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check-headings

@majiayu000/claude-skill-registry
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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 Skill

1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

Note: Please verify skill by going through its instructions before using it.

SKILL.md

name check-headings
description 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.

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:

  1. Summary - Total headings found per level
  2. Issues - List of problems with severity
  3. Hierarchy - Visual tree of heading structure
  4. 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/