title: How does google show this special iOS advert?
body: <p>Hi all sorry if this is repost. I really searched but can't find anything on it.</p>
  
  <p>I always see this special ad when I use google services on my iphone or ipad. This little window animates out looking like a chat box. I can detect iOS device using user agent but how do I make the advert appear like google does? Specifically, try to open google maps. </p>
  
  <p>I would like to use a window like this when users use iOS device to access my website. It is the most elegant way to tell iOS user about your app while not annoying them with some roadblock each time you try to access with iOS device.</p>
  
  <p>Here is an image of what I'm talking about:</p>
  
  <p><img src="https://i.stack.imgur.com/yeJ6S.png" alt="image"></p>