SkillsAdd

thedaviddias/front-end-checklist

webp-format

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.

First seen Aug 11, 2026

Installation

$ npx skills add thedaviddias/front-end-checklist --skill webp-format
View on skills.sh ↗ GitHub repository ↗

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Also in this package

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npx skills add thedaviddias/front-end-checklist
frontend-checklist-global 96 color-contrast 22 animation-performance 22 https 19 pdf-size 18 word-count 18 image-optimization 18 cumulative-layout-shift 18 mobile-testing 18 quality 17

Browse all from thedaviddias/front-end-checklist

More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 74.1K
License MIT
Default branch main
Open issues 5
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

More metadata
category
images
priority
high
difficulty
beginner
estimatedTime
15
source
frontendchecklist.io
url
https://frontendchecklist.io/en/rules/images/webp-format

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 1,547 B
  • docs SUMMARY.md 219 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 6 installs

SKILL.md

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/en/rules/images/webp-format