UI/UX Design System Advisor
Galaxy-Dawn/claude-scholar
Turns a vague UI request into a concrete design system with style, palette, typography and layout guidance from a search script, plus stack-specific implementation advice.
A skill your agent uses when reviewing rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content.
Install Flashing Content
$ npx skills add thedaviddias/Front-End-Checklist --skill flashing-content -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist flashing-content --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/flashing-content .claude/skills/flashing-content && 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 "flashing-content" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/flashing-content into .claude/skills/flashing-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flashing-content", 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/flashing-contentType 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 flashing-content -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist flashing-content --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/flashing-content .agents/skills/flashing-content && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "flashing-content" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/flashing-content into .agents/skills/flashing-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flashing-content", 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 flashing-content -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist flashing-content --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/flashing-content .cursor/skills/flashing-content && 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 "flashing-content" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/flashing-content into .cursor/skills/flashing-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flashing-content", 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/flashing-content--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 flashing-content -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist flashing-content --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/flashing-content .gemini/skills/flashing-content && 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 "flashing-content" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/flashing-content into .gemini/skills/flashing-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flashing-content", 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 flashing-contentInstalls 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 flashing-content -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/flashing-content .github/skills/flashing-content && 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 "flashing-content" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/flashing-content into .github/skills/flashing-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flashing-content", 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 flashing-content -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 flashing-content --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/flashing-content .opencode/skills/flashing-content && 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 "flashing-content" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/flashing-content into .opencode/skills/flashing-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "flashing-content", 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
flashing-content- GitHub stars
- 74k
- Token cost
- ~530 tokens
- SKILL.md length
- 214 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 rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content.
- Reviewing rendered HTML
- 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
- Interactive components
What it does
Flashing Content is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
Its SKILL.md is about 530 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 Accessibility and Design systems. 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 rendered HTML
- Interactive components
- Design-system patterns related to Prevent seizure-triggering flashing content
Example prompts
- “/flashing-content”
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
Flashing Content loads about 530 tokens when it runs, and up to ~2.1k if it reads all its reference files. Until then it costs about 72 tokens; SKILL.md has 214 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). 214 words, ~530 tokens.
Download SKILL.mdSave it as
.claude/skills/flashing-content/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- flashing-content
- description
- Use when reviewing rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content. Check native semantics first, then inspect keyboard behavior, focus flow, accessible names, and screen-reader output where relevant.
- metadata.category
- accessibility
- metadata.priority
- critical
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 15
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/accessibility/flashing-content
Prevent seizure-triggering flashing content
Flashing content between 3-60 Hz can trigger seizures in people with photosensitive epilepsy—this is a critical safety requirement, not just an accessibility preference.
Quick Reference
- Never flash content more than 3 times per second (WCAG Level A)
- Flashing area must be smaller than 25% of viewport
- Red flashing is especially dangerous—avoid entirely
- Test GIFs, videos, and CSS animations for rapid flashing
Check
Verify no content flashes more than 3 times per second, and that any flashing content occupies less than 25% of the viewport. Test animated GIFs, videos, and CSS animations for rapid flashing patterns.
Fix
Remove or slow down rapid flashing animations. Use animation tools to measure flash frequency. Replace flashing effects with fade transitions or static alternatives that convey the same information.
Explain
Explain how flashing content between 3-60 Hz can trigger seizures in people with photosensitive epilepsy, and why this is a critical accessibility and safety requirement under WCAG 2.3.1.
Code Review
Review the rendered markup and interactive states that affect Prevent seizure-triggering flashing content. Flag exact elements, roles, labels, focus behavior, or keyboard interactions that violate the rule, and note how to verify the fix with browser accessibility tooling or assistive tech.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/accessibility/flashing-content
© 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/flashing-content of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Flashing Content 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 |
|---|---|---|---|---|---|---|
| Flashing Content this skillthedaviddias/Front-End-Checklist | 74k | — | ~530 | Automated safety check: Pass | MIT | |
| UI/UX Design System AdvisorGalaxy-Dawn/claude-scholar | 5.7k | 1 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Extract DesignManavarya09/design-extract | 4.2k | — | ~786 | Automated safety check: Notes | MIT | |
| Color Auditrome-os/rome | 748 | — | ~2.7k | Automated safety check: Pass | MIT | |
| Material Design 3 UI/UX Guideskydashnet/material-design-3-ui-skill | 138 | — | ~3k | Automated safety check: Pass | MIT | |
| UI Component Spec Designerplugin87/ux-ui-agent-skills | 1.6k | — | ~2.8k | Automated safety check: Pass | MIT |
Similar skills
Extract Design
Manavarya09/design-extract
Extract the full design language from any website URL. An agent skill from Manavarya09/design-extract.
Color Audit
rome-os/rome
Audit a design system's color palette against measurable color-science disciplines — WCAG/APCA contrast of declared token pairs, perceptual (OKLCH) ramp uniformity, color-blindness safety of…
Material Design 3 UI/UX Guide
skydashnet/material-design-3-ui-skill
Guides designing, reviewing or implementing interfaces that follow Google's Material Design 3 system: semantic tokens, component states, adaptive layout and accessibility.
UI Component Spec Designer
plugin87/ux-ui-agent-skills
Writes a complete UI component spec with anatomy, variants, sizes, eight interaction states, design-token mapping and accessibility notes before or alongside code.
Typeui Fundamentals
bergside/typeui
Universal UI/UX design principles covering visual hierarchy, interaction laws, typography foundations, and WCAG accessibility requirements.
More from thedaviddias/Front-End-Checklist
All 390 skills in this repoContent Dates Audit
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.
FAQPage Schema Markup
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.
Favicon Audit and Setup
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.
Content Freshness Signals
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.
Geo Meta Tags Audit
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).
Improve a Front-End Checklist Rule
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.
Related
Categories
Questions about Flashing Content
What does Flashing Content do?
A skill your agent uses when reviewing rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content. Flashing Content is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing rendered HTML, interactive components, or design-system patterns related to Prevent seizure-triggering flashing content.
When should I use Flashing Content?
Flashing Content fits situations like: reviewing rendered HTML; interactive components; design-system patterns related to Prevent seizure-triggering flashing content.
How do I install Flashing Content in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill flashing-content -a claude-code`. Or copy the skill folder (skills/flashing-content in thedaviddias/Front-End-Checklist) into .claude/skills/flashing-content in your project. Claude Code loads it when a task matches its description.
How do I install Flashing Content in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill flashing-content -a codex`. Or copy the skill folder (skills/flashing-content in thedaviddias/Front-End-Checklist) into .agents/skills/flashing-content in your project. Codex loads it when a task matches its description.
Can I use Flashing Content 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 flashing-content -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/flashing-content, .gemini/skills/flashing-content, .github/skills/flashing-content and .opencode/skills/flashing-content in your project.
What does Flashing Content need to run?
SKILL.md names no scripts, command-line tools or credentials: Flashing Content is instructions for the agent only.
Does Flashing Content 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 Flashing Content 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 Flashing Content use?
Flashing Content 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 Flashing Content use?
About 530 tokens (SKILL.md is roughly 2.1k 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 Flashing Content?
Skills that share tags, products or a category with Flashing Content: UI/UX Design System Advisor (Galaxy-Dawn/claude-scholar, 5.7k stars), Extract Design (Manavarya09/design-extract, 4.2k stars), Color Audit (rome-os/rome, 748 stars) and Material Design 3 UI/UX Guide (skydashnet/material-design-3-ui-skill, 138 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Flashing Content?
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.