HTML
HTML (HyperText Markup Language) is the standard markup language for documents designed to be displayed in a web browser. It defines the meaning and structure of web content. It is, perhaps, one of the best inventions of the Internet.
- HTML HEAD is a simple guide to HTML
<head>elements. (source | archive) - HTML5 Boilerplate helps you build fast, robust, and adaptable web apps or sites. (source)
- A Blog Post With Every HTML Element (archive)