Claude-skill-registry check-headings

Analyze and validate HTML heading hierarchy (H1-H6) on web pages. Use when users ask to check headings structure, verify H1 presence, analyze SEO heading hierarchy, find heading issues, or audit page structure. Detects missing H1, multiple H1s, skipped levels, empty headings, and hierarchy violations.

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/check-headings" ~/.claude/skills/majiayu000-claude-skill-registry-check-headings && rm -rf "$T"

manifest: skills/data/check-headings/SKILL.md

Check Headings

Analyze and validate HTML heading hierarchy (H1-H6) on web pages for SEO and accessibility compliance.

Quick Start

Run the heading checker from the scripts directory:

cd /path/to/html-checker/scripts
bun src/check-headings.ts <URL>

CLI Options

Option	Short	Default	Description
`--verbose`	`-v`	false	Show detailed heading content
`--json`	`-j`	false	Output results as JSON

Checks Performed

Check	Severity	Description
Missing H1	Error	Page has no H1 heading
Multiple H1	Warning	Page has more than one H1
Skipped Level	Warning	Heading level skipped (e.g., H2 to H4)
Empty Heading	Error	Heading tag with no text content
Wrong Order	Warning	Heading appears before its parent level

Usage Examples

Basic check

bun src/check-headings.ts https://example.com

Verbose output with heading content

bun src/check-headings.ts https://example.com --verbose

JSON output for automation

bun src/check-headings.ts https://example.com --json

Output

The checker provides:

Summary - Total headings found per level
Issues - List of problems with severity
Hierarchy - Visual tree of heading structure
Recommendations - Actionable fixes

Example Output

Heading Analysis for https://example.com

Summary:
  H1: 1  H2: 5  H3: 12  H4: 3  H5: 0  H6: 0

Issues Found: 2
  [WARNING] Skipped level: H2 -> H4 at line 45
  [ERROR] Empty heading: H3 at line 78

Hierarchy:
  H1: Welcome to Example
    H2: About Us
      H3: Our Mission
      H3: Our Team
    H2: Services
      H4: Web Development  <-- Skipped H3

SEO Best Practices

One H1 per page: The H1 should match the page's main topic
Sequential hierarchy: Don't skip levels (H2 -> H4)
Descriptive headings: Avoid generic text like "Read More"
Keyword inclusion: Include target keywords naturally
Logical structure: Headings should outline page content

Accessibility (WCAG)

SC 1.3.1: Headings must convey structure
SC 2.4.6: Headings must be descriptive
SC 2.4.10: Section headings organize content

Related Files

Scripts:
```
/plugins/html-checker/scripts/
```

Check Links:

/plugins/html-checker/skills/check-links/