Shadcn Tailwind UI
LiarMTTT/TavernWeave
Build, restyle, or review accessible React interfaces that use shadcn/ui, Radix UI primitives, and Tailwind CSS.
Author a PostHog canvas with semantic HTML, CSS, and direct browser APIs — documents, articles, generative graphics, 2D canvas and WebGL experiences, and focused experiments where React components…
Install Building HTML Canvases
$ npx skills add PostHog/posthog --skill building-html-canvases -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install PostHog/posthog building-html-canvases --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .claude/skills && cp -r skills-src/products/canvas/skills/building-html-canvases .claude/skills/building-html-canvases && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "building-html-canvases" agent skill from https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvases into .claude/skills/building-html-canvases/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-html-canvases", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvasesType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add PostHog/posthog --skill building-html-canvases -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install PostHog/posthog building-html-canvases --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .agents/skills && cp -r skills-src/products/canvas/skills/building-html-canvases .agents/skills/building-html-canvases && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "building-html-canvases" agent skill from https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvases into .agents/skills/building-html-canvases/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-html-canvases", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add PostHog/posthog --skill building-html-canvases -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install PostHog/posthog building-html-canvases --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/products/canvas/skills/building-html-canvases .cursor/skills/building-html-canvases && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "building-html-canvases" agent skill from https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvases into .cursor/skills/building-html-canvases/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-html-canvases", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/PostHog/posthog.git --path products/canvas/skills/building-html-canvases--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add PostHog/posthog --skill building-html-canvases -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install PostHog/posthog building-html-canvases --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/products/canvas/skills/building-html-canvases .gemini/skills/building-html-canvases && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "building-html-canvases" agent skill from https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvases into .gemini/skills/building-html-canvases/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-html-canvases", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install PostHog/posthog building-html-canvasesInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add PostHog/posthog --skill building-html-canvases -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .github/skills && cp -r skills-src/products/canvas/skills/building-html-canvases .github/skills/building-html-canvases && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "building-html-canvases" agent skill from https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvases into .github/skills/building-html-canvases/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-html-canvases", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add PostHog/posthog --skill building-html-canvases -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install PostHog/posthog building-html-canvases --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/PostHog/posthog.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/products/canvas/skills/building-html-canvases .opencode/skills/building-html-canvases && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "building-html-canvases" agent skill from https://github.com/PostHog/posthog/tree/master/products/canvas/skills/building-html-canvases into .opencode/skills/building-html-canvases/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-html-canvases", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
building-html-canvases- GitHub stars
- 40k
- Token cost
- ~1.3k tokens
- SKILL.md length
- 633 words
- Files
- 1
- Skills in repo
- 252
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Author a PostHog canvas with semantic HTML, CSS, and direct browser APIs — documents, articles, generative graphics, 2D canvas and WebGL experiences, and focused experiments where React components…
- Tasks that involve 3D graphics and WebGL
- SKILL.md covers The wrapper the current…, Styling and theme without Quill and Rules that still apply
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve React components
What it does
Building HTML Canvases is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Author a PostHog canvas with semantic HTML, CSS, and direct browser APIs — documents, articles, generative graphics, 2D canvas and WebGL experiences, and focused experiments where React components add no useful structure. Use after building-canvases has routed a canvas request to a plain-HTML/browser-API implementation. Covers the thin component wrapper the current runtime requires, styling and theming without Quill, drawing surfaces, and animation/cleanup patterns.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Frontend & Design, covering 3D graphics and WebGL, React components and Theming and dark mode. It works with PostHog and React. The repository describes itself as: :hedgehog: PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error…
When your agent uses it
- Tasks that involve 3D graphics and WebGL
- Tasks that involve React components
- Tasks that involve Theming and dark mode
Example prompts
- “/building-html-canvases”
What it can do on your machine
Read from SKILL.md and the folder at commit 812e5c6. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Building HTML Canvases loads about 1.3k tokens when it runs. Until then it costs about 123 tokens; SKILL.md has 633 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 633 words (~1,275 tokens).
