title: HTML/CSS how to temporarily highlight a section of a page
body: <p>For example, if you go to this <a href="https://stackoverflow.com/questions/38060188/how-to-list-all-active-firebase-ci-tokens-or-revoke-them-all/38908695#38908695">link</a> it flashes the answer temporarily.</p>
  
  <p>How is this implemented?</p>
  
  <p>Is this some bootstrap/css thing?</p>
  
  <p>I tried googling, but I don't know what this flashing highlight functionality is called.</p>