (roles, names, ARIA state), not on CSS. The patterns you need runnable tests for:
aria-describedby, aria-invalid='true', focus on first error.aria-modal='true', aria-labelledby, focus trapped, Escape returns focus.role="menu" or role="listbox", aria-expanded),
loading skeleton (aria-busy='true' during fetch), toast (aria-live='polite'). These carry
different ARIA per state, so click to trigger the state change and assert the open-state ARIA —
the default page snapshot never exercises them.columnheader roles, aria-sort reflects the active sort.main; banner, navigation, contentinfo present.See references/patterns.md for the full runnable tests for every pattern above.
Playwright's toMatchAriaSnapshot() captures the accessible tree as YAML and asserts against
it — the fastest way to catch a regression where a visual change silently breaks semantics (a
<div> restyled to look like a button, a heading demoted to plain text). It checks structure
and accessible names, not pixels, so it's complementary to visual-testing, not a replacement.
Scope snapshots to a stable container; whole-page snapshots over async content go flaky. See
references/patterns.md for navigation and form snapshot examples.
| Law / Standard | Region | WCAG level required | Enforcement |
|---|---|---|---|
| ADA | USA | AA (court precedent) | Lawsuits (private right of action) |
| Section 508 | USA (federal) | WCAG 2.0 AA | Federal procurement requirement |
| EAA | EU | EN 301 549 (WCAG 2.1 AA) | In force since 28 June 2025. Member states actively enforcing; private cause of action varies (DE, FR, IE most active). EN 301 549 expected to align with WCAG 2.2 next revision. |
| AODA | Ontario, Canada | WCAG 2.0 AA | Fines up to $100K/day |
| EN 301 549 | EU | WCAG 2.1 AA | Public procurement requirement |
| Equality Act 2010 | UK | WCAG 2.1 AA (guidance) | Lawsuits |
| ISO/IEC 40500:2025 | International | Equivalent to WCAG 2.2 (Oct 2023) | Useful for procurement/RFP language; freely available from ISO |
Practical target: if you serve US or EU users, WCAG 2.2 AA is the target for new development — the EAA is in force, EN 301 549 is expected to update to 2.2, and ISO/IEC 40500:2025 (published Sept 2025) codifies WCAG 2.2 internationally. WCAG 2.1 AA is the legacy minimum where 2.2 can't be reached immediately.
WCAG 3 status: W3C published an updated WCAG 3 working draft in March 2026 that renamed "Outcomes" to "Requirements" and moved away from binary pass/fail grading; it lists ~174 requirements. It remains a workin
name: accessibility-testing description: >- Test for WCAG 2.2 AA compliance with axe-core + Playwright, keyboard navigation audits, screen reader testing, ARIA pattern validation, and legal compliance mapping (ADA, EAA, Section 508). Automated tools catch 30-40% of issues — this skill covers automated and manual testing together. Use when: "accessibility," "a11y," "WCAG," "screen reader," "axe," "keyboard navigation," "ARIA," "ADA compliance." Not for: cookie-consent/GDPR compliance — use compliance-testing; pixel-diff visual regression — use visual-testing. Related: playwright-automation, compliance-testing, visual-testing, ci-cd-integration. license: MIT metadata: author: kindlmann version: "2.0" category: specialized
--- name: accessibility-testing description: >- Test for WCAG 2.2 AA compliance with axe-core + Playwright, keyboard navigation audits, screen reader testing, ARIA pattern validation, and legal compliance mapping (ADA, EAA, Section 508). Automated tools catch 30-40% of issues — this skill covers automated and manual testing together. Use when: "accessibility," "a11y," "WCAG," "screen reader," "axe," "keyboard navigation," "ARIA," "ADA compliance." Not for: cookie-consent/GDPR compliance — use compliance-testing; pixel-diff visual regression — use visual-testing. Related: playwright-automation, compliance-testing, visual-testing, ci-cd-integration. license: MIT metadata: author: kindlmann version: "2.0" category: specialized --- <objective> Make an application usable by people who rely on keyboards and assistive technology, and prove it with tests that run in CI. A button that passes `toBeVisible()` can still be unreachable by keyboard; a page with zero axe violations can still be impossible to operate with a screen reader. Automated tools catch 30-40% of accessibility issues — this skill covers the automated scan plus the keyboard, screen reader, and ARIA-state testing that catch the other 60-70%. </objective> ## Discovery Questions Check `.agents/qa-project-context.md` first — if it exists, use it as the foundation and skip anything already answered. **Requirements and compliance** (sets the target level and audit obligations) - What WCAG conformance level is required — A, AA, or AAA? AA is the practical legal default. - What laws apply — ADA, EAA/EN 301 549, Section 508, AODA? Each maps to a WCAG level. - Is there a VPAT or accessibility statement to maintain, or contractual a11y clauses from enterprise/government customers? **Current state** (tells you whether you're auditing or preventing regressions) - Has an audit run before? What were the findings, and what's already in the backlog? - Does the design system carry accessibility guidance and accessible components? **Testing infrastructure** (determines what you can automate vs. must do by hand) - Is automated a11y testing already in CI? - Which screen readers does the team test with — VoiceOver, NVDA, JAWS, TalkBack? ## Core Principles 1. **Automated testing catches 30-40% of issues — no more.** axe-core finds missing alt text, low contrast, missing labels, and invalid ARIA. It cannot tell you whether alt text is meaningful, whether tab order is logical, or whether a custom widget is operable. Passing axe is necessary, not sufficient. Crucially, axe ships **no automated rule** for several WCAG 2.2 success criteria (2.4.11 focus-not-obscured, 2.5.7 dragging movements, and 2.5.8 target-size only partially) — a green axe run does not equal 2.2 AA conformance. 2. **Semantic HTML first, ARIA as last resort.** Native elements (`<button>`, `<nav>`, `<input>`, `<dialog>`) carry built-in semantics, keyboard behavior, and screen reader support. A `<div role="button">` also needs `tabindex`, Enter/Space handlers, focus styles, and ARIA state — all of which a `<button>` gives you free. Reach for ARIA only when no native element fits. 3. **Test in impact order: keyboard, screen reader, automated.** Keyboard issues physically block users from features (highest impact). Screen reader issues confuse with wrong announcements. Automated checks catch the mechanical remainder. Start where the damage is worst, not where the tooling is easiest. 4. **Accessibility is a quality attribute, not a feature.** Test it continuously like performance or security — every new component, every PR. Retrofitting accessibility onto a finished product costs 10-100x more because inaccessible patterns get baked into the component library. 5. **Test with real assistive technology.** Browser DevTools and axe extensions are dev aids, not substitutes for VoiceOver (macOS/iOS), NVDA (Windows), and TalkBack (Android), which each behave differently. Reserve manual AT passes for complex custom widgets. ## Automated Scanning with axe-core + Playwright Install `@axe-core/playwright` (the 4.11.x line; it tracks axe-core's major.minor). Wrap it in a reusable `checkAccessibility(page, testInfo, options)` helper that filters to the WCAG tags `['wcag2a', 'wcag2aa', 'wcag22aa']`, attaches the full results JSON to the test for the audit trail, and asserts `violations.toHaveLength(0)`. Loop it over every key page and over interactive states (modal open, menu expanded), not just the default load. Suppress a rule only with a documented justification (a tracking issue or inline comment) and `exclude` third-party widgets you don't own rather than disabling the rule globally. See `references/recipes.md` for the install command, RGAA tag caveat, the full helper, the page-loop and interactive-state specs, rule suppression, and CI integration. ## Manual Testing Checklist Automated scanning is the floor. These checks need a human (or a keyboard-driven Playwright spec — see `references/recipes.md` for the keyboard specs). ### Keyboard navigation audit - [ ] **Tab order is logical** — left-to-right, top-to-bottom for LTR. No surprise focus jumps. - [ ] **All interactive elements reachable** via Tab / Shift+Tab. - [ ] **Focus indicator visible** on every focused element. No `outline: none` without a replacement. - [ ] **Skip link works** — first Tab reveals "Skip to main content"; Enter moves focus to `<main>`. - [ ] **Enter activates** buttons/links; **Space activates** buttons and toggles checkboxes. - [ ] **Escape closes** modals, dropdowns, tooltips; focus returns to the trigger. - [ ] **Arrow keys** navigate within tabs, menus, radio groups, tree views. - [ ] **No keyboard traps** (modal dialogs intentionally trap until dismissed — that's allowed). - [ ] **Custom widgets operable** without a mouse (sliders, date pickers, drag-and-drop). ### Screen