“Some canvases are documents or graphics programs, not applications: a written report, a diagram, a generative-art piece, a WebGL scene. For these, semantic HTML, CSS, and direct browser APIs are the right tools — don't force Quill components or React…”
- name
- building-html-canvases
Files
Just SKILL.md in products/canvas/skills/building-html-canvases of PostHog/posthog.
Open the folder on GitHubat commit 812e5c6
Used in 1 other repository
We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders. This page covers the copy in PostHog/posthog, which our catalogue first saw on October 8, 2026.
Compare with similar skills
Building HTML Canvases next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Building HTML Canvases this skillPostHog/posthog | 40k | — | ~1.3k | Automated safety check: Pass | Custom licence | |
| Shadcn Tailwind UILiarMTTT/TavernWeave | 153 | — | ~1.7k | Automated safety check: Pass | Custom licence | |
| Tailwind V4 Shadcnsecondsky/claude-skills | 227 | — | ~4k | Automated safety check: Pass | MIT | |
| Chakra UI v3 Builderchakra-ui/chakra-ui | 41k | — | ~3.1k | Automated safety check: Pass | MIT | |
| Taro UI Guidejd-opensource/taro-ui | 4.7k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Pierre Trees File Treepierrecomputer/pierre | 6.3k | — | ~473 | Automated safety check: Pass | Apache-2.0 |
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Categories
Questions about Building HTML Canvases
What does Building HTML Canvases do?
Author a PostHog canvas with semantic HTML, CSS, and direct browser APIs — documents, articles, generative graphics, 2D canvas and WebGL experiences, and focused experiments where React components…. Building HTML Canvases is an agent skill from PostHog/posthog, published by the product's own GitHub organization. Author a PostHog canvas with semantic HTML, CSS, and direct browser APIs — documents, articles, generative graphics, 2D canvas and WebGL experiences, and focused experiments where React components add no useful structure.
When should I use Building HTML Canvases?
Building HTML Canvases fits situations like: tasks that involve 3D graphics and WebGL; tasks that involve React components; tasks that involve Theming and dark mode.
How do I install Building HTML Canvases in Claude Code?
Run `npx skills add PostHog/posthog --skill building-html-canvases -a claude-code`. Or copy the skill folder (products/canvas/skills/building-html-canvases in PostHog/posthog) into .claude/skills/building-html-canvases in your project. Claude Code loads it when a task matches its description.
How do I install Building HTML Canvases in Codex?
Run `npx skills add PostHog/posthog --skill building-html-canvases -a codex`. Or copy the skill folder (products/canvas/skills/building-html-canvases in PostHog/posthog) into .agents/skills/building-html-canvases in your project. Codex loads it when a task matches its description.
Can I use Building HTML Canvases in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add PostHog/posthog --skill building-html-canvases -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/building-html-canvases, .gemini/skills/building-html-canvases, .github/skills/building-html-canvases and .opencode/skills/building-html-canvases in your project.
What does Building HTML Canvases need to run?
SKILL.md names no scripts, command-line tools or credentials: Building HTML Canvases is instructions for the agent only.
Does Building HTML Canvases access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Building HTML Canvases safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Building HTML Canvases use?
Building HTML Canvases has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Building HTML Canvases use?
About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Building HTML Canvases?
Skills that share tags, products or a category with Building HTML Canvases: Shadcn Tailwind UI (LiarMTTT/TavernWeave, 153 stars), Tailwind V4 Shadcn (secondsky/claude-skills, 227 stars), Chakra UI v3 Builder (chakra-ui/chakra-ui, 41k stars) and Taro UI Guide (jd-opensource/taro-ui, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Building HTML Canvases?
PostHog (a GitHub organization, an official publisher) maintains it in PostHog/posthog, which has 40,200 GitHub stars. The repository holds 252 skills in this directory. The repository was last updated on October 9, 2026.
Source: PostHog/posthog on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.