# HTML & Markup Reference Comprehensive reference for HTML5, markup languages, and document structure. ## Core Concepts ### HTML (HyperText Markup Language) The standard markup language for creating web pages and web applications. **Related Terms**: HTML5, XHTML, Markup, Semantic HTML ### Elements Building blocks of HTML documents. Each element has opening/closing tags (except void elements). **Common Elements**: - `
` - Generic container - `` - Inline container - `
` - Self-contained content - `
` - Thematic grouping - `