What is Critical CSS?
Critical CSS is the minimum CSS required to render above-the-fold content. By inlining it directly in the HTML, you eliminate render-blocking stylesheet requests.
How to Implement Critical CSS
1
Generate Critical CSS
Use tools like Critical, Penthouse, or CriticalCSS to automatically extract above-the-fold styles.
2
Inline in HTML Head
Add extracted CSS in a <style> tag in the document head.
3
Load Full CSS Asynchronously
Use media='print' with onload to load the full stylesheet without blocking render.