UI Styling
Ohh-889/skyroc
Create beautiful, accessible user interfaces with shadcn/ui components (built on Radix UI + Tailwind), Tailwind CSS utility-first styling, and canvas-based visual designs.
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope.
Install CSS Containment
$ npx skills add thedaviddias/Front-End-Checklist --skill css-containment -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-containment --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/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/css-containment .claude/skills/css-containment && 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 "css-containment" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-containment into .claude/skills/css-containment/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-containment", 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/thedaviddias/Front-End-Checklist/tree/main/skills/css-containmentType 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 thedaviddias/Front-End-Checklist --skill css-containment -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-containment --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/css-containment .agents/skills/css-containment && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "css-containment" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-containment into .agents/skills/css-containment/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-containment", 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 thedaviddias/Front-End-Checklist --skill css-containment -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-containment --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/css-containment .cursor/skills/css-containment && 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 "css-containment" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-containment into .cursor/skills/css-containment/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-containment", 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/thedaviddias/Front-End-Checklist.git --path skills/css-containment--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 thedaviddias/Front-End-Checklist --skill css-containment -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-containment --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/css-containment .gemini/skills/css-containment && 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 "css-containment" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-containment into .gemini/skills/css-containment/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-containment", 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 thedaviddias/Front-End-Checklist css-containmentInstalls 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 thedaviddias/Front-End-Checklist --skill css-containment -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/css-containment .github/skills/css-containment && 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 "css-containment" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-containment into .github/skills/css-containment/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-containment", 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 thedaviddias/Front-End-Checklist --skill css-containment -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-containment --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/thedaviddias/Front-End-Checklist.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/css-containment .opencode/skills/css-containment && 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 "css-containment" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-containment into .opencode/skills/css-containment/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-containment", 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
css-containment- GitHub stars
- 74k
- Token cost
- ~512 tokens
- SKILL.md length
- 208 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope.
- Reviewing stylesheets
- SKILL.md covers Quick Reference, Check, Fix and Explain, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Component styles
What it does
CSS Containment is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope. Check the rendered layout across breakpoints and interaction states before proposing a fix.
Its SKILL.md is about 510 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/rule.md`).
It sits in Frontend & Design, covering CSS and styling and Responsive design. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
When your agent uses it
- Reviewing stylesheets
- Component styles
- Responsive behavior related to Use CSS containment to limit repaint scope
Example prompts
- “/css-containment”
What it can do on your machine
Read from SKILL.md and the folder at commit e8d14d0. 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
Links to these hosts (documentation or services it may open):
frontendchecklist.io
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
CSS Containment loads about 512 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 59 tokens; SKILL.md has 208 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
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 208 words, ~512 tokens.
Download SKILL.mdSave it as
.claude/skills/css-containment/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- css-containment
- description
- Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope. Check the rendered layout across breakpoints and interaction states before proposing a fix.
- metadata.category
- css
- metadata.priority
- medium
- metadata.difficulty
- advanced
- metadata.estimatedTime
- 20
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/css/css-containment
Use CSS containment to limit repaint scope
By default, a CSS change anywhere on the page can potentially affect any other element's layout. CSS containment declares that certain elements are isolated — changes inside them don't affect the outside world. This lets browsers skip large portions of the rendering pipeline for unchanged content, which is especially valuable for pages with many independent components.
Quick Reference
- contain: layout style paint tells the browser a component is visually self-contained
- content-visibility: auto skips rendering off-screen content entirely
- Containment limits how far layout recalculations need to propagate
- Use contain: strict for widgets with no overflow that shouldn't affect the page
Check
Identify components in this CSS that are visually self-contained (no overflow, no interaction with elements outside) and could benefit from CSS containment.
Fix
Add appropriate contain values to self-contained components. Add content-visibility: auto to repeated off-screen list items.
Explain
Explain CSS containment values, how they limit rendering scope, and when content-visibility: auto provides the biggest benefit.
Code Review
Review stylesheets, component styles, and responsive states related to Use CSS containment to limit repaint scope. Flag exact selectors, declarations, or breakpoints that violate the rule in the rendered UI.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/css/css-containment
© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file (references) in skills/css-containment of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
CSS Containment 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 |
|---|---|---|---|---|---|---|
| CSS Containment this skillthedaviddias/Front-End-Checklist | 74k | — | ~512 | Automated safety check: Pass | MIT | |
| UI StylingOhh-889/skyroc | 795 | 13 repos | ~2.5k | Automated safety check: Pass | MIT | |
| Frontend Design Routercode-yeongyu/oh-my-openagent | 70k | — | ~5.3k | Automated safety check: Pass | Custom licence | |
| Refero Designreferodesign/refero_skill | 295 | — | ~5.3k | Automated safety check: Pass | MIT | |
| Tailwind CSS Patternsever-works/ever-works | 158 | 3 repos | ~1.6k | Automated safety check: Notes | AGPL-3.0 | |
| Good CSSvojtaholik/good-css | 120 | — | ~1.2k | Automated safety check: Pass | MIT |
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Related
Categories
Questions about CSS Containment
What does CSS Containment do?
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope. CSS Containment is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS containment to limit repaint scope.
When should I use CSS Containment?
CSS Containment fits situations like: reviewing stylesheets; component styles; responsive behavior related to Use CSS containment to limit repaint scope.
How do I install CSS Containment in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill css-containment -a claude-code`. Or copy the skill folder (skills/css-containment in thedaviddias/Front-End-Checklist) into .claude/skills/css-containment in your project. Claude Code loads it when a task matches its description.
How do I install CSS Containment in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill css-containment -a codex`. Or copy the skill folder (skills/css-containment in thedaviddias/Front-End-Checklist) into .agents/skills/css-containment in your project. Codex loads it when a task matches its description.
Can I use CSS Containment 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 thedaviddias/Front-End-Checklist --skill css-containment -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/css-containment, .gemini/skills/css-containment, .github/skills/css-containment and .opencode/skills/css-containment in your project.
What does CSS Containment need to run?
SKILL.md names no scripts, command-line tools or credentials: CSS Containment is instructions for the agent only.
Does CSS Containment access the network?
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
Is CSS Containment 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 CSS Containment use?
CSS Containment is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does CSS Containment use?
About 512 tokens (SKILL.md is roughly 2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 957 tokens, read only when the agent opens those files.
What are the alternatives to CSS Containment?
Skills that share tags, products or a category with CSS Containment: UI Styling (Ohh-889/skyroc, 795 stars), Frontend Design Router (code-yeongyu/oh-my-openagent, 70k stars), Refero Design (referodesign/refero_skill, 295 stars) and Tailwind CSS Patterns (ever-works/ever-works, 158 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains CSS Containment?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,398 GitHub stars. The repository holds 390 skills in this directory. The repository was last updated on October 6, 2026.
Source: thedaviddias/Front-End-Checklist on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.