Use when reviewing stylesheets, component styles, and responsive behavior related to Order CSS files correctly. Check the rendered layout across breakpoints and interaction states before proposing a fix.
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---
name: css-order
description: "Use when reviewing stylesheets, component styles, and responsive behavior related to Order CSS files correctly. Check the rendered layout across breakpoints and interaction states before proposing a fix."
metadata:
category: css
priority: medium
difficulty: beginner
estimatedTime: "10"
source: frontendchecklist.io
url: https://frontendchecklist.io/rules/css/css-order
---
# Order CSS files correctly
Incorrect CSS/JS order causes render-blocking delays and FOUC—users see unstyled content while waiting for styles to load.
## Quick Reference
- Load all CSS files before JavaScript in the document head
- Use async/defer for non-critical JavaScript
- Inline critical CSS for faster first paint
- Prevents FOUC (Flash of Unstyled Content)
## Check
Verify that all CSS files are loaded before JavaScript files in the document head to prevent render-blocking and ensure proper styling precedence.
## Fix
Reorganize head section to load all CSS files before JavaScript files, except for asynchronous scripts that don't block rendering.
## Explain
Explain why CSS should load before JavaScript to prevent FOUC (Flash of Unstyled Content) and ensure optimal rendering performance.
## Code Review
Review stylesheets, component styles, and responsive states related to Order CSS files correctly. 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/rules/css/css-order
