| name | accessibility-audit |
| description | Audit web pages for accessibility issues, WCAG compliance, and screen reader compatibility.
Trigger when the user asks to: check accessibility, run an a11y audit, test WCAG compliance,
check screen reader support, audit ARIA attributes, verify keyboard navigation,
find accessibility issues, or check for missing alt text or labels.
|
| allowed-tools | Bash(openbrowser-ai:*) Bash(curl:*) Bash(uv:*) Bash(irm:*) Read Write |
Accessibility Audit
Audit web pages for accessibility issues following WCAG 2.1 guidelines using Python code execution. Checks heading structure, form labels, image alt text, ARIA attributes, landmark regions, and keyboard navigation.
All code runs via openbrowser-ai -c. The daemon starts automatically and persists variables across calls. All browser functions are async -- use await.
The CLI daemon also persists cookies and login state in ~/.config/openbrowser/profiles/daemon/storage_state.json, so authenticated sessions can be reused across later runs.
Setup
Before running, verify openbrowser-ai is installed:
openbrowser-ai --help
If not found, install:
curl -fsSL https://raw.githubusercontent.com/billy-enrizky/openbrowser-ai/main/install.sh | sh
irm https://raw.githubusercontent.com/billy-enrizky/openbrowser-ai/main/install.ps1 | iex
Workflow
Step 1 -- Navigate and initialize audit
openbrowser-ai -c - <<'EOF'
await navigate("https://example.com")
state = await browser.get_browser_state_summary()
print(f"Auditing: {state.title} ({state.url})")
audit = {
"url": state.url,
"title": state.title,
"issues": [],
"checks": {}
}
EOF
Step 2 -- Check heading structure
openbrowser-ai -c - <<'EOF'
headings_result = await evaluate("""
(function(){
const headings = Array.from(document.querySelectorAll("h1,h2,h3,h4,h5,h6"));
const issues = [];
let prevLevel = 0;
const h1Count = headings.filter(h => h.tagName === "H1").length;
if (h1Count === 0) issues.push("No h1 element found");
if (h1Count > 1) issues.push("Multiple h1 elements: " + h1Count);
headings.forEach(h => {
const level = parseInt(h.tagName[1]);
if (prevLevel > 0 && level > prevLevel + 1)
issues.push("Skipped level: h" + prevLevel + " -> h" + level + " (\"" + h.textContent.trim().substring(0, 50) + "\")");
if (!h.textContent.trim())
issues.push("Empty heading: " + h.tagName);
prevLevel = level;
});
return {
total: headings.length,
h1Count,
hierarchy: headings.map(h => ({ tag: h.tagName, text: h.textContent.trim().substring(0, 80) })),
issues
};
})()
""")
audit["checks"]["headings"] = headings_result
for issue in headings_result.get("issues", []):
audit["issues"].append({"check": "headings", "wcag": "1.3.1", "issue": issue})
print(f"[HEADINGS] {issue}")
if not headings_result.get("issues"):
print("[HEADINGS] PASS")
EOF
Step 3 -- Check images for alt text
openbrowser-ai -c - <<'EOF'
images_result = await evaluate("""
(function(){
const images = Array.from(document.querySelectorAll("img"));
const issues = [];
let withAlt = 0, withEmptyAlt = 0, missingAlt = 0;
images.forEach(img => {
const alt = img.getAttribute("alt");
const src = img.src?.substring(0, 100);
if (alt === null) {
missingAlt++;
issues.push("Missing alt: " + src);
} else if (alt === "") {
withEmptyAlt++;
} else {
withAlt++;
}
});
return { total: images.length, withAlt, withEmptyAlt, missingAlt, issues };
})()
""")
audit["checks"]["images"] = images_result
for issue in images_result.get("issues", []):
audit["issues"].append({"check": "images", "wcag": "1.1.1", "issue": issue})
print(f"[IMAGES] {issue}")
if not images_result.get("issues"):
total = images_result["total"]
with_alt = images_result["withAlt"]
print(f"[IMAGES] PASS ({total} images, {with_alt} with alt)")
EOF
Step 4 -- Check form labels
openbrowser-ai -c - <<'EOF'
forms_result = await evaluate("""
(function(){
const inputs = Array.from(document.querySelectorAll("input:not([type=\"hidden\"]),select,textarea"));
const issues = [];
inputs.forEach(input => {
const id = input.id;
const ariaLabel = input.getAttribute("aria-label");
const ariaLabelledBy = input.getAttribute("aria-labelledby");
const title = input.getAttribute("title");
const label = id ? document.querySelector("label[for=\"" + id + "\"]") : null;
const parentLabel = input.closest("label");
const hasLabel = label || parentLabel || ariaLabel || ariaLabelledBy || title;
if (!hasLabel) {
issues.push({
tag: input.tagName,
type: input.type || "text",
