manifest.json

Loop this in at a web page like so inside the head tag:

<link rel="manifest" href="manifest.json">

 
 

It is a file full of metadata about the page. An example might be:

{
   "name": "FunStuff",
   "short_name": "FunStuff",
   "theme_color": "#1976d2",
   "background_color": "#fafafa",
   "display": "standalone",
   "scope": "/",
   "start_url": "/",
   "icons": [
      {
         "src": "assets/icons/icon-72x72.png",
         "sizes": "72x72",
         "type": "image/png"
      },
      {
         "src": "assets/icons/icon-96x96.png",
         "sizes": "96x96",
         "type": "image/png"
      }
   ]
}