What problem does it solve? Markdown cannot carry the information density needed for share-once expository content like PR walkthroughs, design explorations, or incident reports. This Skill produces standalone, dependency-free HTML documents with styled tables, SVG diagrams, syntax-highlighted code, and interactive elements that share as a single link. ## Core Features & Use Cases - Five artifact categories: specs and planning explorations, code review and understanding documents, design systems and prototypes, reports and research explainers, and custom editing interfaces. - 21 reference templates: A bundled gallery of self-contained HTML examples (10-25 KB each) that the agent reads lazily, one at a time, matching the requested artifact type. - Design system integration: Resolves a named design system from project or user scope and inlines its colors, typography, components, and base64-encoded images into the artifact. - Use Case: After reviewing a pull request, ask for an HTML review summary and receive a single file with a risk map, per-file diffs, inline comment bubbles, and a next-steps checklist. ## Quick Start Create an HTML walkthrough explaining how authentication flows through this codebase, using the code-understanding reference style.