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Authoring Critical Above-the-Fold CSS

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.

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