Using icons on mobile devices for your website

You can get mobile devices to use a nice looking icon for your website when the link is placed on the home screen or a favorites page. The data is supplied through the mobile device in the form of a JSON file, containing information about the resolutions and devices you have made avaialble. The web app manifest is described here: https://www.w3.org/TR/appmanifest/ and at the time of writing isnt finalized yet (tho it seems to be used flawlessly by any recent android and ios device). Example file:

{
 "name": "App",
 "icons": [{
   "src": "/android-icon-36x36.png",
   "sizes": "36x36",
   "type": "image/png",
   "density": 0.75
  },
  {
   "src": "/android-icon-48x48.png",
   "sizes": "48x48",
   "type": "image/png",
   "density": 1.0
  },
  {
   "src": "/android-icon-72x72.png",
   "sizes": "72x72",
   "type": "image/png",
   "density": 1.5
  },
  {
   "src": "/android-icon-96x96.png",
   "sizes": "96x96",
   "type": "image/png",
   "density": 2.0
  },
  {
   "src": "/android-icon-144x144.png",
   "sizes": "144x144",
   "type": "image/png",
   "density": 3.0
  },
  {
   "src": "/android-icon-192x192.png",
   "sizes": "192x192",
   "type": "image/png",
   "density": 4.0
  }]
}