name: input.name || "(none)",
placeholder: input.getAttribute("placeholder") || "(none)",
issue: "No label or aria-label"
});
}
});
return { totalInputs: inputs.length, unlabeled: issues.length, issues };
})()
""")
audit["checks"]["forms"] = forms_result
for issue in forms_result.get("issues", []):
tag = issue["tag"]
name = issue["name"]
itype = issue["type"]
audit["issues"].append({"check": "forms", "wcag": "1.3.1", "issue": f"Unlabeled {tag} name={name}"})
print(f"[FORMS] Unlabeled: <{tag}> type={itype} name={name}")
if not forms_result.get("issues"):
total_inputs = forms_result["totalInputs"]
print(f"[FORMS] PASS ({total_inputs} inputs, all labeled)")
EOF
Step 5 -- Check ARIA attributes
openbrowser-ai -c - <<'EOF'
aria_result = await evaluate("""
(function(){
const issues = [];
const ariaElements = document.querySelectorAll("[role],[aria-label],[aria-labelledby],[aria-describedby],[aria-hidden]");
ariaElements.forEach(el => {
const ariaLabelledBy = el.getAttribute("aria-labelledby");
const ariaDescribedBy = el.getAttribute("aria-describedby");
if (ariaLabelledBy) {
ariaLabelledBy.split(/\s+/).forEach(id => {
if (!document.getElementById(id))
issues.push({ element: el.tagName, issue: "aria-labelledby references missing id: " + id });
});
}
if (ariaDescribedBy) {
ariaDescribedBy.split(/\s+/).forEach(id => {
if (!document.getElementById(id))
issues.push({ element: el.tagName, issue: "aria-describedby references missing id: " + id });
});
}
if (el.getAttribute("role") === "button" && !el.getAttribute("aria-label") && !el.textContent.trim())
issues.push({ element: el.tagName, issue: "Button role with no accessible name" });
if (el.getAttribute("aria-hidden") === "true" && el.querySelector("a,button,input,select,textarea,[tabindex]"))
issues.push({ element: el.tagName, issue: "aria-hidden on element with focusable children" });
});
return { totalAriaElements: ariaElements.length, issues };
})()
""")
audit["checks"]["aria"] = aria_result
for issue in aria_result.get("issues", []):
msg = issue["issue"]
audit["issues"].append({"check": "aria", "wcag": "4.1.2", "issue": msg})
print(f"[ARIA] {msg}")
if not aria_result.get("issues"):
total_aria = aria_result["totalAriaElements"]
print(f"[ARIA] PASS ({total_aria} ARIA elements)")
EOF
Step 6 -- Check landmark regions
openbrowser-ai -c - <<'EOF'
landmarks_result = await evaluate("""
(function(){
const landmarks = {
banner: document.querySelectorAll("header,[role=\"banner\"]").length,
navigation: document.querySelectorAll("nav,[role=\"navigation\"]").length,
main: document.querySelectorAll("main,[role=\"main\"]").length,
contentinfo: document.querySelectorAll("footer,[role=\"contentinfo\"]").length,
complementary: document.querySelectorAll("aside,[role=\"complementary\"]").length,
search: document.querySelectorAll("[role=\"search\"]").length
};
const issues = [];
if (landmarks.main === 0) issues.push("No main landmark");
if (landmarks.main > 1) issues.push("Multiple main landmarks: " + landmarks.main);
if (landmarks.banner === 0) issues.push("No banner/header landmark");
if (landmarks.navigation === 0) issues.push("No navigation landmark");
if (landmarks.contentinfo === 0) issues.push("No footer/contentinfo landmark");
return { landmarks, issues };
})()
""")
audit["checks"]["landmarks"] = landmarks_result
for issue in landmarks_result.get("issues", []):
audit["issues"].append({"check": "landmarks", "wcag": "1.3.1", "issue": issue})
print(f"[LANDMARKS] {issue}")
if not landmarks_result.get("issues"):
print("[LANDMARKS] PASS")
EOF
Step 7 -- Check links and buttons
openbrowser-ai -c - <<'EOF'
links_result = await evaluate("""
(function(){
const issues = [];
document.querySelectorAll("a").forEach(a => {
const name = a.textContent.trim() || a.getAttribute("aria-label") || a.getAttribute("title") || a.querySelector("img[alt]")?.alt;
if (!name) issues.push({ tag: "a", href: a.href?.substring(0, 80), issue: "No accessible name" });
else if (["click here", "here", "read more", "more", "link"].includes(name.toLowerCase()))
issues.push({ tag: "a", text: name, issue: "Non-descriptive link text" });
});
document.querySelectorAll("button,[role=\"button\"]").forEach(btn => {
const name = btn.textContent.trim() || btn.getAttribute("aria-label") || btn.getAttribute("title");
if (!name) issues.push({ tag: btn.tagName, issue: "Button with no accessible name" });
});
return { issues };
})()
""")