reader testing | Screen Reader | OS | Browser | Free? | |--------------|-----|---------|-------| | VoiceOver | macOS/iOS | Safari | Yes (Cmd+F5) | | NVDA | Windows | Firefox/Chrome | Yes | | JAWS | Windows | Chrome/Edge | No | | TalkBack | Android | Chrome | Yes | - [ ] Page title announced on navigation. - [ ] Headings form a navigable outline (h1 → h2 → h3, no skipped levels). - [ ] Images have descriptive alt text (or `alt=""` for decorative). - [ ] Form inputs announce their labels when focused. - [ ] Required fields announced as required; errors associated with their input. - [ ] Live regions announce dynamic content (toasts, loading states). - [ ] Buttons/links announce their purpose (no "click here"). ### Color contrast and visual - [ ] Normal text: **4.5:1** minimum (WCAG AA). Large text (18pt+ / 14pt+ bold): **3:1**. - [ ] UI components and graphical objects: **3:1** against adjacent colors. - [ ] Information never conveyed by color alone — add icons, patterns, or text. ### Form and error accessibility - [ ] Every input has a visible `<label>` tied via `for`/`id` (placeholder is not a label). - [ ] Required fields indicated visually **and** programmatically (`required` / `aria-required`). - [ ] Errors use `aria-describedby` to link to the input and `role="alert"` to announce. - [ ] Focus moves to the first error on submission failure. - [ ] Related fields grouped with `<fieldset>` and `<legend>`. ## WCAG 2.2 Quick Reference ### Level A (must fix) | Criterion | What it means | Common failure | |-----------|--------------|---------------| | 1.1.1 Non-text Content | Images have alt text | `<img>` without `alt` | | 1.3.1 Info and Relationships | Structure via HTML semantics | `<div>` styled as a heading | | 2.1.1 Keyboard | All functionality via keyboard | Custom widget responds only to mouse | | 2.4.1 Bypass Blocks | Skip navigation link | No skip link | | 3.1.1 Language of Page | `<html lang="en">` set | Missing `lang` | | 3.3.1 Error Identification | Errors described in text | Error shown only by red border | | 4.1.2 Name, Role, Value | Custom controls expose name/role | `<div onclick>` with no role | ### Level AA (most common legal requirement) | Criterion | What it means | Common failure | |-----------|--------------|---------------| | 1.4.3 Contrast (Minimum) | 4.5:1 normal, 3:1 large | Light gray on white | | 1.4.4 Resize Text | Scales to 200% without loss | Fixed-height containers clip text | | 1.4.11 Non-text Contrast | UI components 3:1 | Low-contrast input borders | | 2.4.7 Focus Visible | Keyboard focus visible | `outline: none` with no replacement | | 2.5.8 Target Size | Touch targets 24×24px min | Tiny icon buttons | | 3.3.2 Labels or Instructions | Inputs have labels | Placeholder as the only label | | 3.3.8 Accessible Auth | No cognitive function test | CAPTCHA with no alternative | ### Level AAA (nice to have) | Criterion | What it means | |-----------|--------------| | 1.4.6 Contrast (Enhanced) | 7:1 normal text, 4.5:1 large | | 2.4.9 Link Purpose (Link Only) | Link text alone describes destination | | 3.1.5 Reading Level | Lower-secondary education level | ## Accessible Patterns Test on the accessible tree (roles, names, ARIA state), not on CSS. The patterns you need runnable tests for: - **Forms** — error linked via `aria-describedby`, `aria-invalid='true'`, focus on first error. - **Modal/dialog** — `aria-modal='true'`, `aria-labelledby`, focus trapped, Escape returns focus. - **Interactive states** — opened dropdown (`role="menu"` or `role="listbox"`, `aria-expanded`), loading skeleton (`aria-busy='true'` during fetch), toast (`aria-live='polite'`). These carry different ARIA per state, so click to trigger the state change and assert the open-state ARIA — the default page snapshot never exercises them. - **Data tables** — `columnheader` roles, `aria-sort` reflects the active sort. - **Landmarks** — exactly one `main`; `banner`, `navigation`, `contentinfo` present. See `references/patterns.md` for the full runnable tests for every pattern above. ## ARIA Snapshots Playwright's `toMatchAriaSnapshot()` captures the accessible tree as YAML and asserts against it — the fastest way to catch a regression where a visual change silently breaks semantics (a `<div>` restyled to look like a button, a heading demoted to plain text). It checks structure and accessible names, not pixels, so it's complementary to `visual-testing`, not a replacement. Scope snapshots to a stable container; whole-page snapshots over async content go flaky. See `references/patterns.md` for navigation and form snapshot examples. ## Legal Compliance Mapping | Law / Standard | Region | WCAG level required | Enforcement | |---------------|--------|-------------------|------------| | **ADA** | USA | AA (court precedent) | Lawsuits (private right of action) | | **Section 508** | USA (federal) | WCAG 2.0 AA | Federal procurement requirement | | **EAA** | EU | EN 301 549 (WCAG 2.1 AA) | **In force since 28 June 2025.