# HTML
> Guidelines for semantic HTML markup, document structure, forms, accessibility attributes, and modern HTML best practices Use when this capability is needed.
- Skill: `tomevault-io/html` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/html`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/html/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/html
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# HTML Development Guidelines
## Core Principles
- Write semantic HTML to improve accessibility and SEO
- Use appropriate elements for their intended purpose
- Ensure proper document structure and hierarchy
- Prioritize accessibility by using ARIA roles and attributes when needed
## Semantic Elements
### Document Structure
- Use `` for introductory content and navigation
- Use `` for the primary content (one per page)
- Use `