Schema Markup
alirezarezvani/claude-skills
When the user wants to implement, audit, or validate structured data (schema markup) on their website.
A skill your agent uses when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks.
MITAuto-check passed
Install Webp Format
$ npx skills add thedaviddias/Front-End-Checklist --skill webp-format -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webp-format --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/webp-format .claude/skills/webp-format && 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 "webp-format" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webp-format into .claude/skills/webp-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webp-format", 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/webp-formatType 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 webp-format -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webp-format --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/webp-format .agents/skills/webp-format && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "webp-format" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webp-format into .agents/skills/webp-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webp-format", 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 webp-format -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webp-format --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/webp-format .cursor/skills/webp-format && 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 "webp-format" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webp-format into .cursor/skills/webp-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webp-format", 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/webp-format--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 webp-format -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install thedaviddias/Front-End-Checklist webp-format --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/webp-format .gemini/skills/webp-format && 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 "webp-format" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webp-format into .gemini/skills/webp-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webp-format", 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 webp-formatInstalls 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 webp-format -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/webp-format .github/skills/webp-format && 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 "webp-format" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webp-format into .github/skills/webp-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webp-format", 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 webp-format -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 webp-format --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/webp-format .opencode/skills/webp-format && 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 "webp-format" agent skill from https://github.com/thedaviddias/Front-End-Checklist/tree/main/skills/webp-format into .opencode/skills/webp-format/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "webp-format", 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
webp-format- GitHub stars
- 74k
- Token cost
- ~385 tokens
- SKILL.md length
- 150 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 image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks.
- Reviewing image assets
- 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
- Build transforms related to Use WebP format with fallbacks
What it does
Webp Format is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
Its SKILL.md is about 390 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`).
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 image assets
- Build transforms related to Use WebP format with fallbacks
Example prompts
- “/webp-format”
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
Webp Format loads about 385 tokens when it runs, and up to ~1.6k if it reads all its reference files. Until then it costs about 53 tokens; SKILL.md has 150 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). 150 words, ~385 tokens.
Download SKILL.mdSave it as
.claude/skills/webp-format/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- webp-format
- description
- Use when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks. Check encoded size, rendered size, loading strategy, and above-the-fold impact together.
- metadata.category
- images
- metadata.priority
- high
- metadata.difficulty
- beginner
- metadata.estimatedTime
- 15
- metadata.source
- frontendchecklist.io
- metadata.url
- https://frontendchecklist.io/rules/images/webp-format
Use WebP format with fallbacks
WebP is smaller than JPEG and PNG at similar quality—using it reduces page weight by 25-35% for images, improving load times on all devices.
Quick Reference
- WebP provides 25-35% better compression than JPEG/PNG
- 97%+ browser support—nearly universal
- Use picture element for older browser fallbacks
- Supports transparency (like PNG) and animation (like GIF)
Check
Check if images are served in modern formats like WebP with fallbacks for older browsers.
Fix
Convert images to WebP format and implement proper fallback strategies.
Explain
Explain how WebP provides 25-35% better compression than JPEG and PNG.
Code Review
Review image assets, markup, and delivery configuration related to Use WebP format with fallbacks. Flag exact files or components where format choice, sizing, or loading behavior violates the rule, and describe how to confirm the fix in DevTools.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/images/webp-format
© 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/webp-format of thedaviddias/Front-End-Checklist.
- SKILL.md
- references/rule.md
Open the folder on GitHubat commit e8d14d0
Compare with similar skills
Webp Format 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 |
|---|---|---|---|---|---|---|
| Webp Format this skillthedaviddias/Front-End-Checklist | 74k | — | ~385 | Automated safety check: Pass | MIT | |
| Schema Markupalirezarezvani/claude-skills | 28k | 1 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Schema Markup Generatorsickn33/agentic-awesome-skills | 47k | 1 repos | ~2.1k | Automated safety check: Pass | MIT | |
| Remotion Markupremotion-dev/remotion | 63k | 2 repos | ~4.5k | Automated safety check: Pass | Custom licence | |
| Cdn Setupsickn33/agentic-awesome-skills | 47k | 2 repos | ~2.9k | Automated safety check: Pass | MIT | |
| Schema Markupmohitagw15856/pm-claude-skills | 1.4k | — | ~838 | Automated safety check: Pass | MIT |
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Cdn Setup
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Questions about Webp Format
What does Webp Format do?
A skill your agent uses when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks. Webp Format is an agent skill from thedaviddias/Front-End-Checklist. Use when reviewing image assets, markup, and CDN or build transforms related to Use WebP format with fallbacks.
When should I use Webp Format?
Webp Format fits situations like: reviewing image assets; build transforms related to Use WebP format with fallbacks.
How do I install Webp Format in Claude Code?
Run `npx skills add thedaviddias/Front-End-Checklist --skill webp-format -a claude-code`. Or copy the skill folder (skills/webp-format in thedaviddias/Front-End-Checklist) into .claude/skills/webp-format in your project. Claude Code loads it when a task matches its description.
How do I install Webp Format in Codex?
Run `npx skills add thedaviddias/Front-End-Checklist --skill webp-format -a codex`. Or copy the skill folder (skills/webp-format in thedaviddias/Front-End-Checklist) into .agents/skills/webp-format in your project. Codex loads it when a task matches its description.
Can I use Webp Format 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 webp-format -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/webp-format, .gemini/skills/webp-format, .github/skills/webp-format and .opencode/skills/webp-format in your project.
What does Webp Format need to run?
SKILL.md names no scripts, command-line tools or credentials: Webp Format is instructions for the agent only.
Does Webp Format 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 Webp Format 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 Webp Format use?
Webp Format 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 Webp Format use?
About 385 tokens (SKILL.md is roughly 1.5k 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 1.2k tokens, read only when the agent opens those files.
What are the alternatives to Webp Format?
Skills that share tags, products or a category with Webp Format: Schema Markup (alirezarezvani/claude-skills, 28k stars), Schema Markup Generator (sickn33/agentic-awesome-skills, 47k stars), Remotion Markup (remotion-dev/remotion, 63k stars) and Cdn Setup (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Webp Format?
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.