** Member states actively enforcing; private cause of action varies (DE, FR, IE most active). EN 301 549 expected to align with WCAG 2.2 next revision. | | **AODA** | Ontario, Canada | WCAG 2.0 AA | Fines up to $100K/day | | **EN 301 549** | EU | WCAG 2.1 AA | Public procurement requirement | | **Equality Act 2010** | UK | WCAG 2.1 AA (guidance) | Lawsuits | | **ISO/IEC 40500:2025** | International | Equivalent to WCAG 2.2 (Oct 2023) | Useful for procurement/RFP language; freely available from ISO | **Practical target:** if you serve US or EU users, **WCAG 2.2 AA is the target for new development** — the EAA is in force, EN 301 549 is expected to update to 2.2, and ISO/IEC 40500:2025 (published Sept 2025) codifies WCAG 2.2 internationally. WCAG 2.1 AA is the legacy minimum where 2.2 can't be reached immediately. **WCAG 3 status:** W3C published an updated WCAG 3 working draft in March 2026 that renamed "Outcomes" to "Requirements" and moved away from binary pass/fail grading; it lists ~174 requirements. It remains a workin
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
61/100
Promising
Trust
62/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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"uniqueAgents": 0,
"lastOutcomeAt": null
},
"signals": [],
"penalties": [
"No real agent outcome evidence yet"
]
},
"audit": {
"score": 72,
"risk_level": "needs_review",
"risk_label": "Needs review",
"warnings": [
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"Financial research output is not financial advice; require human review before any live investment decision.",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution",
"Stars/forks activity: 108 stars, 22 forks; issue activity unavailable in current metadata",
"Dependency/runtime risk: credential or environment access, external package install surface"
]
},
"safety_gate": {
"tier": "blocked",
"label": "Blocked for auto-install",
"auto_install_policy": "block",
"auto_install_allowed": false,
"human_review_required": true,
"blocked": true,
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
},
"quality": {
"score": 61,
"label": "Promising"
},
"supply": {
"track": "Coding and developer agents",
"scenario": "Coding agents",
"maintenance": "4mo since push",
"risk": "Needs review"
},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"high-compliance environments without internal security review",
"No OpenAgentSkill engagement data yet",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Financial research output is not financial advice; require human review before any live investment decision",
"Financial research output is not financial advice; require human review before any live investment decision."
],
"agent_contract": {
"task_input": "Use accessibility-testing in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 70/100 Manual review",
"Audit: 72/100 Needs review",
"Safety: 32/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "petrkindlmann-accessibility-testing (accessibility-testing)",
"install_command": "npx skills add petrkindlmann/qa-skills --skill accessibility-testing",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "petrkindlmann-accessibility-testing",
"task": "Use accessibility-testing in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/petrkindlmann-accessibility-testing",
"api": "https://www.openagentskill.com/api/agent/skills/petrkindlmann-accessibility-testing",
"audit": "https://www.openagentskill.com/skills/petrkindlmann-accessibility-testing/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=petrkindlmann-accessibility-testing&task=Use%20accessibility-testing%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20accessibility-testing%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20accessibility-testing%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/petrkindlmann-accessibility-testing/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/petrkindlmann-accessibility-testing"
}
}Listing source
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Audit
72/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.