Web Interface Guidelines Reviewer
vercel-labs/openreview
Review UI code for Web Interface Guidelines compliance. Use when asked to "review my UI", "check accessibility", "audit design", "review UX", or "check my…
A skill your agent uses when applies to all visible text and text images, UI component borders (input fields, buttons), focus indicators, icons that convey meaning, and graphical objects required to…
Install Color Contrast
$ npx skills add thedaviddias/Front-End-Checklist --skill color-contrast -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist color-contrast --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/color-contrast .claude/skills/color-contrast && 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 "color-contrast" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/color-contrast into .claude/skills/color-contrast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-contrast", 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/color-contrastType 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 color-contrast -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist color-contrast --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/color-contrast .agents/skills/color-contrast && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "color-contrast" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/color-contrast into .agents/skills/color-contrast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-contrast", 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 color-contrast -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist color-contrast --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/color-contrast .cursor/skills/color-contrast && 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 "color-contrast" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/color-contrast into .cursor/skills/color-contrast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-contrast", 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/color-contrast--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 color-contrast -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist color-contrast --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/color-contrast .gemini/skills/color-contrast && 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 "color-contrast" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/color-contrast into .gemini/skills/color-contrast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-contrast", 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 color-contrastInstalls 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 color-contrast -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/color-contrast .github/skills/color-contrast && 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 "color-contrast" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/color-contrast into .github/skills/color-contrast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-contrast", 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 color-contrast -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 color-contrast --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/color-contrast .opencode/skills/color-contrast && 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 "color-contrast" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/color-contrast into .opencode/skills/color-contrast/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-contrast", 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
color-contrast- GitHub stars
- 74k
- Token cost
- ~851 tokens
- SKILL.md length
- 438 words
- Files
- 2 (incl. references)
- Skills in repo
- 390
- Repo updated
- First seen
- Licence
- MIT
At a glance
A skill your agent uses when applies to all visible text and text images, UI component borders (input fields, buttons), focus indicators, icons that convey meaning, and graphical objects required to…
- Applies to all visible text and text images
- 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
- UI component borders (input fields
What it does
Color Contrast is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to all visible text and text images, UI component borders (input fields, buttons), focus indicators, icons that convey meaning, and graphical objects required to understand content. Does not apply to inactive/disabled UI components or purely decorative elements.
Its SKILL.md is about 850 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. 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
- Applies to all visible text and text images
- UI component borders (input fields
- Focus indicators
- Icons that convey meaning
Example prompts
- “/color-contrast”
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
Color Contrast loads about 851 tokens when it runs, and up to ~1.9k if it reads all its reference files. Until then it costs about 74 tokens; SKILL.md has 438 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). 438 words, ~851 tokens.
Download SKILL.mdSave it as
.claude/skills/color-contrast/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- color-contrast
- description
- Use when applies to all visible text and text images, UI component borders (input fields, buttons), focus indicators, icons that convey meaning, and graphical objects required to understand content. Does not apply to inactive/disabled UI components or purely decorative elements.
- metadata.category
- accessibility
- metadata.priority
- high
- metadata.difficulty
- intermediate
- metadata.estimatedTime
- 15
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/accessibility/color-contrast
Meet minimum color contrast ratios
Approximately 1 in 12 men and 1 in 200 women have some form of color vision deficiency. Low contrast text is also difficult for users with low vision, aging eyesight, or those reading in bright sunlight. Insufficient contrast is one of the most common WCAG failures and directly prevents users from reading content they need.
Quick Reference
- Normal text (< 18pt or < 14pt bold): minimum contrast ratio of 4.5:1 — WCAG 2.1 SC 1.4.3 Level AA
- Large text (≥ 18pt / 24px, or ≥ 14pt bold / ~18.67px bold): minimum 3:1 contrast ratio
- Non-text UI components (icons, focus indicators, input borders): minimum 3:1 against adjacent color — WCAG 2.1 SC 1.4.11 Level AA
- WCAG 2.1 SC 1.4.6 (Level AAA) requires 7:1 for normal text and 4.5:1 for large text
- Decorative text and logotypes are exempt from contrast requirements
Check
Evaluate the contrast ratio between text color and its background for all text on the page. Use the WCAG relative luminance formula: for normal text (< 18pt or < 14pt bold), the ratio must be ≥ 4.5:1; for large text (≥ 18pt or ≥ 14pt bold), the ratio must be ≥ 3:1. Also check non-text UI components (input borders, button outlines, icons) for ≥ 3:1 ratio against adjacent colors per WCAG 2.1 SC 1.4.11. Check all interactive states: default, hover, focus, active, and visited.
