A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS custom properties for design tokens.
$ npx skills add thedaviddias/Front-End-Checklist --skill css-custom-properties -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-custom-properties --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-custom-properties .claude/skills/css-custom-properties && 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-custom-properties" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-custom-properties into .claude/skills/css-custom-properties/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-custom-properties", 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-custom-propertiesType 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-custom-properties -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-custom-properties --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-custom-properties .agents/skills/css-custom-properties && 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-custom-properties" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-custom-properties into .agents/skills/css-custom-properties/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-custom-properties", 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-custom-properties -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-custom-properties --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-custom-properties .cursor/skills/css-custom-properties && 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-custom-properties" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-custom-properties into .cursor/skills/css-custom-properties/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-custom-properties", 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-custom-properties--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-custom-properties -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist css-custom-properties --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-custom-properties .gemini/skills/css-custom-properties && 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-custom-properties" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-custom-properties into .gemini/skills/css-custom-properties/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-custom-properties", 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-custom-propertiesInstalls 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-custom-properties -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-custom-properties .github/skills/css-custom-properties && 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-custom-properties" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-custom-properties into .github/skills/css-custom-properties/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-custom-properties", 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-custom-properties -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-custom-properties --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-custom-properties .opencode/skills/css-custom-properties && 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-custom-properties" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/css-custom-properties into .opencode/skills/css-custom-properties/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "css-custom-properties", 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.
css-custom-propertiesA skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS custom properties for design tokens.
CSS Custom Properties is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS custom properties for design tokens. Check the rendered layout across breakpoints and interaction states before proposing a fix.
Its SKILL.md is about 490 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, Design tokens and Responsive design. The repository describes itself as: 🗂 The essential checklist for modern web development, for humans and AI agents. The licence is MIT.
Read from SKILL.md and the folder at commit e8d14d0. It shows what the files ask for, not the result of running them.
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.
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.
Links to these hosts (documentation or services it may open):
frontendchecklist.ioFrom URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
CSS Custom Properties loads about 492 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 61 tokens; SKILL.md has 203 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.
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.
The full file from thedaviddias/Front-End-Checklist at commit e8d14d0, republished under its MIT licence (© thedaviddias). 203 words, ~492 tokens.
.claude/skills/css-custom-properties/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.Hard-coded color values and magic numbers scattered across CSS files make global changes (a rebrand, a dark mode, a spacing adjustment) require finding and updating dozens of individual lines. Custom properties centralize these values so one change propagates everywhere — and enable runtime theming that preprocessor variables cannot.
Find hard-coded color values, spacing values, and font sizes in this CSS file that should be replaced with CSS custom properties.
Extract repeated and meaningful values into CSS custom properties on :root and replace all usages with var() references.
Explain CSS custom properties: how they differ from preprocessor variables, how cascade and inheritance work, and how to use them for theming.
Review stylesheets, component styles, and responsive states related to Use CSS custom properties for design tokens. 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-custom-properties
© thedaviddias, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
SKILL.md and 1 other file (references) in skills/css-custom-properties of thedaviddias/Front-End-Checklist.
Open the folder on GitHubat commit e8d14d0
CSS Custom Properties 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 Custom Properties this skillthedaviddias/Front-End-Checklist | 74k | — | ~492 | Automated safety check: Pass | MIT | |
| Using Ouds Web Version Major MinorOrange-OpenSource/Orange-Boosted-Bootstrap | 222 | — | ~4.2k | Automated safety check: Pass | MIT | |
| Bootstrap ReferenceBlueAndi/Pixelix | 443 | — | ~2k | Automated safety check: Pass | MIT | |
| Shadcn Tailwind UILiarMTTT/TavernWeave | 153 | — | ~1.7k | Automated safety check: Pass | Custom licence | |
| Tailwind PatternsxenitV1/Antigravity-Workflows | 130 | 7 repos | ~1.7k | Automated safety check: Pass | MIT | |
| Tailwind ShadcnBlackBeltTechnology/pi-agent-dashboard | 315 | — | ~1.2k | Automated safety check: Pass | MIT |
Orange-OpenSource/Orange-Boosted-Bootstrap
Provides comprehensive knowledge of the OUDS Web library (Orange Unified Design System for Web), a Bootstrap-based CSS/JS framework for building Orange-branded web interfaces.
BlueAndi/Pixelix
A skill your agent uses when building or reviewing UI with Bootstrap 5.3 — setting up the CDN/npm, using the grid & breakpoints, utility classes (spacing/color/flex/display), components (navbar…
LiarMTTT/TavernWeave
Build, restyle, or review accessible React interfaces that use shadcn/ui, Radix UI primitives, and Tailwind CSS.
xenitV1/Antigravity-Workflows
Tailwind CSS v4 principles. An agent skill from xenitV1/Antigravity-Workflows.
BlackBeltTechnology/pi-agent-dashboard
Tailwind CSS utility patterns with shadcn/ui component usage, theming via CSS variables, and responsive design.
coco-research/coco
Tailwind CSS v4 principles. An agent skill from coco-research/coco.
thedaviddias/Front-End-Checklist
Audits article and blog pages for visible publish dates, Article JSON-LD with datePublished and dateModified, and Open Graph time tags, then fixes what is missing.
thedaviddias/Front-End-Checklist
Adds, checks and fixes FAQPage JSON-LD on pages with visible question-and-answer sections so it matches what readers see and can qualify for rich results.
thedaviddias/Front-End-Checklist
Checks that a site's favicon is linked, reachable and large enough for Google search results, and sets up ICO, SVG and Apple touch icon files when they are missing.
thedaviddias/Front-End-Checklist
Audits article pages for freshness signals, covering the Last-Modified header, Article JSON-LD dateModified and a visible last-updated date, and fixes mismatches.
thedaviddias/Front-End-Checklist
Audits and fixes geo.region, geo.placename and geo.position meta tags on regional pages, noting where they help (Bing) and where they do not (Google).
thedaviddias/Front-End-Checklist
Scores and rewrites a Front-End Checklist rule MDX file against a scored quality rubric, replacing generic stub prompts with specific, actionable ones.
Categories
A skill your agent uses when reviewing stylesheets, component styles, and responsive behavior related to Use CSS custom properties for design tokens. CSS Custom Properties is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets, component styles, and responsive behavior related to Use CSS custom properties for design tokens.
CSS Custom Properties fits situations like: reviewing stylesheets; component styles; responsive behavior related to Use CSS custom properties for design tokens.
Run `npx skills add thedaviddias/Front-End-Checklist --skill css-custom-properties -a claude-code`. Or copy the skill folder (skills/css-custom-properties in thedaviddias/Front-End-Checklist) into .claude/skills/css-custom-properties in your project. Claude Code loads it when a task matches its description.
Run `npx skills add thedaviddias/Front-End-Checklist --skill css-custom-properties -a codex`. Or copy the skill folder (skills/css-custom-properties in thedaviddias/Front-End-Checklist) into .agents/skills/css-custom-properties in your project. Codex loads it when a task matches its description.
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-custom-properties -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-custom-properties, .gemini/skills/css-custom-properties, .github/skills/css-custom-properties and .opencode/skills/css-custom-properties in your project.
SKILL.md names no scripts, command-line tools or credentials: CSS Custom Properties is instructions for the agent only.
SKILL.md names 1 domain. As links in the text: frontendchecklist.io. This is read from the text; nothing was executed.
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.
CSS Custom Properties is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
About 492 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 826 tokens, read only when the agent opens those files.
Skills that share tags, products or a category with CSS Custom Properties: Using Ouds Web Version Major Minor (Orange-OpenSource/Orange-Boosted-Bootstrap, 222 stars), Bootstrap Reference (BlueAndi/Pixelix, 443 stars), Shadcn Tailwind UI (LiarMTTT/TavernWeave, 153 stars) and Tailwind Patterns (xenitV1/Antigravity-Workflows, 130 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,412 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.
