Question 1

How do I inline critical CSS in a React app?

Accepted Answer

Use isomorphic-style-loader for Webpack, which extracts critical CSS during server-side rendering and inlines it into HTML, as referenced in the inline sources section with React Starter Kit as an example.

Question 2

What's better for critical CSS: Penthouse or CriticalCSS?

Accepted Answer

Penthouse is a focused generator, while CriticalCSS outputs critical CSS; Critical (by Addy Osmani) builds on Penthouse to also handle inlining, making it more integrated for automated workflows.

Question 3

How to async load CSS after inlining critical styles?

Accepted Answer

Implement loadCSS to fetch non-critical stylesheets asynchronously after the initial render, as detailed in the async load CSS section, which includes research and usage examples.

Question 4

Does critical CSS work with single-page applications?

Accepted Answer

Yes, but it requires careful handling for dynamic routes; tools like Critical can be configured for SPAs, and isomorphic-style-loader aids in React apps, but frequent updates may be needed.

Question 5

How to integrate critical CSS with Webpack?

Accepted Answer

Leverage plugins listed in the build tool integration section or use modules like Critical with Webpack loaders, often requiring custom configuration in the build process.

Question 6

What are common mistakes when setting up critical CSS?

Accepted Answer

Errors include not updating critical CSS for content changes, incorrect viewport assumptions, and blocking non-critical CSS loading; use PageSpeed Insights tools from the directory to audit and fix issues.

Critical-Path Tools

What is Critical-Path Tools?

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