title: Application lifecycle test when togging system menus: screen goes black when onvisibilityChange:hidden
body: <p>I am integrating youtube on cobalt 11. And now I'm testing the application lifecycle test.</p>
  
  <ol>
  <li>I send the <code>suspend</code> event when I push the menu button (youtube goes to background)</li>
  <li>I send the <code>unpause</code> event when I switch back to youtube. (youtube comes to foreground)</li>
  <li>I send the <code>deepLinke</code> event after the <code>unpause</code> event</li>
  </ol>
  
  <p>Sequence of events:</p>
  
  <ol>
  <li><code>window.onfocus</code></li>
  <li><code>window.onblur</code></li>
  <li><code>....................?launch=remote</code></li>
  <li><code>window.onfocus</code></li>
  <li><code>..................:visible</code></li>
  <li><code>onvisibilityChange:hidden</code></li>
  <li><code>window.onblur</code></li>
  <li><code>visible</code></li>
  </ol>
  
  <p>When <code>onvisibilityChange:hidden</code>, youtube goes to the background; is that right?
  This makes the screen turn black.</p>
  
  <p>And why 1. <code>window.onfocus</code> and 2. <code>window.onblur</code> occur again after youtube has already resumed?</p>