The following is a guest post by Wladston Ferreira Filho. We've covered critical CSS before, but the technique covered was specific to SCSS. Here Wladston covers the basics and introduces another way to do it, through PostCSS, and shows an example (with data) of the result.
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By
Ben Edwards
The following is a guest post by Ben Edwards. I saw Ben tweet about a simple Sass @mixin that allowed you designate bits of CSS as being "critical" - the idea being to load that critical CSS first and defer the loading of the rest of the CSS until later. A clever idea, and one that is getting very popular in the web performance crowd. I thought I'd get Ben to introduce these ideas in more detail for us.