title: Issue with PWA on iOS 113
body: <p>I have a PWA that I've been using perfectly till I updated my phone to 11.3 (<em>introduce Service Workers supports, so in my iPhone it was only a bookmark</em>) and all worked like a charm.
  After I've updated to iOS 11.3 I wasn't able to enter to my app because I have an external login (in other domain) so each time I try to open my open this will open a safari browser to make the auth. Before PWA in iOS the external URLs were open in the same open (without open safari). Do you know if this is the correct behavior and, if it is ok, how can I fix it?</p>
  
  <p>Thanks! </p>