Fix
Darken the foreground color or lighten/darken the background color until the ratio meets the minimum. For normal text failing 4.5:1: increase text darkness or background lightness. For large text failing 3:1: apply same approach with a lower threshold. Use a contrast checker tool (WebAIM, browser DevTools accessibility panel) to verify the exact ratio. Do not use opacity to lighten text — compute the effective blended color and check that ratio instead.
Show full SKILL.md (153 more words)Show less
Explain
WCAG 2.1 SC 1.4.3 (Contrast Minimum, Level AA) requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (≥ 18pt regular or ≥ 14pt bold). Contrast ratio is calculated from the relative luminance of the foreground and background colors using the formula (L1 + 0.05) / (L2 + 0.05), where L1 is the lighter and L2 is the darker color. A ratio of 1:1 means no contrast (same color); 21:1 is maximum (black on white). Users with low vision, cataracts, or color blindness rely on high contrast to distinguish text from its background.
Code Review
Review the rendered markup and interactive states that affect Meet minimum color contrast ratios. 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/color-contrast
© 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/color-contrast of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Color Contrast 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 |
|---|---|---|---|---|---|---|
| Color Contrast this skillthedaviddias/Front-End-Checklist | 74k | — | ~851 | Automated safety check: Pass | MIT | |
| Web Interface Guidelines Reviewervercel-labs/openreview | 1.7k | 97 repos | ~308 | Automated safety check: Pass | None | |
| Accessibility Reviewmarkmead/hyperui | 12k | 1 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Web Animation DesignbaptisteArno/typebot.io | 11k | 2 repos | ~2.7k | Automated safety check: Pass | Custom licence | |
| Accessibility Fixeribelick/ui-skills | 9.6k | 4 repos | ~1.2k | Automated safety check: Pass | MIT | |
| Wcag Audit PatternsvmDeshpande/ai-agent-automation | 178 | 11 repos | ~610 | Automated safety check: Pass | Apache-2.0 |
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Audits and fixes HTML accessibility problems such as ARIA labels, keyboard navigation, focus management, contrast and form errors with minimal changes.
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Related
Categories
Questions about Color Contrast
What does Color Contrast do?
A skill your agent uses when applies to all visible text and text images, UI component borders (input fields, buttons), focus indicators, icons that convey meaning, and graphical objects required to…. Color Contrast is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to all visible text and text images, UI component borders (input fields, buttons), focus indicators, icons that convey meaning, and graphical objects required to understand content.
When should I use Color Contrast?
Color Contrast fits situations like: applies to all visible text and text images; UI component borders (input fields; focus indicators; icons that convey meaning.
How do I install Color Contrast in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill color-contrast -a claude-code`. Or copy the skill folder (skills/color-contrast in thedaviddias/Front-End-Checklist) into .claude/skills/color-contrast in your project. Claude Code loads it when a task matches its description.
How do I install Color Contrast in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill color-contrast -a codex`. Or copy the skill folder (skills/color-contrast in thedaviddias/Front-End-Checklist) into .agents/skills/color-contrast in your project. Codex loads it when a task matches its description.
Can I use Color Contrast 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 color-contrast -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/color-contrast, .gemini/skills/color-contrast, .github/skills/color-contrast and .opencode/skills/color-contrast in your project.
What does Color Contrast need to run?
SKILL.md names no scripts, command-line tools or credentials: Color Contrast is instructions for the agent only.
Does Color Contrast 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 Color Contrast 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 Color Contrast use?
Color Contrast 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 Color Contrast use?
About 851 tokens (SKILL.md is roughly 3.4k 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 1k tokens, read only when the agent opens those files.
What are the alternatives to Color Contrast?
Skills that share tags, products or a category with Color Contrast: Web Interface Guidelines Reviewer (vercel-labs/openreview, 1.7k stars), Accessibility Review (markmead/hyperui, 12k stars), Web Animation Design (baptisteArno/typebot.io, 11k stars) and Accessibility Fixer (ibelick/ui-skills, 9.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Color Contrast?
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.