Pages will not render until the requested CSS is loaded. CSS is what defines how certain HTML portions of a website are to be displayed. What CSS is critical and why is some of it “not critical”?ĬSS stands for Cascading Style Sheets. This refers to CSS that will not be required to have the page render properly in the website visitor’s viewport. This is why pagespeed tools will often tell users to eliminate render-blocking CSS below the fold. Since all CSS is render-blocking, this means the page will appear much faster to the website visitor. To improve the loading speed of a website, only CSS that is required to load the viewable portion of a page should be loaded upon request. This is why optimizing the delivery of CSS is important to pagespeed and visitor experiences. The visitor will often see a white screen until the CSS stylesheets have been downloaded and parsed. Critical CSS is often referred to as the “critical CSS rendering path” which simply means all the necessary CSS code that is required to render the website in a browser to the website visitor.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |