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A skill your agent uses when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may…
Install Has Selector
$ npx skills add thedaviddias/Front-End-Checklist --skill has-selector -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist has-selector --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/has-selector .claude/skills/has-selector && 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 "has-selector" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/has-selector into .claude/skills/has-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "has-selector", 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/has-selectorType 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 has-selector -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist has-selector --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/has-selector .agents/skills/has-selector && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "has-selector" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/has-selector into .agents/skills/has-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "has-selector", 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 has-selector -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist has-selector --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/has-selector .cursor/skills/has-selector && 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 "has-selector" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/has-selector into .cursor/skills/has-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "has-selector", 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/has-selector--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 has-selector -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist has-selector --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/has-selector .gemini/skills/has-selector && 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 "has-selector" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/has-selector into .gemini/skills/has-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "has-selector", 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 has-selectorInstalls 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 has-selector -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/has-selector .github/skills/has-selector && 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 "has-selector" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/has-selector into .github/skills/has-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "has-selector", 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 has-selector -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 has-selector --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/has-selector .opencode/skills/has-selector && 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 "has-selector" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/has-selector into .opencode/skills/has-selector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "has-selector", 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
has-selector- GitHub stars
- 74k
- Token cost
- ~547 tokens
- SKILL.md length
- 250 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 or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may…
- 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
- Components that use JavaScript to toggle classes on parent elements based on child state
What it does
Has Selector is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may replace the JavaScript entirely.
Its SKILL.md is about 550 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. It works with JavaScript. 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
- Components that use JavaScript to toggle classes on parent elements based on child state
- Form input values
- Content presence — :has() may replace the JavaScript entirely
Example prompts
- “/has-selector”
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
Has Selector loads about 547 tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 55 tokens; SKILL.md has 250 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). 250 words, ~547 tokens.
Download SKILL.mdSave it as
.claude/skills/has-selector/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- has-selector
- description
- Use when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may replace the JavaScript entirely.
- metadata.category
- css
- metadata.priority
- low
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 20
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/css/has-selector
Use :has() to style parent elements based on their descendants
Before :has(), styling a parent based on its children required JavaScript: detecting state, toggling classes, and keeping DOM and styles in sync. This created coupling between styling logic and application logic. :has() moves that relationship back into CSS where it belongs, reducing JavaScript complexity, eliminating class-toggling boilerplate, and making styling intent readable in the stylesheet itself.
Quick Reference
- :has() selects an element when a matching descendant exists inside it
- It is the parent selector CSS has needed for decades
- Baseline support since late 2023 — all major browsers include it
- Avoid complex :has() selectors in hot reflow paths — they can affect layout performance
Check
Look for patterns in this code where JavaScript toggles a class on a parent element based on the state or content of a child element. These are candidates for replacement with :has().
Fix
Replace the JavaScript class-toggling logic with a CSS :has() selector. Show the selector that targets the parent element when the relevant child condition is met.
Explain
Explain how the :has() pseudo-class works, how it differs from :is() and :not(), what descendant vs child combinators mean inside :has(), and how browser support stands today.
Code Review
Review the stylesheets and component JavaScript in this file. Flag any locations where a parent element's style is controlled by toggling a class from JavaScript based on child state — and show the equivalent :has() rule.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/css/has-selector
© 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/has-selector of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Has Selector 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 |
|---|---|---|---|---|---|---|
| Has Selector this skillthedaviddias/Front-End-Checklist | 74k | — | ~547 | Automated safety check: Pass | MIT | |
| Tailwindcss Developmentanonaddy/anonaddy | 4.9k | 10 repos | ~865 | Automated safety check: Pass | MIT | |
| Language Supportlive-codes/livecodes | 1.5k | — | ~1.6k | Automated safety check: Pass | MIT | |
| Frontend Design Principlespretend1111/claude-desktop-app | 496 | 1 repos | ~824 | Automated safety check: Pass | Custom licence | |
| Liquid Theme Standardsbenjaminsehl/liquid-skills | 120 | — | ~3k | Automated safety check: Pass | None | |
| Using Ouds Web Version Major MinorOrange-OpenSource/Orange-Boosted-Bootstrap | 222 | — | ~4.2k | Automated safety check: Pass | MIT |
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Related
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Categories
Questions about Has Selector
What does Has Selector do?
A skill your agent uses when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may…. Has Selector is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing stylesheets or components that use JavaScript to toggle classes on parent elements based on child state, form input values, or content presence — :has() may replace the JavaScript entirely.
When should I use Has Selector?
Has Selector fits situations like: reviewing stylesheets; components that use JavaScript to toggle classes on parent elements based on child state; form input values; content presence — :has() may replace the JavaScript entirely.
How do I install Has Selector in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill has-selector -a claude-code`. Or copy the skill folder (skills/has-selector in thedaviddias/Front-End-Checklist) into .claude/skills/has-selector in your project. Claude Code loads it when a task matches its description.
How do I install Has Selector in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill has-selector -a codex`. Or copy the skill folder (skills/has-selector in thedaviddias/Front-End-Checklist) into .agents/skills/has-selector in your project. Codex loads it when a task matches its description.
Can I use Has Selector 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 has-selector -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/has-selector, .gemini/skills/has-selector, .github/skills/has-selector and .opencode/skills/has-selector in your project.
What does Has Selector need to run?
SKILL.md names no scripts, command-line tools or credentials: Has Selector is instructions for the agent only.
Does Has Selector 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 Has Selector 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 Has Selector use?
Has Selector 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 Has Selector use?
About 547 tokens (SKILL.md is roughly 2.2k 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 1.5k tokens, read only when the agent opens those files.
What are the alternatives to Has Selector?
Skills that share tags, products or a category with Has Selector: Tailwindcss Development (anonaddy/anonaddy, 4.9k stars), Language Support (live-codes/livecodes, 1.5k stars), Frontend Design Principles (pretend1111/claude-desktop-app, 496 stars) and Liquid Theme Standards (benjaminsehl/liquid-skills, 120 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Has Selector?
thedaviddias (a GitHub user) maintains it in thedaviddias/Front-End-Checklist, which has 74,421 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.