This repository is a comprehensive, community-maintained reference guide for HTML `<head>` elements. It catalogs recommended meta tags, link relations, social media integration (Open Graph, Schema.org, Fediverse), browser-specific tags (iOS, Android, Chinese browsers), and deprecated elements. The project is purely documentation—not a software application, library, or data pipeline. It is widely used (over 30k stars) and actively maintained, with a GitHub Actions workflow that syncs the README to a GitHub Pages site (htmlhead.dev). The codebase consists of a single markdown file (README.md) and a deprecated elements file (DEPRECATED.md), plus a CI workflow. There are no executable components, tests, or reusable software modules. The value lies in its curated, up-to-date reference for web developers.