Technical SEO Wiki Entry

Critical CSS

Above-the-fold CSS extracted and inlined to accelerate first paint.

Critical CSS contains only the styles needed to render visible above-the-fold content. Inlining it in the HTML head allows immediate rendering while the full stylesheet loads asynchronously. The technique significantly improves First Contentful Paint and Largest Contentful Paint metrics on resource-rich pages.

Related Entries

Core Web Vitals

Google's page experience metrics measuring loading, interactivity and stability.

First Contentful Paint (FCP)

A performance metric measuring when the first DOM content renders on screen.

Render-Blocking Resources

Scripts and stylesheets that delay first paint until they finish loading.

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