title: "progressive" web site loading
body: <p>I'm looking for a way to generate a kind of a "progressive" page loading effect that you can see when reloading for example Linkedin :</p>
  
  <p><a href="https://i.stack.imgur.com/ao8RS.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ao8RS.jpg" alt="enter image description here"></a></p>
  
  <p>It loads instantly, and is replaced by real content when it loads.
  I've seen it already on a lot of web sites, so I'm guessing there's a name for it and a right approach / js framework that does that :)</p>