body: Scrolling about one day I noticed some text beneath the header of the YouTube page:
  
  
  [![screenshot described](https://i.stack.imgur.com/bbIqn.png)](https://i.stack.imgur.com/bbIqn.png)
  
  
  When I release the scroll, the underlay of the page returns to normal and the text is hidden once more.
  
  
  Are they legally required to do this, or is there some other reason for putting this text on the page? And, if it is required by law, how do they get away with hiding it as such?
  
  
  
title: Why does YouTube hide "Ad displayed" or "Ad can be skipped messages" under the header?