When can I use a SFSafariViewController, WKWebView, or UIWebView with universal links? : <p>In the <a href="https://developer.apple.com/library/ios/documentation/General/Conceptual/AppSearch/UniversalLinks.html#//apple_ref/doc/uid/TP40016308-CH12-SW1" rel="noreferrer">Universal Links</a> section of the <a href="https://developer.apple.com/library/ios/documentation/General/Conceptual/AppSearch/index.html" rel="noreferrer">iOS App Search Programming Guide</a>, Apple says:</p>

<blockquote>
  <p>If you instantiate a SFSafariViewController, WKWebView, or UIWebView
  object to handle a universal link, iOS opens your website in Safari
  instead of opening your app. However, if the user taps a universal
  link from within an embedded SFSafariViewController, WKWebView, or
  UIWebView object, iOS opens your app.</p>
</blockquote>

<p>What does "handle a universal link" mean? Can I not ever open the given URL with an <code>SFSafariViewController</code>, <code>WKWebView</code>, or <code>UIWebView</code>? Does it only apply during <code>-[UIApplicationDelegate application:continueUserActivity:restorationHandler:]</code>, or is there a timeout in place? Does this mean we can't ever open the URL in a <code>SFSafariViewController</code>, <code>WKWebView</code>, or <code>UIWebView</code>?</p>
