HTML Diagram

by plannotator

HTML Diagram is a Frontend skill for Claude Code, published by plannotator in effective-html.

1.7K stars130 forkson plannotator/effective-htmlAdded 2026/08/19+2% in starsRepository updated 2026/08/03

View source on GitHub Download repo ZIP

agent-skillsclaude-codecodexhtml-artifactshtml-prototypehtml-wireframeprototypingskills

Install in seconds

Install HTML Diagram

Copy HTML Diagram into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/plannotator/effective-html/tree/main/skills/html-diagram ~/.claude/skills/html-diagram

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/plannotator/effective-html.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: skills/html-diagram/SKILL.md in plannotator/effective-html
Installs to: ~/.claude/skills/html-diagram
Collection: One of 6 skills cataloged from this repository
Category: Frontend — 567 skills

What HTML Diagram does

HTML Diagram builds self-contained HTML files with inline CSS and JavaScript to create diagrams that clarify relationships, sequences, topologies, states, hierarchies, and quantitative structures. Use it when a visual model makes a relationship easier to understand than prose alone.

HTML Diagram is cataloged under Frontend on DirSkills. HTML Diagram comes from a repository tagged agent-skills, claude-code, codex, html-artifacts and html-prototype.

Documentation

README

Excerpt

HTML Diagram

Build the smallest visual model that makes the relationship easier to understand than prose alone. Match the notation and visual language to the user's project and subject. Do not force every topic into the same SVG boxes and arrows.

Choose the right model

Identify the question the reader should answer, then select the form:

topology for components and connections;
sequence for ordered messages over time;
process for steps, branches, and handoffs;
state for transitions and conditions;
hierarchy for containment or ownership;
timeline for change over time;
matrix for repeated relationships;
quantitative view when magnitude matters.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about HTML Diagram

What else does plannotator publish alongside HTML Diagram?
HTML Diagram is one of 6 skills that DirSkills catalogs from plannotator/effective-html, the repository it ships in. Its siblings there include Design Artifact, HTML Artifacts and HTML Plan. Each one is a separate skill with its own page in this directory, installs the same way HTML Diagram does, and is maintained by plannotator in that same repository. The rest of the collection is listed on the plannotator/effective-html page.
How does HTML Diagram compare to other Frontend skills?
HTML Diagram ranks #274 by stars among the 567 Frontend skills in this catalog. The most-starred ones next to it are Angular Developer, Android Clean Architecture and Accessibility. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of HTML Diagram against them. Open each page to compare what they document and how they install.