markdown-it-attrs is a lightweight plugin for the markdown‑it parser that lets authors add HTML classes, IDs and arbitrary attributes directly in Markdown using curly‑brace syntax (e.g., `{.class #id attr=value}`). It’s aimed at developers and writers who need fine‑grained control over the generated HTML without leaving the Markdown source, and works with headings, inline elements, code fences, tables, and custom blocks.