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 HTML documents. An agent skill from thedaviddias/Front-End-Checklist.
Install Lang Attribute
$ npx skills add thedaviddias/Front-End-Checklist --skill lang-attribute -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist lang-attribute --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/lang-attribute .claude/skills/lang-attribute && 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 "lang-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/lang-attribute into .claude/skills/lang-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "lang-attribute", 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/lang-attributeType 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 lang-attribute -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist lang-attribute --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/lang-attribute .agents/skills/lang-attribute && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "lang-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/lang-attribute into .agents/skills/lang-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "lang-attribute", 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 lang-attribute -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist lang-attribute --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/lang-attribute .cursor/skills/lang-attribute && 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 "lang-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/lang-attribute into .cursor/skills/lang-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "lang-attribute", 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/lang-attribute--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 lang-attribute -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist lang-attribute --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/lang-attribute .gemini/skills/lang-attribute && 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 "lang-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/lang-attribute into .gemini/skills/lang-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "lang-attribute", 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 lang-attributeInstalls 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 lang-attribute -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/lang-attribute .github/skills/lang-attribute && 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 "lang-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/lang-attribute into .github/skills/lang-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "lang-attribute", 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 lang-attribute -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 lang-attribute --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/lang-attribute .opencode/skills/lang-attribute && 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 "lang-attribute" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/lang-attribute into .opencode/skills/lang-attribute/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "lang-attribute", 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
lang-attribute- GitHub stars
- 74k
- Token cost
- ~995 tokens
- SKILL.md length
- 468 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 HTML documents. An agent skill from thedaviddias/Front-End-Checklist.
- Applies to all HTML documents
- 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
- Tasks that involve Accessibility
What it does
Lang Attribute is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to all HTML documents. Check the <html opening tag for a lang attribute with a non-empty, valid BCP 47 language code. Also check for lang attribute changes on individual elements when the document contains content in multiple languages (inline quotes, foreign terms, multilingual sections). The lang attribute is inherited — child elements inherit the language from their nearest ancestor with lang.
Its SKILL.md is about 1000 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 HTML documents
- Tasks that involve Accessibility
Example prompts
- “/lang-attribute”
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
Lang Attribute loads about 995 tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 111 tokens; SKILL.md has 468 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). 468 words, ~995 tokens.
Download SKILL.mdSave it as
.claude/skills/lang-attribute/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- lang-attribute
- description
- Use when applies to all HTML documents. Check the `<html>` opening tag for a `lang` attribute with a non-empty, valid BCP 47 language code. Also check for `lang` attribute changes on individual elements when the document contains content in multiple languages (inline quotes, foreign terms, multilingual sections). The `lang` attribute is inherited — child elements inherit the language from their nearest ancestor with `lang`.
- metadata.category
- html
- metadata.priority
- high
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 5
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/html/lang-attribute
Set the page lang attribute
Screen readers select the correct text-to-speech voice and pronunciation engine based on the lang attribute. Without it, VoiceOver defaults to the user's system language, and NVDA uses its default voice — both may mispronounce words in other languages, making content unintelligible. French text read with an English voice profile is incomprehensible. The lang attribute also enables browser translation features (Chrome's Translate), hyphenation algorithms (CSS hyphens: auto), and correct spell checking. This is a WCAG Level A requirement — the most fundamental accessibility baseline.
Quick Reference
- The
<html>element must have alangattribute — WCAG 2.1 SC 3.1.1 (Language of Page, Level A) - The value must be a valid BCP 47 language tag:
en,en-US,fr,zh-Hant,ar, etc. - Use
langon individual elements to indicate language changes within the page — WCAG 2.1 SC 3.1.2 (Level AA) - The
langattribute affects screen reader pronunciation, spell checking, hyphenation, and browser translation - An empty
lang=''is treated as unknown language — equivalent to having nolangattribute
Check
Inspect the <html> element in the page source. Verify: (1) a lang attribute is present; (2) its value is non-empty; (3) its value is a valid BCP 47 language code matching the primary language of the page content (e.g., en for English, fr for French, zh-Hant for Traditional Chinese). Flag: missing lang, empty lang='', language codes using full names instead of codes (e.g., lang='english' is invalid), and mismatches where the declared language does not match the actual content language. For multilingual pages, also check for lang changes on block-level elements containing content in a different language.
