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Inline critical CSS for faster rendering — measured AI agent skill | DecimalAI

thedaviddias/css-critical

SkillScore96Maintained

Use when reviewing stylesheets, component styles, and responsive behavior related to Inline critical CSS for faster rendering. Check the rendered layout across breakpoints and interaction states before proposing a fix.

by thedaviddias

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Frontend / UI pack

decimalai skills pull thedaviddias-css-critical

Get this skill — curl · raw file

curl -fsSL https://app.decimal.ai/s/thedaviddias-css-critical/SKILL.md

Raw file: /s/thedaviddias-css-critical/SKILL.md ↗ · machine-readable summary at /s/thedaviddias-css-critical.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

23 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 3d ago

Yes — +4% lift-3% tokens0% turns96% of whole cases pass with skill (22/23)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-01	✗→✓	▲ Improved	81%	0%
case-02	✗→✓	▲ Improved	13%	0%
case-23	✓→✗	▼ Worse	0%	0%
case-16	✓→✓	＝ Same ✓	-8%	0%
case-21	✓→✓	＝ Same ✓	-16%	0%

Showing 5 of 23 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

thedaviddias / front-end-checklist

skills/css-critical/SKILL.md

View on GitHub ↗

Imported 8/3/2026Version v1Bundled 1 file

Skill contents

references/

SKILL.md

Inline critical CSS for faster rendering

Critical CSS eliminates render-blocking resources, enabling browsers to paint content immediately—directly improving LCP and FCP scores.

Quick Reference

Inline ~14KB of critical above-the-fold CSS in <head>
Use tools: critical, critters, or Lighthouse to extract
Load remaining CSS asynchronously after page load
Automate in build process—don't manually maintain

Check

Analyze this page's CSS loading strategy to identify critical above-the-fold styles that should be inlined and non-critical styles that can be loaded asynchronously.

Fix

Extract and inline critical CSS for above-the-fold content, then load remaining CSS asynchronously to improve initial page render performance.

Explain

Explain how critical CSS improves Core Web Vitals by reducing render-blocking resources and enabling faster First Contentful Paint and Largest Contentful Paint.

Code Review

Review stylesheets, component styles, and responsive states related to Inline critical CSS for faster rendering. Flag exact selectors, declarations, or breakpoints that violate the rule in the rendered UI.

For full implementation details, code examples, and framework-specific guidance, see references/rule.md.

Rule page: https://frontendchecklist.io/en/rules/css/css-critical

Want to see if thedaviddias/css-critical would activate on your phrasing? Try it before you install — no LLM call, no signup.

Other measured skills in the registry, with their headline benchmark lift.