title: How does YouTube iOS app render the loading page?
body: <p>Just want to confirm, is the following gray section from YouTube iOS app just placeholder image? I saw a few apps make like this, if not, how do they implement that?</p>
  
  <p><a href="https://i.stack.imgur.com/e5P87.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/e5P87.png" alt="youtube-ios-loading-page"></a></p>