audit["checks"]["links_buttons"] = links_result
for issue in links_result.get("issues", []):
msg = issue["issue"]
audit["issues"].append({"check": "links_buttons", "wcag": "2.4.4", "issue": msg})
print(f"[LINKS/BUTTONS] {msg}")
if not links_result.get("issues"):
print("[LINKS/BUTTONS] PASS")
EOF
Step 8 -- Check keyboard navigation
openbrowser-ai -c - <<'EOF'
keyboard_result = await evaluate("""
(function(){
const focusable = Array.from(document.querySelectorAll("a[href],button,input:not([type=\"hidden\"]),select,textarea,[tabindex]"));
const issues = [];
const positiveTabindex = focusable.filter(el => parseInt(el.getAttribute("tabindex")) > 0);
const negativeTabindex = focusable.filter(el => {
const ti = parseInt(el.getAttribute("tabindex"));
return ti < 0 && ["A","BUTTON","INPUT","SELECT","TEXTAREA"].includes(el.tagName);
});
if (positiveTabindex.length > 0)
issues.push("Elements with positive tabindex (disrupts tab order): " + positiveTabindex.length);
if (negativeTabindex.length > 0)
issues.push("Interactive elements removed from tab order: " + negativeTabindex.length);
return { totalFocusable: focusable.length, positiveTabindex: positiveTabindex.length, negativeTabindex: negativeTabindex.length, issues };
})()
""")
audit["checks"]["keyboard"] = keyboard_result
for issue in keyboard_result.get("issues", []):
audit["issues"].append({"check": "keyboard", "wcag": "2.4.3", "issue": issue})
print(f"[KEYBOARD] {issue}")
if not keyboard_result.get("issues"):
total_focusable = keyboard_result["totalFocusable"]
print(f"[KEYBOARD] PASS ({total_focusable} focusable elements)")
EOF
Step 9 -- Compile audit report
openbrowser-ai -c - <<'EOF'
import json
total_issues = len(audit["issues"])
checks_passed = sum(1 for c in audit["checks"].values() if not c.get("issues"))
checks_total = len(audit["checks"])
url = audit["url"]
title = audit["title"]
print(f"\n=== Accessibility Audit Report ===")
print(f"URL: {url}")
print(f"Title: {title}")
print(f"Checks: {checks_passed}/{checks_total} passed")
print(f"Total issues: {total_issues}")
if total_issues > 0:
print(f"\nIssues by WCAG criterion:")
by_wcag = {}
for issue in audit["issues"]:
by_wcag.setdefault(issue["wcag"], []).append(issue)
for wcag, issues in sorted(by_wcag.items()):
print(f" {wcag}: {len(issues)} issues")
for i in issues[:3]:
msg = i["issue"]
print(f" - {msg}")
if len(issues) > 3:
print(f" ... and {len(issues) - 3} more")
EOF
WCAG Quick Reference
| Check | WCAG Criterion | Level |
|---|
| Images have alt text | 1.1.1 Non-text Content | A |
| Heading hierarchy is logical | 1.3.1 Info and Relationships | A |
| Form inputs have labels | 1.3.1 Info and Relationships | A |
| Link purpose is clear | 2.4.4 Link Purpose (In Context) | A |
| Landmark regions present | 1.3.1 Info and Relationships | A |
| Focus order is logical | 2.4.3 Focus Order | A |
| ARIA attributes valid | 4.1.2 Name, Role, Value | A |
Tips
- Code is piped via stdin using heredoc (
-c - <<'EOF'), so all Python syntax works without shell escaping issues.
- Store results in the
audit dict -- variables persist between -c calls while the daemon is running.
- Run audits on multiple pages, not just the homepage.
- ARIA misuse is often worse than no ARIA at all.
- The heading check catches the most common structural issues.
- Missing form labels are the most common form accessibility failure.
Cleanup
This step is mandatory. Run it after the task finishes, whether the audit succeeded or failed. Without it, the daemon keeps Chrome running until its 10-minute idle timeout, leaving a stale browser process, a locked profile, and (on macOS/Linux desktop) a visible window.
Stop the daemon, then verify it is gone:
openbrowser-ai daemon stop
openbrowser-ai daemon status
daemon stop closes every tab, exits Chrome, flushes saved cookies/login state to the profile, and shuts down the daemon process. daemon status should report the daemon is not running. If it still reports running, the daemon is wedged, force-kill it:
pkill -f 'openbrowser.*daemon' || true
If your skill invocation can fail mid-workflow (network error, assertion failure, CDP timeout), guarantee cleanup with a shell trap so the browser is never left orphaned:
trap 'openbrowser-ai daemon stop >/dev/null 2>&1 || true' EXIT
Do not rely on the idle timeout. Do not call done() as a substitute, done() only marks the task complete inside the agent loop, it does not close the browser.
