web-quality-audit

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Comprehensive web quality audit covering performance, accessibility, SEO, and best practices. Use when asked to "audit my site", "review web quality", "run lighthouse audit", "check page quality", or "optimize my website".

1installs

Sourcetech-leads-club/agent-skills

Added on2026-02-08

NPX Install

npx skill4agent add tech-leads-club/agent-skills web-quality-audit

SKILL.md Content

Web quality audit

Comprehensive quality review based on Google Lighthouse audits. Covers Performance, Accessibility, SEO, and Best Practices across 150+ checks.

How it works

Analyze the provided code/project for quality issues
Categorize findings by severity (Critical, High, Medium, Low)
Provide specific, actionable recommendations
Include code examples for fixes

Audit categories

Performance (40% of typical issues)

Core Web Vitals — Must pass for good page experience:

LCP (Largest Contentful Paint) < 2.5s. The largest visible element must render quickly. Optimize images, fonts, and server response time.
INP (Interaction to Next Paint) < 200ms. User interactions must feel instant. Reduce JavaScript execution time and break up long tasks.
CLS (Cumulative Layout Shift) < 0.1. Content must not jump around. Set explicit dimensions on images, embeds, and ads.

Resource Optimization:

Compress images. Use WebP/AVIF with fallbacks. Serve correctly sized images via
```
srcset
```
.
Minimize JavaScript. Remove unused code. Use code splitting. Defer non-critical scripts.
Optimize CSS. Extract critical CSS. Remove unused styles. Avoid
```
@import
```
.
Efficient fonts. Use
```
font-display: swap
```
. Preload critical fonts. Subset to needed characters.

Loading Strategy:

Preconnect to origins. Add
```
<link rel="preconnect">
```
for third-party domains.
Preload critical assets. LCP images, fonts, and above-fold CSS.
Lazy load below-fold content. Images, iframes, and heavy components.
Cache effectively. Long cache TTLs for static assets. Immutable caching for hashed files.

Accessibility (30% of typical issues)

Perceivable:

Text alternatives. Every
```
<img>
```
has meaningful
```
alt
```
text. Decorative images use
```
alt=""
```
.
Color contrast. Minimum 4.5:1 for normal text, 3:1 for large text (WCAG AA).
Don't rely on color alone. Use icons, patterns, or text alongside color indicators.
Captions and transcripts. Video has captions. Audio has transcripts.

Operable:

Keyboard accessible. All functionality available via keyboard. No keyboard traps.
Focus visible. Clear focus indicators on all interactive elements.
Skip links. Provide "Skip to main content" for keyboard users.
Sufficient time. Users can extend time limits. No auto-advancing content without controls.

Understandable:

Page language. Set
```
lang
```
attribute on
```
<html>
```
.
Consistent navigation. Same navigation structure across pages.
Error identification. Form errors clearly described and associated with fields.
Labels and instructions. All form inputs have associated labels.

Robust:

Valid HTML. No duplicate IDs. Properly nested elements.
ARIA used correctly. Prefer native elements. ARIA roles match behavior.
Name, role, value. Interactive elements have accessible names and correct roles.

SEO (15% of typical issues)

Crawlability:

Valid robots.txt. Doesn't block important resources.
XML sitemap. Lists all important pages. Submitted to Search Console.
Canonical URLs. Prevent duplicate content issues.
No noindex on important pages. Check meta robots and headers.

On-Page SEO:

Unique title tags. 50-60 characters. Primary keyword included.
Meta descriptions. 150-160 characters. Compelling and unique.
Heading hierarchy. Single
```
<h1>
```
. Logical heading structure.
Descriptive link text. Not "click here" or "read more".

Technical SEO:

Mobile-friendly. Responsive design. Tap targets ≥ 48px.
HTTPS. Secure connection required.
Fast loading. Performance directly impacts ranking.
Structured data. JSON-LD for rich snippets (Article, Product, FAQ, etc.).

Best practices (15% of typical issues)

Security:

HTTPS everywhere. No mixed content. HSTS enabled.
No vulnerable libraries. Keep dependencies updated.
CSP headers. Content Security Policy to prevent XSS.
No exposed source maps. In production builds.

Modern Standards:

No deprecated APIs. Replace
```
document.write
```
, synchronous XHR, etc.
Valid doctype. Use
```
<!DOCTYPE html>
```
.
Charset declared.
```
<meta charset="UTF-8">
```
as first element in
```
<head>
```
.
No browser errors. Clean console. No CORS issues.

UX Patterns:

No intrusive interstitials. Especially on mobile.
Clear permission requests. Only ask when needed, with context.
No misleading buttons. Buttons do what they say.

Severity levels

Level	Description	Action
Critical	Security vulnerabilities, complete failures	Fix immediately
High	Core Web Vitals failures, major a11y barriers	Fix before launch
Medium	Performance opportunities, SEO improvements	Fix within sprint
Low	Minor optimizations, code quality	Fix when convenient

Audit output format

When performing an audit, structure findings as:

markdown

## Audit results

### Critical issues (X found)

- **[Category]** Issue description. File: `path/to/file.js:123`
  - **Impact:** Why this matters
  - **Fix:** Specific code change or recommendation

### High priority (X found)

...

### Summary

- Performance: X issues (Y critical)
- Accessibility: X issues (Y critical)
- SEO: X issues
- Best Practices: X issues

### Recommended priority

1. First fix this because...
2. Then address...
3. Finally optimize...

Quick checklist

Before every deploy

Core Web Vitals passing
No accessibility errors (axe/Lighthouse)
No console errors
HTTPS working
Meta tags present

Weekly review

Check Search Console for issues
Review Core Web Vitals trends
Update dependencies
Test with screen reader

Monthly deep dive

Full Lighthouse audit
Performance profiling
Accessibility audit with real users
SEO keyword review

References

For detailed guidelines on specific areas:

Performance Optimization
Core Web Vitals
Accessibility
SEO
Best Practices