Show full SKILL.md (205 more words)Show less
Fix
Add or correct the lang attribute on the <html> element: <html lang='en'> for English, <html lang='fr'> for French, <html lang='es'> for Spanish, <html lang='de'> for German, <html lang='ja'> for Japanese, <html lang='zh-Hans'> for Simplified Chinese, <html lang='zh-Hant'> for Traditional Chinese, <html lang='ar'> for Arabic. For content sections in different languages, add lang to the containing block element. Validate language codes against the IANA Language Subtag Registry.
Explain
WCAG 2.1 SC 3.1.1 (Language of Page, Level A) requires that the default human language of each web page can be programmatically determined. The lang attribute on <html> fulfills this requirement. The value must be a BCP 47 language tag — a standardized system of subtags that identifies language, script, and region. The primary language subtag (e.g., en, fr) is required; region subtags (e.g., en-US, fr-CA) are optional but useful for dialect-specific pronunciation and spell checking. SC 3.1.2 (Language of Parts, Level AA) extends this to inline language changes within a page.
Code Review
Review templates, server-rendered HTML, and shared components that output markup related to Set the page lang attribute. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/html/lang-attribute
© 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/lang-attribute of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Lang Attribute 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 |
|---|---|---|---|---|---|---|
| Lang Attribute this skillthedaviddias/Front-End-Checklist | 74k | — | ~995 | 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 | 9.5k | 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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- Official
Accessibility Review
markmead/hyperui
Run a WCAG 2.1 AA accessibility audit on a design or page. An agent skill from markmead/hyperui.
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Guides easing, timing and animation choices for UI motion, based on a web animation course, and reviews existing animations in a before-and-after table.
Accessibility Fixer
ibelick/ui-skills
Audits and fixes HTML accessibility problems such as ARIA labels, keyboard navigation, focus management, contrast and form errors with minimal changes.
Wcag Audit Patterns
vmDeshpande/ai-agent-automation
Conduct WCAG 2.2 accessibility audits with automated testing, manual verification, and remediation guidance.
Baseline UI
ibelick/ui-skills
Applies a fixed set of UI rules for stack, components, interaction, animation, typography and layout, or reviews a file against them with concrete fixes.
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Related
Categories
Questions about Lang Attribute
What does Lang Attribute do?
A skill your agent uses when applies to all HTML documents. An agent skill from thedaviddias/Front-End-Checklist. Lang Attribute is an agent skill from thedaviddias/Front-End-Checklist. Use when applies to all HTML documents.
When should I use Lang Attribute?
Lang Attribute fits situations like: applies to all HTML documents; tasks that involve Accessibility.
How do I install Lang Attribute in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill lang-attribute -a claude-code`. Or copy the skill folder (skills/lang-attribute in thedaviddias/Front-End-Checklist) into .claude/skills/lang-attribute in your project. Claude Code loads it when a task matches its description.
How do I install Lang Attribute in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill lang-attribute -a codex`. Or copy the skill folder (skills/lang-attribute in thedaviddias/Front-End-Checklist) into .agents/skills/lang-attribute in your project. Codex loads it when a task matches its description.
Can I use Lang Attribute 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 lang-attribute -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/lang-attribute, .gemini/skills/lang-attribute, .github/skills/lang-attribute and .opencode/skills/lang-attribute in your project.
What does Lang Attribute need to run?
SKILL.md names no scripts, command-line tools or credentials: Lang Attribute is instructions for the agent only.
Does Lang Attribute 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 Lang Attribute 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 Lang Attribute use?
Lang Attribute 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 Lang Attribute use?
About 995 tokens (SKILL.md is roughly 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 Lang Attribute?
Skills that share tags, products or a category with Lang Attribute: 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, 9.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Lang Attribute?
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.