Question 1

How to integrate Critical with Webpack?

Accepted Answer

Use the html-critical-webpack-plugin mentioned in the README, which wraps Critical for Webpack builds. This allows you to generate and inline critical CSS as part of your bundle process without manual scripting.

Question 2

Critical vs Penthouse: which should I choose?

Accepted Answer

Critical is higher-level, automating style extraction and inlining from HTML, while Penthouse requires specifying CSS upfront. Choose Penthouse for dynamic styles or if Critical's automation isn't accurate enough, as suggested in the README.

Question 3

Can Critical handle CSS from React or Vue apps?

Accepted Answer

Yes, but only if the CSS is present in the final HTML output after build. For CSS-in-JS that injects styles at runtime, Critical may miss them, leading to incomplete extraction, so it's better suited for static or pre-rendered sites.

Question 4

How to ignore @font-face in critical CSS?

Accepted Answer

Use the 'ignore' option with 'atrule: ["@font-face"]' as shown in the README example. This defers font loading, preventing render-blocking while still extracting other critical styles.

Question 5

Does Critical improve Google Core Web Vitals?

Accepted Answer

Yes, by reducing render-blocking CSS, Critical directly optimizes metrics like First Contentful Paint and Largest Contentful Paint, which are key to Core Web Vitals. It's a recommended tool for performance tuning in static sites.

Question 6

How to set up Critical for different screen sizes?

Accepted Answer

Specify the 'dimensions' array in options with multiple height and width objects, as demonstrated in the multi-resolution support section. Critical will generate and minify CSS for each resolution, ensuring responsiveness.

Critical

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