title: Why don't I see the "Add to Homescreen" option on iOS 11.2
body: <p>I am testing the offline PWA features of a web app. Using the 9.3 simulator, I simply click the "share" button, then "Add to Homescreen".  </p>
  
  <p>Using the 11.2 simulator, there is no "Add to Homsecreen" button. What am I missing?</p>
  
  <p>Thanks,
  Wayne</p>