The future of loading CSS - JakeArchibald.com →
The plan is for each
<link rel='stylesheet'>to block rendering of subsequent content while the stylesheet loads, but allow the rendering of content before it. The stylesheets load in parallel, but they apply in series. This makes<link rel='stylesheet'>behave similar to<script src='â¦'></script>.
Almost four years ago, Jake Archibald described how we could get progressive loading of CSS files by placing the references inside the <body> element.