title: Standards for "Add to Home Screen"
body: <p>Are there any standards for browsers implementing "Add to Home Screen"? When this launcher for a web app is created, how should the app be launched? Is it going to be run in standalone web browser instance of a already running instance. </p>
  
  <p>I'm especially interested in the security/privacy of the apps. Do they share the same offline data (Cookies, local storage) as pages with the URL opened in a normal browser instance?</p>