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CSS File Load Order Checker

Reviews HTML head script and stylesheet order to reduce render-blocking and flash of unstyled content

Source Download skill
Repository
thedaviddias/Front-End-Checklist
Stars
74,632
Licence
MIT
Files
2 files

What it does

When installed, the agent reviews how a web page loads its CSS and JavaScript files and checks that stylesheets come before scripts in the document head. It then explains why this ordering prevents a brief flash of unstyled content and suggests fixes, such as moving files or marking non-critical scripts as async or defer. It works from written guidance rather than running tools, so it is a review aid rather than an automated tester.

Great for

  • Front-end developers tidying up a page's head section for faster first paint
  • Teams reviewing a web project against a front-end checklist before release
  • Beginners who want an explanation of why stylesheet and script order matters

Skip it if

  • Projects that need real performance measurement, since the skill gives advice without running browser or speed tests
  • Complex layout or responsive bugs beyond load order, which the skill only touches on in general terms

Try asking

  • “Review the script and stylesheet order in my index.html head and tell me what to change”
  • “Explain why my page flashes unstyled content on load and how to fix the order”
  • “Check whether any non-critical JavaScript in my head should be async or defer”
Step-by-step guide: how to use CSS File Load Order CheckerInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 2 original files, the MIT licence and an attribution note.

    css-order.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip css-order.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip css-order.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Paste the full head section of your HTML so the agent can check the actual order of tags.
  • Ask for the explanation as well as the fix if you are learning why the ordering matters.
  • Treat suggestions about async or defer as a starting point and test the page afterwards, since some scripts depend on order.

What's inside

  • references/rule.md
  • SKILL.md

Redistributed unmodified from thedaviddias/Front-End-Checklist under the MIT licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.